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MERCAPTOACETIC ACID
ICSC: 0915
Peer-Review Status: 26.11.1998 Validated
Thioglycolic acid
Ethanethiol-2-acid-1
2-Mercaptoethanoic acid 
CAS #: 68-11-1 RTECS #: AI5950000
UN #: 1940
EC #: 607-090-00-6
EINECS #: 200-677-4
    Formula: C2H4O2S / HSCH2COOH
Molecular mass: 92.1

TYPES OF
HAZARD /
EXPOSURE
ACUTE HAZARDS / SYMPTOMS      PREVENTION      FIRST AID / FIRE FIGHTING
FIRE Combustible. Gives off irritating or toxic fumes (or gases) in a fire.  NO open flames.  Use water spray, powder, alcohol-resistant foam, carbon dioxide. 
EXPLOSION      
 
EXPOSURE   AVOID ALL CONTACT!  IN ALL CASES CONSULT A DOCTOR! 
Inhalation Abdominal cramps. Burning sensation. Cough. Laboured breathing. Shortness of breath. Sore throat. Symptoms may be delayed. See Notes.  Use ventilation, local exhaust or breathing protection.  Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention. See Notes. 
Skin MAY BE ABSORBED! Redness. Skin burns. Pain. Blisters. See Inhalation.  Protective gloves. Protective clothing.  Remove contaminated clothes. Rinse and then wash skin with water and soap. Refer for medical attention . 
Eyes Redness. Pain. Loss of vision. Severe deep burns.  Wear face shield or eye protection in combination with breathing protection.  First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention. 
Ingestion Abdominal pain. Burning sensation. Shock or collapse.  Do not eat, drink, or smoke during work.  Rinse mouth. Do NOT induce vomiting. Give one or two glasses of water to drink. Refer for medical attention . 

SPILLAGE DISPOSAL
PACKAGING & LABELLING
Evacuate danger area! Consult an expert! Personal protection: chemical protection suit including self-contained breathing apparatus. Ventilation. Collect leaking liquid in sealable containers. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations.  Unbreakable packaging.
Put breakable packaging into closed unbreakable container.
Do not transport with food and feedstuffs. 
EC Classification
Symbol: T; R: 23/24/25-34; S: (1/2)-25-27-28-45 
UN Classification
UN Hazard Class: 8; UN Pack Group: II 
GHS Classification
 

EMERGENCY RESPONSE SAFE STORAGE
Transport Emergency Card: TEC (R)-80G20.  Separated from strong oxidants, strong bases, food and feedstuffs and combustible substances. Keep in a well-ventilated room. 

IMPORTANT DATA
Physical State; Appearance
COLOURLESS VISCOUS LIQUID WITH CHARACTERISTIC ODOUR. 

Physical dangers
No data. 

Chemical dangers
Decomposes on burning. This produces toxic fumes of sulfur oxides and hydrogen sulfide. The substance is a medium strong acid. Reacts with strong oxidants, alkalis and organic compounds. Attacks steel, stainless steel and aluminium. 

Occupational exposure limits
TLV: 1ppm, 3.8mg/m³ as TWA; (skin); (ACGIH 1997). 

Routes of exposure
The substance can be absorbed into the body by inhalation, through the skin and by ingestion. 

Inhalation risk
A harmful contamination of the air can be reached very quickly on evaporation of this substance at 20°C. 

Effects of short-term exposure
The substance is corrosive to the eyes, skin and respiratory tract. Inhalation of of the vapour may cause lung oedema. Exposure above the OEL could cause death. The effects may be delayed. Medical observation is indicated. See Notes. 

Effects of long-term or repeated exposure
 


PHYSICAL PROPERTIES ENVIRONMENTAL DATA
Boiling point: 120°C
Melting point: -16.5°C
Relative density (water = 1): 1.3
Solubility in water: miscible
Vapour pressure, kPa at 18°C: 1.3
Relative vapour density (air = 1): 3.2
Relative density of the vapour/air-mixture at 20°C (air = 1): 1.00
Flash point: 126°C o.c.
Auto-ignition temperature: 350°C
Explosive limits, vol% in air: 5.9-?
Octanol/water partition coefficient as log Pow: 0.05  
 

NOTES
The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.
Rest and medical observation is therefore essential.
Immediate administration of an appropriate spray, by a doctor or a person authorized by him/her, should be considered. 

ADDITIONAL INFORMATION
 

IPCS
International
Programme on
Chemical Safety
WHO ILO EC Prepared in the context of cooperation between the International Programme on Chemical Safety and the European Commission
© IPCS 2004-2012
LEGAL NOTICE Neither the EC nor the IPCS nor any person acting on behalf of the EC or the IPCS is responsible for the use which might be made of this information.


    See Also:
       Toxicological Abbreviations