Label abbreviations descriptions

4-METHOXYPHENOL

Chemical Identification
CAS # 150-76-5
Formula

C₇H₈O₂
Synonyms

hydroquinone monomethyl ether; p-hydroxyanisole; mequinol; p-methoxyphenol; monomethyl ether hydroquinone

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
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.

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

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

Last Updated Date : 12/15/2020