PHENYL MERCAPTAN

Chemical Identification
CAS #	108-98-5
Formula	C₆H₆S
Synonyms	mercaptobenzene; phenyl mercaptan; thiophenol; benzenethiol

Physical Properties
Physical description	Clear liquid with a repulsive odor.
Boiling point	336°F	Molecular weight	110.17
Freezing point/melting point	5.4°F	Vapor pressure	1 mmHg at 65.48°F
Flash point	132°F	Vapor density
Specific gravity	1.073	Ionization potential	8.33 eV
Lower explosive limit (LEL)		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
Analyte code (IMIS no.)	P105
Sampling group
Sampler/Sampling media	GFF (37 mm Gelman Type A) coated with mercuric acetate [SKC 225-9007]
Sampling time^*
Sampling volume (TWA)^*	20 L
Sampling flow rate (TWA)^*	0.2 L/min
Sampling volume (STEL/Peak/C)^*
Sampling flow rate (STEL/Peak/C)^*
Analytical method instruments	GC-FID
Method reference	OSHA PV2075 (partially validated)
Notes	Protect samples from light until analysis.
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.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**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		TLV-TWA	0.1 ppm [2001]	PEL-TWA	0.5 ppm (2 mg/m³)
PEL-STEL		REL-STEL		TLV-STEL		PEL-STEL
PEL-C		REL-C	0.1 ppm (0.5 mg/m³) [15 minutes]	TLV-C		PEL-C
Skin notation	NA	Skin notation	N	Skin notation	Y	Skin notation	N
Notes: Not established		Notes:		Notes:		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

NOAA: CAMEO Chemicals - Phenyl mercaptan

NIOSH: Pocket Guide to Chemical Hazards - Benzenethiol

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Phenyl mercaptan. See annual publication for most recent information.
Fairchild, E.J. and Stokinger, H.E.: Toxicologic studies on organic sulfur compounds. 1. Acute toxicity of some aliphatic and aromatic thiols (mercaptans). AIHA J. 19: 171-189, 1958.
No authors listed: Reproductive Toxicity of Thiophenol II (CAS No: 108-98-5) Administered by Gavage to Sprague-Dawley Rats. NTP Report# RACB94001 [Abstract].
No authors listed: Developmental Toxicity of Thiophenol (CAS No. 108-98-5) in Sprague-Dawley (CD®) Rats. NTP Study: TER92133 [Abstract].
No authors listed: Developmental Toxicity of Thiophenol (CAS No. 108-98-5) in New Zealand White Rabbits. NTP Study: TER92134 [Abstract].
Pohanish, R.P. (editor): Phenyl Mercaptan. Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1837-1839.

Last Updated Date : 01/08/2021

PHENYL MERCAPTAN

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References