| Names | |
|---|---|
| Preferred IUPAC name | Oxolan-2-one |
| Pronunciation | /ˌɡæmə ˌbjuːtɪroʊˈlæktoʊn/ |
| Identifiers | |
| CAS Number | 96-48-0 |
| Beilstein Reference | 635063 |
| ChEBI | CHEBI:42644 |
| ChEMBL | CHEMBL123 |
| ChemSpider | 5469 |
| DrugBank | DB04655 |
| ECHA InfoCard | 03-2119457557-33-0000 |
| EC Number | 203-510-6 |
| Gmelin Reference | 18459 |
| KEGG | C01754 |
| MeSH | D016620 |
| PubChem CID | 7362 |
| RTECS number | AU8400000 |
| UNII | 1D1QH5F94D |
| UN number | UN2810 |
| CompTox Dashboard (EPA) | 'DTXSID4020635' |
| Properties | |
| Chemical formula | C4H6O2 |
| Molar mass | 86.09 g/mol |
| Appearance | Colorless oily liquid |
| Odor | Mild, characteristic |
| Density | 1.129 g/mL at 25 °C |
| Solubility in water | Miscible |
| log P | -0.26 |
| Vapor pressure | 0.97 mmHg (20 °C) |
| Acidity (pKa) | pKa ≈ 4.4 |
| Basicity (pKb) | -0.38 |
| Magnetic susceptibility (χ) | -6.49×10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.434 |
| Viscosity | 1.7 mPa·s (25 °C) |
| Dipole moment | 2.30 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 233.5 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -533.0 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -2431.9 kJ/mol |
| Pharmacology | |
| ATC code | N01AX21 |
| Hazards | |
| GHS labelling | GHS02, GHS07 |
| Pictograms | GHS01,GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H315, H319, H336 |
| Precautionary statements | P210, P233, P240, P241, P242, P243, P280, P303+P361+P353, P305+P351+P338, P370+P378 |
| NFPA 704 (fire diamond) | 2-1-0 |
| Flash point | 98°C |
| Autoignition temperature | 446°C |
| Explosive limits | Explosive limits: 1.6–10.5% |
| Lethal dose or concentration | LD50 (oral, rat): 1540 mg/kg |
| LD50 (median dose) | 1540 mg/kg (rat, oral) |
| NIOSH | WSH40250 |
| PEL (Permissible) | Not established |
| REL (Recommended) | 55 mg/m³ |
| IDLH (Immediate danger) | 500 ppm |
| Section | Details |
|---|---|
| Product Name & IUPAC Name |
Product Name: γ-Butyrolactone IUPAC Name: Oxolan-2-one |
| Chemical Formula | C4H6O2 |
| Synonyms & Trade Names |
Synonyms: 1,4-Butanolide, Dihydro-2(3H)-furanone, 4-Butyrolactone Recognized trade or short names in the industry include GBL. |
| HS Code & Customs Classification |
HS Code: 2932.29 Customs classification can differ by destination due to local precursor controls or national implementation of chemical regulations. Manufacturers need to work closely with logistics compliance to ensure accurate declaration and anticipate any dual-use or restricted substance listings, as GBL is regulated in several jurisdictions. |
In the industrial production environment, the critical identifiers—CAS registry, chemical formula, HS Code—form the backbone for batch traceability, shipment documents, and regulatory communications. The process and purity grade dictate documentation handling at the production, QA, and logistics interfaces. For each new customer or jurisdiction, legal and compliance reviews determine if declarations require additional precursor tracking. Quality control teams maintain close review of how synonyms or trade names are referenced in internal systems to avoid mix-ups, especially for process batches destined for sectoral applications outside of bulk solvents, such as pharmaceuticals or electronics.
HS Code assignment ties back to molecular structure and end-use; for GBL, similarity to lactones means that, outside certain restrictions, goods move under chapter 29 for organic chemicals. Divergent customs codes in certain regions due to GBL’s potential for diversion trigger pre-shipment clearance audits. QA and logistics specialists regularly update import/export teams whenever changes to the global regulatory environment affect export classification, which supports unbroken compliance along the supply chain.
GBL is supplied as a clear, colorless liquid under ambient conditions. The substance gives off a mild, characteristic odor which intensifies above room temperature. Its melting and boiling points, as measured during production and batch release, can reflect subtle grade variances and may shift slightly based on trace impurity load. Boiling point determination is key for solvent specifications, and thermal response is routinely checked for process stability. Density is tracked throughout production to flag off-spec batches stemming from feedstock or process variation.
This lactone ring structure demonstrates marked stability in neutral and mildly acidic environments. Strong alkaline contact initiates ring-opening hydrolysis, generating downstream impurities. Handling guidelines must account for its potential to react with water under basic conditions, as well as with alcohols or amines, impacting storage and blending equipment selection.
GBL dissolves in water and a wide range of organic solvents. Solubility, although robust, can show grade-dependent haze or phase issues if batch impurity content approaches the solubility threshold for residues and byproducts. For formulation, users should pre-screen for grade compatibility if blends require optical clarity or ultra-low moisture content.
| Parameter | Industrial Grade | High Purity Grade | Application Sensitivity |
|---|---|---|---|
| Purity | Typical values depend on feedstock and purification process | More stringent, suited for electronic or pharmaceutical uses | Solvent and intermediate applications differ in specification |
| Moisture Content | Controlled to support storage stability | Lower limits for hydrolysis-sensitive applications | Affects formulation and product shelf life |
| Color (APHA) | Measured batchwise, higher color indicates impurity carryover | Tighter control for optical or polymer synthesis | Impacts suitability for polymer and electronics production |
Common sources of impurity include unreacted butanediol, residual catalysts, and hydrolysis products. Profile and acceptance limits tie directly to downstream application and route selection. Production lines track per-batch variance, trending shifts to pinpoint upstream process drift. Purification ensures removal of color bodies, trace metals, and volatile organics.
Key properties like purity, water content, and residual solvent are evaluated using validated GC, Karl Fischer titration, and colorimetric techniques. Test method selection hinges on customer and application standards, with pharmaceutical or electronics customers defining additional requirements. The final release standard is subject to internal quality control criteria and customer requirements.
Selection follows on-spec 1,4-butanediol or similarly pure precursors. Feedstock lot qualification includes monitoring content of catalyst poisons and byproduct formers. Sourcing prioritizes established partners able to meet trace and bulk impurity requirements.
Industrial processes employ controlled catalytic cyclization of 1,4-butanediol or dehydrogenation of butanediol streams. Route selection depends on raw material economics, required production scale, and impurity sensitivity. For purity-critical markets, investment in more selective routes justifies operating cost premium.
Temperature, catalyst loading, and reaction time serve as daily checkpoints. Deviation prompts intermediate testing for over-reaction markers or unreacted convertibles. Distillation and filtration protocols are customized by batch and impurity content, with secondary treatments deployed if color, odor, or certain trace organics trend above internal limits.
All finished lots undergo GC profiling, water content assay, color scoring, and occasionally metal screen. Products not conforming to specification standards are recirculated or downgraded. Batch consistency relies on controlling input quality and rigorous in-process control.
GBL functions as a strong electrophile and finds use in ring-opening with nucleophiles, contributing to the synthesis of pyrrolidones, solvents, or specialty intermediates. Reactivity shifts with solvent polarity and catalyst selection. High temperature or alkaline conditions accelerate hydrolysis or aminolysis, requiring dedicated reactors or neutralizing procedures.
Catalyst load, batch residence time, and solution composition determine both selectivity for the desired product and suppression of undesired byproducts. Conditions are established per customer project, and post-reaction processing includes neutralization and extraction to support high-purity outcomes.
Main derivative streams include N-methylpyrrolidone and other lactams. Conversion ability and impurity risk map directly to initial GBL batch quality; contamination in upstream product propagates to derivatives unless managed by intermediate purification steps.
GBL is housed in sealed, inert-lined drums or totes to prevent water uptake and contact with strong bases or oxidizing agents. Storage areas regulate temperature and humidity, with extended exposure to light and air minimized due to risk of slow degradation or container contamination. Batches sensitive to moisture require desiccant or nitrogen-blanketed storage.
Preferred containers are stainless steel or high-grade polymer proven against hydrolysis and absorption. Incompatibility with polycarbonate or low-grade metals can lead to leaching or color shifts.
Unopened product, under recommended conditions, retains quality for periods defined by customer needs and regulatory guidance. Quality teams routinely monitor samples, watching for color development, odor change, or unexpected water accumulation as signals of degradation or contamination.
GBL appears on regulatory lists for hazardous substances. Details on classification and labeling requirements follow the latest global harmonization standards applicable in the region of production or sale.
Skin, eye, and respiratory irritation are recognized during manufacturing and transfer operations. Strict containment and personal protective equipment are prioritized for production staff. Drip trays, eyewash stations, and mechanical venting serve as secondary controls.
Available safety data highlight acute exposure risks, including reversible CNS effects at sufficient dose. Quality and safety departments conduct periodic air and surface monitoring in bulk storage and transfer areas; internal exposure action limits align with prevailing occupational health standards. Spill containment and emergency handling protocols are trained at all plant sites, recognizing product handling as subject to external regulatory inspection and audit.
γ-Butyrolactone is manufactured through two primary industrial routes: dehydrogenation of 1,4-butanediol (BDO) and hydrogenation of maleic anhydride. Plant production capacity depends on reactor throughput, feedstock availability, and purification system loading. Typical operating rates fluctuate in response to plant turnarounds, energy supply, and raw material market interruption. Contract volumes and spot availability change with downstream seasonality—major users such as agrochemical, polymer, and battery electrolyte sectors sometimes require prioritized scheduling or force adjustments to campaign length.
Inventory fluctuations arise from raw material supply chain shocks, shipping bottlenecks, or government-imposed safety stock requirements. Domestic producers can usually provide stable allocation outside of extreme events but need raw material allocation discipline during high volatility periods.
Standard lead times for GBL delivery from manufacturing facility to end customer depend on geographic region, mode of transport, and packaging configuration. For domestic bulk orders with package sizes above 1,000 kg, the shortest fulfillment cycle matches batch release frequency—typically four to seven calendar days after product clearance, pending regulatory documentation and freight slot. For export shipments requiring ocean freight, total lead time frequently doubles to account for inland haulage and customs clearance. Minimum order quantity correlates to packaging—drum/IBC lots usually start at a single pallet, while tank shipments involve higher MOQs associated with economical freight utilization.
Packaging selection for GBL considers regulatory requirements, chemical compatibility, and customer formulation workflows. Standard configurations include steel or HDPE drums, IBCs, and dedicated tank trucks or ISO-tank containers. For high-purity, battery-grade or electronic-grade orders, packaging receives additional pre-cleaning and rigorous closure testing. For export, all primary containment must meet UN dangerous goods standards; regional variations in container materials or closure method are addressed via consultation and pre-shipment inspection.
GBL classifies as a regulated substance for both transport and end-use in many jurisdictions, requiring full DG-compliant documentation and often dual-use end-user declarations. Shipping is organized under FCA or FOB terms by default, with DAP available subject to destination country risk acceptance and documentary readiness. Payment terms, including L/C, T/T, or deferred invoice, depend on buyer risk profile and order size; long-term contract customers may request rolling credit terms after relationship development and compliance audit.
GBL direct manufacturing cost hinges on the price of upstream feedstocks—mainly 1,4-butanediol and maleic anhydride. These intermediate costs track international petrochemical and specialty chemical market trends, responding to naphtha, natural gas, and refinery operation patterns. Sudden spikes often map to outages in upstream butadiene or utilities, especially in East Asia where production is concentrated.
Substantial cost differences between grades emerge from required purification steps—high-purity forms, with water and metal impurity limits controlled down to ppm or ppb level, demand repeated distillation or chromatography, raising yield loss and energy intensity. Regulatory costs add to the landed price: certain regions require multi-stage documentation, licensing, or chain-of-custody audits depending on final use.
End-use sector dictates grade requirement: industrial-grade GBL tolerates higher impurity levels for polymerization and solvents, while battery and electronic use cases require extremely stringent specifications for trace metals, solvents, and other potential interfering contaminants. End-user audit trails often determine whether lots can be qualified for electronics or battery electrolyte use, further segmenting pricing into distinct tiers for otherwise similar chemical purity.
Final packaging and transport compliance add further price differentiation—UN-certified packaging with tamper-evident seals and serialized lot tracking increase per-unit cost relative to in-house transfer for captive users.
GBL manufacturing capacity remains concentrated in China, Western Europe, and the US, with intermittent expansions in India and Southeast Asia targeting local demand growth. Demand elasticity links closely to downstream value chains—especially battery electrolytes, pharmaceuticals, and agrochemicals. Capacity utilization tends to cycle with new battery production line commissioning or major plant maintenance periods. Supply shocks propagate quickly due to the concentration of large single-site producers.
In North America, smaller number of sites with integrated BDO-GBL routes moderate short-term price swings, with domestic buyers frequently placing annual offtake contracts. EU manufacturers face additional compliance and permitting costs, creating higher baseline pricing but sometimes greater consistency for specialty grades. Japan emphasizes high-end electronic grades, with price premiums for certified lots. India’s supply base still relies on imports for certain high-purity applications. China dominates global volume and price formation, with export prices sensitive to local demand, energy policy shifts, and shifting export regulations.
GBL prices in 2026 will react to two primary trends: electrification growth in Asia’s battery segment and ongoing regulatory tightening around precursor management in the Americas and Europe. Increased environmental and safety standards, together with evolving non-traditional demand in high-purity applications, are expected to pull average prices higher than historical norms, despite periodic raw material softening. Barring extreme global recession or major supply disruption, price scenarios suggest continued cost differentiation along grade and compliance lines, with specialty and packaging-certified lots showing greater resilience to downturn pressures.
Forecast is based on plant-level production data, demand signals from major battery and solvent manufacturers, and trade association contract settlement trends. Regulatory change tracking, energy index monitoring, and quarterly raw material settlement prices are also considered. Supply chain surveys inform assumptions on lead-time and MOQ trends by region.
Capacity additions in China and India fueled competition in industrial grades, pushing some spot market prices lower in early 2024 before stabilizing on renewed battery sector requirements. Major converters in North America and the EU pushed for traceability and anti-diversion measures, leading several global suppliers to tighten audit requirements or restrict open-market sales.
Multiple jurisdictions updated precursor control regulations in late 2023 through mid-2024, raising import/export permit complexity and documentation cost. The EU REACH regulation review flagged several high-volume solvents, including GBL, for closer compliance review, impacting both domestic producers and importers. US DEA continued heightened scrutiny of downstream buyers, requiring robust chain-of-custody measures and more frequent end-user audits.
Manufacturers expanded customer eligibility screening, prioritized long-term contract fulfillment, and invested in in-line monitoring for trace impurity control—especially for high-purity sectors. Many plants increased physical and digital traceability of outgoing shipments to align with global anti-diversion frameworks. Technical service teams now engage earlier with end users on batch-to-batch documentation and on-demand COA support to minimize downstream regulatory delay.
γ-Butyrolactone (GBL) moves between different sectors mainly as a solvent, intermediate, and auxiliary reagent. Its key usage scenarios span electronics, polymers, agrochemicals, pharmaceuticals, and surface treatment. We see GBL supporting precision cleaning in microelectronics fabrication when purity constraints reach the parts-per-million level. In pharmaceutical synthesis, its typical application centers on API (Active Pharmaceutical Ingredient) precursor production where batch integrity and trace contamination resilience carry distinct weight. For agrochemicals, GBL appears in select herbicide and pesticide formulations, where both the stability of product and compliance with local regulations must be considered. On the polymers side, GBL functions as a monomer or ring-opening agent, commonly controlled for molecular weight management and downstream conversion yield.
| Sector | Typical Grade | Key Technical Priorities |
|---|---|---|
| Electronics | Electronic Grade, High Purity | Trace metals, moisture, organic residue levels |
| Pharmaceutical | Pharma or API Intermediate Grade | Organic impurities, contaminant profile, batch traceability |
| Agrochemicals | Technical Grade | Pesticide-relevant impurity control, regulatory documentation |
| Polymer/Resin | Industrial Grade | Water content, color control, storage stability |
| Surface Treatment | Technical Grade, Custom Cut | Solvent power, volatility, compatibility with cleaning agents |
Sectors impose their own order of constraint on GBL grade. For semiconductor or display fabrication, the metals content is tracked with high rigor; even single-digit parts per billion deviation can disrupt yield. Pharmaceutical makers demand well-controlled low-level organics and complete impurity profiles validated per ICH requirements, especially where final drug substance safety is involved. Agrochemical blending may accept broader impurity envelopes but asks for reliable documentation and supply consistency so final products meet regional regulatory thresholds. In resin or polymer use, moisture and color are more closely tracked; water pickup during storage relates closely to batch-to-batch polymerization behavior. Surface cleaning customers evaluate solvent power and evaporation rate in relation to the specific residues encountered in their lines.
Clarify the final use of GBL: is it entering pharmaceutical synthesis, feeding into a semiconductor fab, or augmenting an agrochemical blend? The end use immediately frames which parameters will dominate the grade selection process.
Check the compliance landscape: REACH in Europe, TSCA in North America, PMDA for Japanese pharmacopeia, or local agricultural substance controls. Regulatory grade alignment supersedes technical preference in tightly controlled industries. Regulatory support documentation and batch history records drive grade eligibility.
Assess the application’s sensitivity to typical GBL impurities: water, gamma-hydroxybutyric acid, aldehydes, residual solvents, and trace metals. The process route (petrochemical, renewable, or custom synthesis) can shift impurity signature. Electronic and pharma grades undergo tighter purification, added filtration, and metal scavenging steps. Standard technical grades follow a different control regime and may admit slightly wider impurity ranges.
The target volume determines feasible grade segmentation. For high-throughput blending, industrial or technical grades often prove more cost-flexible, provided application tolerance holds. Specialty pharma or electronics use cases may only justify high-purity grades for limited, high-value lots. Bulk buyers frequently structure supply around annual contracts aligned to demand cycles.
No paper specification replaces real-world validation. Customers should evaluate representative batches in their process. Purity, batch reproducibility, and downstream compatibility inform the final selection. Manufacturer support teams can align sample set selection based on prior customer feedback and in-process test results, ensuring fitness-for-use at the required scale.
In the industrial production of γ-Butyrolactone, rigorous quality practices form the base of all operations. Certification under internationally recognized quality management systems such as ISO 9001 provides an objective mechanism for documenting process control, traceability throughout the production lifecycle, and improvement tracking. The implementation of this system involves documented raw material qualification, intermediate control points, and verification of finished batch properties against release criteria.
For end users, these certifications mean manufacturing traceability is fully auditable from supplier selection through final packaging. Each batch is subject to statistical sampling aligned with both internal and external audit requirements. Certification does not mean the absence of batch variability, but continuous effort to maintain consistent product quality within customer-defined tolerances.
γ-Butyrolactone may require dedicated product certificates depending on the industry and application territory. Pharmaceutical or food-contact grades demand full compliance with standards such as GMP or specific monographs, which necessitate additional validation protocols for impurity profiles, residual solvent levels, and packaging sterility. For electronics or specialty polymers, lower water content and reduced trace metals must be demonstrated in the final certificate of analysis.
The level of certification adapts to customer application—requirements for pharmaceutical intermediates differ significantly from requirements for industrial solvents or polymer raw materials. Dedicated documentation is provided based on contract and target use.
Complete batch documentation includes certificates of analysis, traceability documentation for all major starting materials, and supply chain statements of origin. Lot-specific reports typically show analytical results for moisture, purity (as established by GC or HPLC), and select impurity markers as specified by customer or regulatory needs. These records help address customer audits, regulatory submissions, and procurement due diligence.
Routine annual regulatory inspections and regular participation in supplier evaluation programs form a continuous cycle of documentation improvement. Should customers require process declarations, these can detail synthetic route, purification stages, and risk mitigation practices for specific regulated attributes.
Sustained production capacity for γ-Butyrolactone comes from backward integration to key starting materials, as well as long-term partnerships with utility providers and logistics operators. This approach allows forward planning for regular repeat orders, spot purchases, and scaled supply for project ramp-up without process bottlenecks.
The cooperation framework is driven by forecast-based, pull-based, or consignment-style agreements depending on partner demand volatility and regional logistics constraints. Bulk and packaged supply lines can be configured per the customer’s site storage and feedstock workflows, which helps maintain operational uptime and reduces batch-to-batch transfer risk.
The main plant operates continuous or batch production trains, with capacity contingent on aggregate demand and raw material availability. Core supply reliability depends on continuous process monitoring, buffer stock, and predictive maintenance of critical equipment. Customers operating in regulated sectors benefit from supply assurance clauses and business continuity plans in the event of upstream disruptions.
Contracts may specify delivery from single or multiple qualified plants to mitigate geographic risk and satisfy regional compliance differences. Detailed monthly and quarterly output forecasts are shared with contracted buyers to facilitate their inventory planning.
Sample requests are handled through an internal allocation procedure, assigning research, specialty, or pre-commercial trial quantities according to application. To reduce cross-contamination and ensure product comparability, samples originate from production lots intended for bulk supply under the relevant grade.
Customers submit intended use, purity range requirements, and analytical parameter needs. Outbound samples ship with a representative certificate of analysis covering the primary batch release properties and typical impurity spectrum found in that scale or production mode.
Procurement relationships can follow annual contract, quarterly allocation, or spot supply modes. With fluctuating demand patterns from downstream chemical, pharmaceutical, or material science sectors, flexible production campaigns allow timely switchovers between standard technical grade, electronic grade, or premium grades without excessive plant downtime.
For large-volume users, on-site tank leasing or vendor-managed inventory integrates manufacturer output scheduling with the customer’s demand chain. Smaller or project-based users benefit from smaller lot shipments and pooled batch production runs, reducing minimum order quantity barriers. Flexibility also covers payment terms, regulatory documentation support, and logistics handover options, so customers can align procurement models to their operational structure.
Technical departments continue to focus on routes that allow more efficient purification and impurity management, especially for grades used in pharmaceuticals, electronics, and specialty polymers. Selection of base feedstock remains critical; quality of maleic anhydride and butanediol determines the downstream impurity profile. Recent investments in continuous process design allow tighter control ranges for water and heavy end contaminants, which directly impact oxide content and hydrolysis risk in sensitive applications. Pilot studies currently concentrate on conversion processes that enable lower by-product formation, aiming to support more stringent customer acceptance thresholds.
Requests for material-specific support originate from companies pursuing new electrolytes for lithium-ion batteries, as well as from users reformulating solvents for greener coatings. Grades tailored for the electronics sector require additional purification rounds; electronic applications show increased sensitivity to trace acid and metal content, as these influence device reliability. Agrochemical demand for GBL tracks the shift to greener carriers; customers seek reassurance on potential for residual biologically active impurities and clarification on shelf stability under field storage scenarios. Internal assessment teams frequently review formulation feedback from these sectors to refine both QA/QC and R&D priorities.
On the technical side, controlling γ-Butyrolactone ring-opening reactions during storage and transport has become a top focus, especially for distributors requiring re-packaging or long-haul delivery. Engineers have noted variability in reactivity based on drum material, seal type, and exposure cycles. R&D advances now include compatibility testing of all common storage media prior to sale. The team has documented that trace moisture exacerbates ring-opening side reactions, prompting upgrades to drying and inertization steps post-purification. Significant progress has occurred in upscaling catalytic hydrogenation routes; pilot reactors demonstrate lower off-gas load and improved recycle efficiencies, directly reducing batch-to-batch variation.
Over the next three to five years, γ-Butyrolactone demand will continue adjusting to shifts in battery and pharmaceutical manufacturing. Large-scale users are moving toward locked-supply agreements, placing greater requirements on production consistency, traceability, and documented origin of raw materials. Local regulatory trends in Asia and Europe are resulting in additional auditing and declared-content requirements, which influence both in-process analytics and certificate documentation practices.
Production technology incrementally shifts toward lower-energy, higher-yield routes with expanded on-line quality monitoring. The deployment of process analytical technology (PAT) assists with real-time management of key impurity families—especially aldehydes and water. Debottlenecking projects emphasize solvent recovery and closed-loop waste reduction strategies without compromising purity for demanding customers. Evolution also touches raw material qualification, with more forward integration into upstream sectors to secure feedstock homogeneity.
Pressure from downstream buyers, especially in pharmaceuticals and fine chemicals, drives incorporation of greener process aids and closed-system solvent capture. Technicians and product managers attend cross-industry consortiums focused on lifecycle analysis and circular use pathways for both main product and still bottoms. Selection of energy sources and catalyst recycling processes continues to receive internal investment. Non-incineration waste valorization approaches remain in long-term investigation to reduce process carbon footprints.
Direct technical consultation is provided by engineering and production support teams, drawing on detailed batch history and process qualification data. Customer requests frequently relate to compatibility checks for novel solvents, batch troubleshooting (odor, color, moisture pickup), and tailored advice on process integration. Consistency and root cause analysis for off-tests are standard post-sale services, drawing from archived in-process and final QC data.
Application support addresses formulation stability, reaction efficiency, and downstream performance. Specialists assist in design-of-experiment studies for customers scaling up new formulations. Close collaboration with R&D ensures feedback from application performance ties back into the process optimization loop. Recommendations provided for pre-conditioning, blending strategies, and storage protocols depend on grade and end-use sensitivity, which can range from bulk commodity to high-purity specialty uses.
Commitment to prompt investigation of any reported issues in the field remains a core responsibility. Traceability of every delivery, including raw material lot origin and process batch identifiers, is built into shipment documents and retained in internal systems for rapid response. Policy aligns with both regulatory reporting and industry best practices for complaint handling, with outcomes routing back to process improvement planning and customer communication. Documentation packages standardly include technical specifications, recommended storage protocols backed by real-world temperature and container trials, and application cautions for sensitive clients.
Our factory manufactures γ-Butyrolactone (GBL) in bulk quantities for use in demanding industrial environments. We operate a full-scale production facility with automated hydrogenation technology, closed-loop containment, and analytic equipment calibrated for each batch. Through every run, our team monitors pressure, temperature, and purity, ensuring GBL output exceeds established thresholds for water content and color.
GBL serves as a critical intermediate for pyrrolidone synthesis, pharmaceuticals, agrochemicals, and specialty polymers. Its solvency, reactivity, and compatibility make it valuable for capacitor electrolytes, paint removers, and electronic cleaning solutions. GBL’s stable physical properties give process engineers and formulators a consistent input in reaction pathways and downstream blending.
Internal quality protocols drive our batch certification and release process. Each lot undergoes gas chromatography, titration for moisture, and assessment for residue content. Our laboratory confirms every delivery meets the requested assay, color, and impurity profile. We have long maintained strict isolation in raw material sourcing, so trace contamination remains minimized. Year over year, our process adjustments follow customer feedback and regulatory audits, resulting in ongoing refinement of both purity and control documentation.
We operate full drum, IBC, and tank packaging lines, all cleaned between runs to prevent mix-ups. Dedicated filling lines avoid cross-material interference. Our logistics team manages large-volume shipping into global chemical hubs and regional plants. Standard package sizes meet most customer plant handling systems, but we also design custom packout to integrate with industrial transfer points and bulk storage units.
Buyers, plant engineers, and process development teams receive technical support from our plant chemists. We assist with material compatibility reviews, storage recommendations, and inputs on regulatory compliance during transport and handling. Our product stewardship extends from choose-the-right-grade guidance to practical troubleshooting for line changes or new project launches. We retain records of every historical production lot, making retrospective inquiries about material data or performance possible.
Plant operations and procurement teams benefit from predictable batch-to-batch performance, streamlined documentation, and ready access to source-level technical expertise. We maintain large raw material reserves and flexible scheduling, minimizing risk of unplanned supply interruptions. As a direct producer, we eliminate intermediary dependencies and ensure commercial buyers receive direct support throughout order, delivery, and beyond. Our clients often cite reliability, accountability, and transparent specification control as decisive factors in maintaining long-term industrial supply contracts for GBL.
γ-Butyrolactone, commonly known as GBL, plays a significant role in multiple industries, including electronics, agrochemicals, and pharmaceuticals. As a direct manufacturer, we approach the production with precise control over each analytical parameter to meet the growing quality expectations and safety standards in these sectors.
Industrial applications place a strong emphasis on GBL purity. Many electronic solvents and specialty chemical syntheses operate on narrow margins where impurities trigger downstream problems: unwanted side reactions, fouling of equipment, or diminished product yield. From our experience, impurities like water, gamma-butyric acid, and residual solvents must be controlled to trace levels. In our standard production batches, we rigorously monitor and document each lot’s purity using gas chromatography. Typical purity for industrial-grade GBL sits above 99.5%. Under certain circumstances—such as contract manufacturing for pharmaceutical intermediates—we can routinely achieve and certify grades up to 99.9% by weight.
Reactivity, stability, and solubility are frequently discussed among our technical team. GBL, a hygroscopic cyclic ester, requires closed-system handling from distillation through to packaging. While its moderate boiling point (about 204°C) enables distillation under vacuum, its hydrophilicity demands careful exclusion of water during storage and transport. Failure to do so results in hydrolysis, producing gamma-hydroxybutyric acid. For this reason, our packaging utilizes high-purity nitrogen purging to minimize moisture ingress.
Density, refractive index, and water content remain among the most referenced technical data in our internal specifications. Karl Fischer titration provides direct assessment of water levels; we routinely target water contents below 0.05% for most industrial clients. This degree of dryness supports GBL’s effectiveness as an aprotic solvent in polymerization, where even small traces of water influence reaction pathways.
Unintended side-products from ring-opening polymerization, residual reactants, or metal traces introduce meaningful risks in high-purity applications. Our synthesis utilizes controlled raw materials and process steps to minimize these artifacts. Each production stage incorporates in-line and offline analytics to screen for botanical and environmental contaminants. Such vigilance is a direct response to requests from clients in performance coatings and lithium battery manufacturing, where reliability rests on the molecular integrity of every shipment. We record certificate of analysis data for every shipment, and welcome customer audits as part of our ongoing quality assurance.
Regulatory guidelines affecting GBL, particularly its use as a controlled substance in some regions, drive us to implement robust lot traceability and documentation. We maintain full transparency regarding the source and quality controls for every kilogram produced. For clients operating under strict environmental, health, and safety protocols, we tailor manufacturing and analytical standards to dovetail with local and international regulations. Our R&D and compliance team works closely with strategic partners to integrate evolving purity benchmarks—be it from global testing laboratories or emerging industry guidance.
Feedback from our industrial partners consistently shapes our approach to manufacturing GBL. Issues such as container compatibility, long-term storage stability, or new requirements for analytical reporting are addressed through direct collaboration. Our technical team remains available to answer questions down to specific impurity profiles, and we can provide detailed certificates for each lot upon request. Direct lines of communication between our plant, laboratory, and customers mean we not only meet today’s purity needs, but also anticipate challenges in tomorrow’s industrial landscape.
Any large-scale production of γ-Butyrolactone demands consistent investment in raw materials and process management. Our minimum order quantity for bulk packaging is set based on our direct production scale and quality assurance routines. We maintain an MOQ of 200 kilograms for standard orders. This threshold allows us to operate our reactors efficiently, keep inventories fresh, and maintain predictable scheduling across production lines.
Small-quantity requests introduce risk and extra handling. By setting our MOQ at 200 kilograms, we ensure the cost of synthesis, purification, and quality testing aligns with direct manufacturer economics. Research and development teams or smaller-scale ventures seeking pilot batches can discuss options with our technical staff, but for commercial and industrial users, the MOQ is not flexible. This approach keeps batch purity and product integrity uncompromised while supporting safer chemical stewardship.
Manufacturing GBL involves several controlled steps: sourcing high-grade raw inputs, carrying out batch reactions, purification, finished product storage, and then packaging. A standard production cycle for a bulk order typically requires seven to ten working days from the confirmation of payment and order details.
Our lead time includes rigorous quality assurance. Every batch gets tested for purity, moisture, and key contaminants. Tight supply chain controls minimize downtime — base chemicals are stocked, reactors are reserved for consecutive scheduling, and packaging material requirements are forecasted ahead of peak demand seasons. During periods of high order volume or regulatory reviews, additional days may be necessary, but we notify buyers as soon as scheduling adjusts.
As the direct producer, we see daily how realistic expectations on MOQ and lead time protect both ends of the supply chain. Our plant processes generate efficiency only above a certain scale, allowing us to supply consistently high-purity GBL to industrial users — whether their focus is on polymers, pharmaceuticals, or specialty chemicals. Lowering MOQ impacts batch scheduling and can compromise quality if improperly managed.
Lead time communicates more than a shipment date. It signals that every process — from solvent purification to analytical checks — follows protocols shaped by decades in the specialty chemical sector. Rush orders stretch production resources and could introduce lapses. We recommend that procurement managers plan with our stated lead times in mind, accounting for periods of regulatory review or customs checks in their own import planning.
We invest continuously in automation, operator training, and supply partnerships so that both MOQ and lead times stay predictable. Every order reflects forward planning: raw input contracts, scheduled production, and on-site storage capacity. Where possible, our logistics team organizes batch production runs to align with global shipping lanes and customer delivery windows. This minimizes warehouse lag and demurrage costs for bulk users.
Bulk procurement of GBL succeeds on dependable factory-level commitments. Setting clear MOQs and open lead-time guidance keeps process safety, product quality, and commercial reliability at the center of supply chain decisions. Our direct production experience guides every order, delivering consistent results for our industrial partners worldwide.
γ-Butyrolactone (GBL) sits among those chemical compounds that regularly draw close regulatory attention worldwide. As a direct manufacturer of GBL, we navigate the compliance frameworks set by governments and international authorities every day. Our own shipments, both outgoing and incoming, reflect the evolving expectations of authorities in each region. Experience has taught us the importance of staying in sync with current regulations—not only to avoid legal risk but also to foster trust across our customer base.
GBL has long been classified as a List 1 chemical or controlled precursor in the European Union, United States, and many Asian countries. Authorities view GBL as a precursor for substances that appear on restricted schedules due to concerns about diversion for illicit use. Each territory enforces its own set of strict requirements. For example, in the EU, GBL sits under Regulation (EC) No 273/2004 and 111/2005, calling for end-use declarations, import/export licenses, and notifications to local control authorities. U.S. regulations, as set by the Drug Enforcement Administration, forbid unauthorized sales and require transaction records that authorities may review at any time.
From a manufacturer’s perspective, documentation forms the backbone of lawful trade. For legal export, our standard procedure includes compiling a full Material Safety Data Sheet (MSDS), a Certificate of Analysis (COA), and mandatory shipping labels including correct UN numbers and hazard classifications. Regulators often request import/export permits, specific to each shipment, reflecting the downstream customer and intended application.
We require our customers to provide official end-user certificates before shipment leaves our factory. These documents detail the intended use of GBL, the purchasing company's location, the responsible personnel, and, where necessary, national government endorsements. In some cases, authorities perform on-site audits to verify the legitimacy of the documents. This is not a formality—last year, at least three shipments underwent secondary inspection at European customs based on new documentary requirements.
Our technical team maintains ongoing communication with export control offices in the regions we serve. When regulatory changes arise, such as recent amendments on reporting thresholds or notification timelines, we adapt internal workflows and update our recordkeeping practices. This means our compliance documentation is ready for immediate audit, whether from customs inspection or a regulatory authority. Our experience has shown that maintaining open records, transaction logs, and up-to-date registration certificates eliminates bottlenecks at ports and reduces the risk of shipment delays or penalties.
Misclassification or incomplete paperwork leads to fines, seizures, and even bans. We always verify that our declarations, packing lists, and container seals reach the strictest interpretation of local requirements. Our export control office issues regular compliance bulletins to our operations and sales teams, ensuring upcoming shipments meet all legal definitions—be it for research, industrial, or pharmaceutical use.
We encourage any company planning to import or export GBL to consult recent regulations directly and work closely with compliance at the manufacturing level. As legislation evolves, refining processes, boosting traceability, and ensuring every shipment matches current regulatory standards create sustainable partnerships and clear passage through the legal and commercial landscape.
For product inquiries, sample requests, quotations or after-sales support, please feel free to contact me directly via sales9@bouling-chem.com, +8615651039172 or WhatsApp: +8615651039172
