# NIOSH Pocket Guide to Chemical Hazards
o-Methylcyclohexanone | CAS 583-60-8
CH3C6H9O | RTECS GW1750000
Synonyms & Trade Names 2-Methylcyclohexanone | DOT ID & Guide 2297 127
Exposure Limits | NIOSH REL: TWA 50 ppm (230 mg/m3) ST 75 ppm (345 mg/m3) [skin]
OSHA PEL†: TWA 100 ppm (460 mg/m3) [skin]
IDLH 600 ppm | Conversion 1 ppm = 4.59 mg/m3
Physical Description Colorless liquid with a weak, peppermint-like odor.
MW: 112.2 | BP: 325°F | FRZ: 7°F | Sol: Insoluble
VP: 1 mmHg | IP: ? |  | Sp.Gr: 0.93
Fl.P: 118°F | UEL: ? | LEL: ? |
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities Strong oxidizers
Measurement Methods NIOSH 2521
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* Up to 600 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode*/(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, skin absorption, ingestion, skin and/or eye contact
Symptoms In animals: irritation eyes, mucous membrane; narcosis; dermatitis
Target Organs Skin, respiratory system, liver, kidneys, central nervous system
See also: INTRODUCTION