THIOGLYCOLIC ACID

Chemical Identification
Chemical Identification
CAS # 68-11-1
Formula

C₂H₄O₂S

Synonyms

Acetyl mercaptan; Mercaptoacetate; Mercaptoacetic acid; 2-Mercaptoacetic acid; 2-Thioglycolic acid; Thiovanic acid

Physical Properties
Physical Properties
Physical description Colorless liquid with a strong, disagreeable odor characteristic of mercaptans.
Boiling point 248°F at 20 mmHg Molecular weight 92.12
Freezing point/melting point 2.3°F Vapor pressure 10 mmHg at 64°F
Flash point 235°F Vapor density
Specific gravity 1.33 Ionization potential
Lower explosive limit (LEL) 5.9% Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.)
Sampling group
Sampler/Sampling media
Sampling time*
Sampling volume (TWA)*
Sampling flow rate (TWA)*
Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments
Method reference
Notes
Special requirements

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA REL-TWA

1 ppm (4 mg/m³)

TLV-TWA

1 ppm [2017]

PEL-TWA

1 ppm (3.8 mg/m³)

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

NA

Skin notation

Y

Skin notation

Y

Skin notation

Y

Notes:

Not established

Notes: Notes:

dermal sensitization (DSEN)

Notes:
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Thioglycolic acid

NIOSH: Pocket Guide to Chemical Hazards - Thioglycolic acid

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Thioglycolic acid. See annual publication for most recent information.

Last Updated Date : 01/13/2021