Overview
Thioglycolic acid (TGA) is an organosulfur compound with a distinctive thiol (-SH) functional group. First synthesized in the 19th century, it has become indispensable in industries ranging from cosmetics to metallurgy due to its dual reactivity as a reducing agent and nucleophile. Its ability to break disulfide bonds makes it a key ingredient in hair care formulations, while its chelating properties are leveraged in chemical manufacturing. Commercially, TGA is produced via the reaction of sodium chloroacetate with sodium hydrosulfide. Industrial-grade TGA typically has a purity of 98-99%, while cosmetic grades undergo additional purification to minimize impurities that could cause skin irritation.
Physical and Chemical Properties
As a liquid at room temperature, TGA exhibits high miscibility with polar solvents like water and ethanol. Its density (1.325 g/cm³) and low viscosity facilitate handling in industrial processes. The compound’s acidity (pKa ~3.6) and redox potential make it effective for breaking sulfur-sulfur bonds in proteins and polymers. Notably, TGA decomposes when heated above 120°C, releasing toxic sulfur oxides. Its strong odor threshold (<1 ppm) necessitates proper ventilation. The compound forms stable complexes with heavy metals (e.g., lead, cadmium), a property exploited in metal extraction and PVC stabilizer production.
Main Applications
In cosmetics, TGA’s primary use is in permanent hair waving solutions (8-11% concentration) and depilatory creams (5-8%), where it reduces keratin disulfide bonds. The pharmaceutical industry employs it as an intermediate for synthesizing antibiotics and anticonvulsants. Industrially, TGA derivatives like tin and lead thioglycolates act as heat stabilizers for PVC. Its metal-chelating ability aids in electroplating baths and ore flotation. Emerging applications include wastewater treatment for heavy metal removal and as a crosslinking agent in polymer chemistry.
Safety and Storage
TGA requires careful handling due to its corrosive nature and volatility. OSHA mandates a permissible exposure limit (PEL) of 1 ppm (8-hour TWA). Storage containers must be made of HDPE or glass-lined steel to prevent degradation. Secondary containment is recommended to manage potential spills. In case of skin contact, immediate flushing with water for 15 minutes is critical, followed by medical attention. Firefighting measures involve alcohol-resistant foam, as TGA is combustible. Transportation regulations classify it as UN 1940 (Class 8, Packing Group II).
B2B Procurement Guide
Bulk buyers should prioritize suppliers with GMP or ISO 9001 certification, especially for cosmetic-grade TGA. Key specifications to verify include: assay (≥98%), iron content (<10 ppm), and residue on ignition (<0.1%). Packaging options range from 25 kg HDPE drums to IBC totes (1000 kg). For logistics, ensure temperature-controlled transport (<30°C) to prevent degradation. Long-term contracts with price adjustment clauses are advisable due to raw material (chloroacetic acid) price volatility. Regional regulations (e.g., EU REACH, US TSCA) may require additional compliance documentation.
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