1. OSHA Occupational Chemical Database
  2. 4-METHOXYPHENOL
Label abbreviations descriptions

4-METHOXYPHENOL

Chemical Identification
Chemical Identification
CAS # 150-76-5
Formula

C₇H₈O₂
Synonyms

hydroquinone monomethyl ether; p-hydroxyanisole; mequinol; p-methoxyphenol; monomethyl ether hydroquinone
Physical Properties
Physical Properties
Physical description Colorless to white, waxy solid with an odor of caramel & phenol.
Boiling point 469°F Molecular weight 124.2
Freezing point/melting point 126.5°F Vapor pressure <0.01 mmHg
Flash point 270°F (open cup) Vapor density
Specific gravity 1.55 Ionization potential 7.50 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
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) M329
Sampling group
Sampler/Sampling media XAD-7 tube (100/50 mg) [SKC 226-95]
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 PV2039 (partially validated)
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

5 mg/m³

 TLV-TWA
 

5 mg/m³ [1992]

 PEL-TWA
 

5 mg/m³
PEL-STEL REL-STEL TLV-STEL
 

 

 PEL-STEL
 

 
PEL-C REL-C
 

 

 TLV-C
 

 

 PEL-C
 

 
Skin notation

NA

 Skin notation
 

N

 Skin notation
 

N

 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
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Hydroquinone monomethyl ether

NIOSH: Pocket Guide to Chemical Hazards - 4-Methoxyphenol

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - 4-Methoxyphenol. See annual publication for most recent information.
  • Occupational Health Guidelines for Chemical Hazards. US Department of Health and Human Services (DHHS), National Institute for Occupational Safety and Health (NIOSH) Publication No. 81-123, (1981, January). Provides a table of contents of guidelines for many hazardous chemicals. The files provide technical chemical information, including chemical and physical properties, health effects, exposure limits, and recommendations for medical monitoring, personal protective equipment (PPE), and control procedures.

Last Updated Date : 12/15/2020