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Gamma-Butyrolactone Powder (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 Powder 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 Powder, 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.
Gamma-Butyrolactone (GBL) has widespread industrial use. It is a common solvent found in
paint strippers, nail polish removers, stain removers and circuit board cleaners. It is also a
common intermediate in industrial chemistry including the manufacture of pyrrolidones and in
some pharmaceuticals. International production and trade of GBL is at least of the order of
hundreds of thousands of metric tons. Single consignments can be up to 500 tons alone.
Since the end of the 1990s, certain individuals have ingested GBL for the purpose of
intoxication. GBL is chemically similar to gamma-hydroxybutyrate (GHB), a compound in
Schedule II of the 1971 Convention. GHB is easily synthesized from GBL by changing the pH
with addition of an alkali (e.g. sodium hydroxide), and recipes and “kits” have been provided
on the Internet identifying or providing the ingredients to do so. Synthetic conversion of GBL
to make GHB is unnecessary, however, because it is rapidly metabolized to GHB following its
ingestion, and its clinical effects are identical to GHB. This makes the epidemiology of GBL’s
and GHB’s use and abuse intrinsically (and forensically) linked. Because the onset of action of
GBL is faster than GHB, its potency greater, and its duration of activity longer, its abuse
potential may actually be greater than GHB itself.
There is a steep dose-effect curve between doses producing desired and excessive effects, and
there have been numerous published reports of adverse reactions to GBL including fatalities.
Signs and symptoms can include: euphoria, relaxation, reduced inhibition and sedation
progressing to vomiting, urinary and fecal incontinence, agitation, convulsions, bradycardia,
respiratory depression, coma and death.
GBL is sold as a liquid, often presented in illicit sale as GHB. Prices of GBL vary between 9
cents to 2 euros for a recreational dose (1 ml). GBL is often used with other drugs, particularly
cannabis, alcohol and ecstasy. Accurate estimates of the prevalence of the use of GBL for its
intoxicating effects are not available, in part because of its rapid conversion to GHB, but also
because it is not routinely tested during forensic examination. Best estimate of the prevalence
of its use, while giving consideration that reports of GHB use may actually be attributable to
the ingestion of GBL, is low in Europe and the United States, but possibly significantly higher
in other pockets of the world such as Australasia.
10 Grams, 25 Grams, 50 Grams, 100 Grams, 250 Grams, 500 Grams, 1000 Grams