NIOSH Pocket Guide to Chemical Hazards

Catechol CAS 120-80-9
C6H4(OH)2 RTECS UX1050000
Synonyms & Trade Names
1,2-Benzenediol; o-Benzenediol; 1,2-Dihydroxybenzene; o-Dihydroxybenzene; 2-Hydroxyphenol; Pyrocatechol
DOT ID & Guide
NIOSH REL: TWA 5 ppm (20 mg/m3) [skin]
OSHA PEL†: none
IDLH N.D. Conversion 1 ppm = 4.50 mg/m3
Physical Description
Colorless, crystalline solid with a faint odor. [Note: Discolors to brown in air & light.]
MW: 110.1
BP: 474°F
MLT: 221°F
Sol: 44%
VP(244°F): 10 mmHg
IP: ?

Sp.Gr: 1.34
Fl.P: 261°F
UEL: ?
LEL: 1.4%

Combustible Solid
Incompatibilities & Reactivities
Strong oxidizers, nitric acid
Measurement Methods
Personal Protection & Sanitation
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: Daily
Provide: Eyewash
First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water wash immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations To be added later
Exposure Routes inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, respiratory system; skin sensitization, dermatitis; lacrimation (discharge of tears), burns eyes; convulsions, increased blood pressure, kidney injury
Target Organs Eyes, skin, respiratory system, central nervous system, kidneys