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Parameter Specification
Product Name Gamma-Butyrolactone (GBL)
Chemical Formula C₄H₆O₂
CAS Number 96-48-0
Molecular Weight 86.09 g/mol
Appearance Clear, colorless, oily liquid
Odor Mild, characteristic odor
Purity ≥ 99.5% (industrial or reagent grade)
Moisture Content ≤ 0.05%
Boiling Point ~204 °C
Melting Point -43 °C
Density (20°C) 1.125 g/cm³
Refractive Index (20°C) ~1.436
Solubility Miscible with water, alcohols, ketones, esters
Flash Point ~98 °C (Closed cup)
Stability Stable under recommended storage conditions
Storage Cool, dry, well-ventilated area, away from acids/oxidizers

GBL in Alloy Wheel Cleaner Applications
Function:
GBL is used in wheel cleaners and degreasers due to its strong solvent properties, capable of dissolving:

Brake dust

Road grime

Tar

Oil/grease

Oxidized metal buildup

Usage Concentration:
Typically used at 5–20% in alloy wheel cleaner formulations, often blended with:

Surfactants (nonionic or anionic)

Water

pH adjusters (e.g., citric acid, NaOH)

Corrosion inhibitors

Health & Safety (Key Warnings)
Hazards Details
Toxicity Harmful if swallowed or inhaled
Irritation Can cause skin and eye irritation
Controlled Substance GBL is regulated in many countries (due to potential use in illicit drug synthesis – GHB precursor)
Personal Protection Use gloves, goggles, and work in ventilated space

Packaging & Transport
Packaging Options 1L, 5L, 25L HDPE bottles; 200L drums; 1,000L IBC tanks
UN Number UN 2810
Transport Hazard Class Class 6.1 (Toxic substances)