# NIOSH Pocket Guide to Chemical Hazards
Methylcyclohexanol | CAS 25639-42-3
CH3C6H10OH | RTECS GW0175000
Synonyms & Trade Names Hexahydrocresol, Hexahydromethylphenol | DOT ID & Guide 2617 129
Exposure Limits | NIOSH REL: TWA 50 ppm (235 mg/m3)
OSHA PEL†: TWA 100 ppm (470 mg/m3)
IDLH 500 ppm | Conversion 1 ppm = 4.67 mg/m3
Physical Description Straw-colored liquid with a weak odor like coconut oil.
MW: 114.2 | BP: 311-356°F | FRZ: -58°F | Sol: 4%
VP(86°F): 2 mmHg | IP: 9.80 eV |  | Sp.Gr: 0.92
Fl.P: 149-158°F | UEL: ? | LEL: ? |
Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods NIOSH 1404
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash promptly Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH Up to 500 ppm: (APF = 10) Any supplied-air respirator*/(APF = 50) Any self-contained breathing apparatus 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, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, upper respiratory system; headache; in animals: narcosis; liver, kidney damage
Target Organs Eyes, skin, respiratory system, central nervous system, kidneys, liver
See also: INTRODUCTION