Product Name: Thiolactic Acid
Chemical Name: 2-Mercaptopropanoic acid
CAS Number: 79-42-5
Synonyms: α-Mercaptopropionic acid, α-thiolactic acid
Recommended Use: Chemical intermediate, laboratory reagent, cosmetics additive
Supplier: Information available from distributor or manufacturer on product label
Contact Information: Emergency contact number and address provided with shipment paperwork
Emergency Overview: Colorless or pale yellow liquid with strong odor
Main Hazards: Irritation to eyes, skin, and respiratory tract; harmful if swallowed or inhaled
Classification: Acute toxicity, skin corrosion/irritation, eye damage/irritation
Label Elements: Corrosive pictogram, exclamation mark for general harm
Hazard Statements: Causes skin burns and eye damage; may cause respiratory irritation
Precautionary Statements: Avoid breathing vapors, wear protective gloves and eyewear, wash hands thoroughly after handling
Hazard Codes: H314 (skin corrosion), H335 (respiratory irritation), H302 (harmful if swallowed)
Chemical Identity: Thiolactic Acid
Concentration: Greater than 98% (technical grade)
Other Components: Trace impurities or stabilizers below disclosure thresholds
Molecular Formula: C3H6O2S
Molecular Weight: 106.14 g/mol
Inhalation: Move to fresh air, keep individual at rest, seek medical advice if breathing becomes difficult
Skin Contact: Remove contaminated clothing, wash skin with plenty of water for at least fifteen minutes, call for medical aid for persistent irritation
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if possible, continue rinsing, get medical attention
Ingestion: Rinse mouth, offer water, do not induce vomiting, call poison control or seek immediate medical help
Most Important Symptoms: Burning, redness, pain, tearing, sore throat, stomach upset
Medical Attention: Provide this sheet to emergency personnel and notify them about chemical exposure
Suitable Extinguishing Media: Dry chemical, foam, water spray, carbon dioxide
Unsuitable Media: Direct stream of water as it may spread material
Hazardous Combustion Products: Oxides of sulfur and carbon, toxic fumes
Fire-Fighting Procedures: Wear self-contained breathing apparatus, protective clothing, contain and recover runoff if safe
Specific Hazards: May emit poisonous gases when heated strongly or burned
Risk of Explosion: Not classified as explosive, but closed containers can rupture under fire conditions
Personal Precautions: Put on gloves, goggles, and suitable protective clothing; use respiratory protection if vapors are high
Environmental Precautions: Prevent entry into waterways, drains, or soil; alert authorities if spill is large
Methods for Cleaning Up: Absorb with inert material (sand, earth), place in chemical waste container, provide ventilation
Decontamination: Flush affected area with lots of water after cleanup
Handling Spilled Material: Avoid contact with skin, eyes, and clothing; do not use unprotected tools or bare hands
Safe Handling: Use only in well-ventilated areas, keep away from heat and open flames, do not inhale vapors or ingest
Personal Hygiene: Wash hands thoroughly after working, do not eat or drink in handling area, change contaminated clothes
Storage Requirements: Store tightly sealed in corrosion-resistant container, away from incompatible materials (alkalis, strong oxidizers)
Temperature Recommendations: Keep in cool, dry, well-ventilated place, avoid freezing or overheating
Special Precautions: Label containers clearly, keep away from direct sunlight, segregate from food and feedstuffs
Exposure Limits: No established occupational exposure limits; minimize exposure with best available controls
Engineering Controls: Use local exhaust ventilation, fume hood for laboratory work, keep containers closed
Respiratory Protection: Approved respirator if ventilation inadequate, especially in confined spaces
Hand Protection: Chemical-resistant gloves made from nitrile or neoprene
Eye Protection: Tight-fitting safety glasses or splash-proof goggles
Skin and Body Protection: Lab coat or apron, long sleeves, chemical-resistant shoes or boots
Environmental Controls: Maintain spill kits and eyewash stations nearby, monitor workplace concentrations where possible
Appearance: Clear to pale yellow liquid
Odor: Pungent, unpleasant sulfur-like odor
Odor Threshold: Strong, detectable at low concentrations
pH: Acidic in aqueous solution (approx. 1 – 2 at 10%)
Melting Point: −16°C (3°F)
Boiling Point: 166°C (330°F) at standard pressure
Flash Point: 93°C (199°F) closed cup
Evaporation Rate: Slower than water
Flammability: Not highly flammable, but vapors can ignite at elevated temperature
Vapor Pressure: 0.2 mmHg at 20°C
Vapor Density: Heavier than air
Relative Density: About 1.26 @ 20°C
Solubility: Miscible with water, soluble in alcohol and ether
Partition Coefficient (log Kow): Approximately −0.25
Autoignition Temperature: Not determined
Decomposition Temperature: Begins above 180°C
Viscosity: Thin liquid at room temperature
Chemical Stability: Stable under recommended storage and handling conditions
Reactive Conditions: Avoid strong heat, flame, direct sunlight, incompatible chemicals
Incompatible Materials: Alkalis, strong oxidizing agents, strong bases, reducing agents, amines
Polymerization: Does not polymerize under normal conditions
Hazardous Decomposition Products: Sulfur oxides, carbon monoxide, carbon dioxide, hydrogen sulfide on thermal breakdown
Conditions to Avoid: Prolonged exposure to elevated heat or light, moisture if not tightly sealed
Routes of Exposure: Inhalation, skin contact, ingestion, eye contact
Acute Toxicity: Oral LD50 (rat): approx. 160 mg/kg; dermal LD50 (rabbit): data not available
Skin Effects: Causes burns, redness, swelling
Eye Effects: Severe irritation, risk of permanent eye damage
Respiratory Effects: Irritation, coughing, sore throat
Ingestion Effects: Abdominal pain, nausea, vomiting
Chronic Effects: Not fully studied; prolonged or repeated contact can increase risk of dermatitis
Carcinogenicity: No evidence to suggest carcinogenic risk under normal exposure
Sensitization: Possible allergic skin response after repeated exposure
Mutagenicity: Not classified as a mutagen on available evidence
Aquatic Toxicity: Harmful to aquatic life; estimated LC50 (fish): 100 – 200 mg/L
Bioaccumulation Potential: Low, based on log Kow and rapid metabolization
Mobility in Soil: Expected to be mobile due to high water solubility
Degradation: Readily biodegradable by natural processes
Persistence: Not considered persistent in typical environmental conditions
Other Adverse Effects: Avoid discharge to environment, spill containment measures should be in place
Waste Treatment Methods: Dispose of in compliance with local, state, and federal regulations
Disposal Containers: Use corrosion-resistant, labeled chemical waste containers
Incineration: Permitted for hazardous waste at properly equipped facilities
Waste Codes: Depends on regional classification for organic acids
Other Recommendations: Do not pour into drains or watercourses, do not mix with incompatible waste
Contaminated Packaging: Rinse thoroughly, treat as chemical waste
UN Number: 3265
Proper Shipping Name: Corrosive Liquid, Acidic, Organic, N.O.S. (Contains Thiolactic Acid)
Transport Hazard Class: 8 (Corrosive)
Packing Group: II
Labeling Requirements: Corrosive label (hazard symbol and word)
Special Precautions for User: Secure containers, avoid exposure, carry spill-response material
Environmental Hazards: Marine pollutant rules may apply in some regions
Transport Regulations: Follow all DOT, ADR, IMDG, and IATA requirements as applicable
TSCA: Listed in US Toxic Substances Control Act
REACH: Registered under EU REACH, subject to restrictions
OSHA: Classified as hazardous, subject to hazard communication standards
SARA Title III: Not listed for threshold planning but comply with general reporting
WHMIS: Listed as D2B (toxic material causing other effects)
Other Regional Regulations: Check local state, provincial, and municipal requirements for additional restrictions
Hazard Phrases: H314 (causes severe skin burns and eye damage), P260 (do not breathe mist or vapors), P280 (wear protective gear)
