NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

o-Methylcyclohexanone

CAS
583-60-8

CH3C6H9O

RTECS
GW1750000
Synonyms & Trade Names

2-Methylcyclohexanone
DOT ID & Guide
2297 / 128

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 See: 583608
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 100F and below 140F.
Incompatibilities & Reactivities

Strong oxidizers
Measurement Methods
NIOSH 2521
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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
Important additional information about respirator selection
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