# NIOSH Pocket Guide to Chemical Hazards
tert-Butyl alcohol | CAS 75-65-0
(CH3)3COH | RTECS EO1925000
Synonyms & Trade Names 2-Methyl-2-propanol, Trimethyl carbinol | DOT ID & Guide 1120 129
Exposure Limits | NIOSH REL: TWA 100 ppm (300 mg/m3) ST 150 ppm (450 mg/m3)
OSHA PEL†: TWA 100 ppm (300 mg/m3)
IDLH 1600 ppm | Conversion 1 ppm = 3.03 mg/m3
Physical Description Colorless solid or liquid (above 77°F) with a camphor-like odor. [Note: Often used in aqueous solutions.]
MW: 74.1 | BP: 180°F | FRZ: 78°F | Sol: Miscible
VP(77°F): 42 mmHg | IP: 9.70 eV |  | Sp.Gr: 0.79 (Solid)
Fl.P: 52°F | UEL: 8.0% | LEL: 2.4% |
Combustible Solid Class IB Flammable Liquid
Incompatibilities & Reactivities Strong mineral acids, strong hydrochloric acid, oxidizers
Measurement Methods NIOSH 1450; OSHA 7
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 1600 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£/(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)£/(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)/(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode/(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, nose, throat; drowsiness, narcosis
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION