# 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
Exposure Limits | 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 OSHA PV2014
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
See also: INTRODUCTION