NIOSH Pocket Guide to Chemical Hazards


CAS 150-76-5


RTECS SL7700000
Synonyms & Trade Names
Hydroquinone monomethyl ether, p-Hydroxyanisole, Mequinol, p-Methoxyphenol, Monomethyl ether hydroquinone
DOT ID & Guide


NIOSH REL: TWA 5 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
Colorless to white, waxy solid with an odor of caramel & phenol.
MW: 124.2
BP: 469°F
MLT: 135°F
Sol(77°F): 4%
VP: <0.01 mmHg
IP: 7.50 eV

Sp.Gr: 1.55
Fl.P(oc): 270°F
UEL: ?
LEL: ?

Combustible Solid; under certain conditions, a dust cloud can probably explode if ignited by a spark or flame.
Incompatibilities & Reactivities
Strong oxidizers, strong bases, acid chlorides, acid anhydrides
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash, Quick drench
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat, upper respiratory system; eye, skin burns; central nervous system depression
Target Organs Eyes, skin, respiratory system, central nervous system