Gamma-Butyrolactone (GBL) Storage & Tank Compatibility
Storing Gamma-Butyrolactone (GBL)? Start Here
Gamma-butyrolactone (GBL), the simplest five-membered lactone, is a colorless, water-miscible liquid with the formula C4H6O2 and a molecular weight of 86.09. As a high-boiling, low-volatility polar aprotic solvent it dissolves a wide range of polymers, resins and salts, which makes it valuable for coatings, agrochemical formulation, electronic-grade cleaning and battery-electrolyte chemistry. That same dissolving power is exactly why it cannot be stored in polyethylene. GBL belongs to the lactone / ester-ketone solvent family, and like acetone, MEK and N-methylpyrrolidone it permeates, swells and environmentally stress-cracks HDPE and crosslinked polyethylene. It also hydrolyzes slowly in the presence of water toward 4-hydroxybutyric acid, so wet conditions raise the corrosion risk for bare steel. For bulk service, stainless steel and fluoropolymer-lined systems are the correct answer.
Can You Store Gamma-Butyrolactone in a Polyethylene Tank?
No. Gamma-butyrolactone is a strong polar aprotic solvent, chemically a cyclic ester (lactone). Standard polyethylene resistance data rates polyethylene as unsuitable for ketones and aggressive esters because these solvents are absorbed into the polymer, causing swelling, loss of stiffness and environmental stress cracking. GBL behaves the same way and is closely related to N-methylpyrrolidone (NMP), another aprotic solvent that polyethylene cannot hold for continuous service. A poly tank exposed to GBL may look acceptable on day one, then soften, distort and craze over weeks of contact. We rate HDPE and XLPE as U (Unsuitable) for bulk gamma-butyrolactone storage. Use stainless steel (304/316) or a fluoropolymer-lined vessel with PTFE/PFA seals instead, and keep the product dry to limit hydrolysis.
Material compatibility at a glance
Store and handle gamma-butyrolactone in stainless steel (304 or 316) or fluoropolymer-lined equipment with PTFE/PFA seals. Polyethylene (HDPE/XLPE) and polypropylene tanks are not suitable: as a powerful polar aprotic lactone solvent, GBL swells and stress-cracks these resins. Keep the product dry and nitrogen-blanketed to limit hydrolysis and corrosion of bare steel.
| Material | Rating | Note |
|---|---|---|
| HDPE / XLPE | U | Unsuitable. GBL is a strong polar aprotic solvent in the lactone / ester-ketone family; it swells, softens and environmentally stress-cracks polyethylene over time. Not recommended for bulk storage. |
| Polypropylene (PP) | U | Same solvent attack as polyethylene; not recommended for continuous storage. |
| 304 / 316 Stainless Steel | S | Preferred construction for GBL storage and transfer; broadly resistant to the neat solvent. |
| PTFE / PFA | S | Fully resistant fluoropolymer; suitable for gaskets, linings and seals. |
| FKM (Viton) elastomer | C | Conditional. Polar aprotic solvents can swell fluoroelastomers; verify with the seal maker for the service. |
| EPDM elastomer | U | Attacked / swollen by the solvent; not recommended for seals or gaskets. |
| Carbon Steel | C | Conditional. Acceptable when dry; trace water can hydrolyze GBL toward 4-hydroxybutyric acid and promote corrosion - keep blanketed and dry. |
Ratings: S suitable · C conditional / limited · U unsuitable. Verify against the cited resistance charts and your concentration/temperature before specifying.
The safety that actually matters
- Toxic if inhaled (H331) and harmful if swallowed (H302); ingestion has serious central-nervous-system effects - handle as a controlled industrial chemical and follow all applicable regulations.
- Causes serious eye damage (H318) and skin irritation (H315); wear chemical splash goggles, a face shield and solvent-resistant gloves.
- May cause drowsiness or dizziness (H336) and may damage organs (H371); use local exhaust ventilation and keep vapor exposure low.
- Combustible liquid (flash point about 98 C); keep away from heat, sparks and open flame, and bond and ground during transfer.
- Keep dry and nitrogen-blanketed - moisture drives slow hydrolysis to 4-hydroxybutyric acid, which can corrode bare steel.
- Store in stainless steel or fluoropolymer-lined containers; never in polyethylene or polypropylene tanks.
Common questions
- Is gamma-butyrolactone compatible with HDPE or XLPE tanks?
- No. GBL is an aggressive polar aprotic solvent in the lactone/ester-ketone family. It swells, softens and stress-cracks polyethylene over time, so HDPE and XLPE are rated Unsuitable (U) for bulk storage. Use stainless steel or fluoropolymer-lined vessels.
- What material should I use to store GBL?
- Stainless steel (304 or 316) or fluoropolymer-lined equipment with PTFE/PFA seals are the preferred choices. Keep the product dry and nitrogen-blanketed to limit hydrolysis and corrosion of any bare steel surfaces.
- Does gamma-butyrolactone mix with water?
- Yes, it is fully miscible with water in all proportions, and it also mixes with methanol, ethanol and acetone. In the presence of water it slowly hydrolyzes toward 4-hydroxybutyric acid, which raises the corrosion risk for bare carbon steel.
- What is the NFPA 704 rating for gamma-butyrolactone?
- The NFPA 704 rating is 2-1-1: Health 2, Flammability 1 and Instability 1, with no special hazard symbol. It is a combustible liquid with a flash point near 98 C and is toxic by inhalation and ingestion.
How we build Gamma-Butyrolactone (GBL) storage
Gamma-Butyrolactone (GBL) is not a polyethylene-tank chemistry. We build it to the correct material of construction.
Sources & References
All compatibility ratings, hazard classifications, and chemical identifiers on this page are sourced from authoritative third-party publications. Verify against the original references before final specification.
- PubChem Compound Summary: Gamma-Butyrolactone (CID 7302) — Identity, CAS 96-48-0, formula C4H6O2, GHS hazard classification and physical-property records. pubchem.ncbi.nlm.nih.gov
- NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response — Defines the 0-4 Health/Flammability/Instability rating diamond cited as 2-1-1 for GBL. www.nfpa.org
- United Nations Globally Harmonized System (GHS) of Classification and Labelling of Chemicals — Source standard for the H-code hazard statements (H302, H315, H318, H319, H331, H336, H371) and the Danger signal word. unece.org
- Calpaclab Chemical Compatibility Chart - LDPE, HDPE, PP, Teflon — Polyethylene resistance reference showing ketones and aggressive esters as not recommended for continuous use - the basis for the HDPE/XLPE = U verdict on this lactone solvent. www.calpaclab.com
- Professional Plastics HDPE and LDPE Chemical Resistance Chart — Independent polyethylene resistance chart confirming poor performance of polyethylene against ketone and ester-class solvents. www.professionalplastics.com
- GESTIS Substance Database - Gamma-Butyrolactone — European occupational substance record corroborating physical properties (boiling point 204 C, flash point ~98 C, density ~1.13 g/mL) and hazard classification. gestis-database.dguv.de
- NOAA CAMEO Chemicals - Butyrolactone (96-48-0) — Emergency-response reactivity and physical-hazard reference used to confirm flammability and reactivity behavior. cameochemicals.noaa.gov