Gamma-Butyrolactone Liquid (γ-butyrolactone or GBL) is a hygroscopic compound with a weak characteristic odor and is soluble in water. GBL is a common solvent and reagent in chemistry and is used as an aroma compound, as a stain remover, as a superglue remover, as a paint stripper, and as a solvent in some wet aluminium electrolytic capacitors.
Gamma-Butyrolactone Liquid GBL (gamma butyrolactone, ‘geeb’) is a clear liquid solvent. It is a prodrug for the illegal substance GHB, which means that the body naturally converts it into GHB.
Gamma-Butyrolactone Liquid, It is sold in the grey market, often as ‘alloy cleaner’ or ‘rust remover’ and smells pretty much like you’d expect an industrial solvent to smell like.
It is hard to store, requiring a glass bottle or bottle of a certain type of plastic. It will melt through most plastics. Yum!
GBL, butyrolactone, 1,4-lactone, 4-butyrolactone, 4-hydroxybutyric acid lactone, gamma-hydroxybutyric acid lactone, and oxolan-2-one
CAS number 96-48-0
RTECS number LU3500000
Jmol-3D images Image 1
Molecular formula C4H6O2
Molar mass 86.09 g mol−1
Appearance Colorless liquid
Density 1.1286 g/mL (15 °C), 1.1296 g/mL (20 °C)
Melting point −43.53 °C (−46.35 °F; 229.62 K)
Boiling point 204 °C (399 °F; 477 K)
Solubility in water Miscible
Solubility soluble in CCl4, methanol, ethanol, acetone, benzene, ethyl ether
Acidity (pKa) 4.5
Refractive index (nD) 1.435, 1.4341 (20 °C)
Viscosity 1.7 cp (25 °C)
R-phrases R22 R36
S-phrases S26 S36
Main hazards Harmful
Flash point 98 °C (208 °F; 371 K) (closed cup)
LD50 17.2 mL/kg (orally, rat)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
There is a very good reason for starting small, which we will come to soon. Do not drink it neat straight from the pipette.
If it’ll clean alloys, it’ll not be nice to your teeth, gums, tongue and throat. Most people prefer to mix it with fruit juice in a shot glass.
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