Chemical Sampling Information
	o-Methylcyclohexanone
Quick Links General Description Exposure Limits Health Factors Monitoring Search    [use word(s)/phrase] Table of Contents By Name A B C D E F G H I J K L M N O P Q R S T U V W X Y Z By CAS Number General Description Synonyms: 2-Methylcyclohexanone; alpha-Methylcyclohexanone OSHA IMIS Code Number: 1765 Chemical Abstracts Service (CAS) Registry Number: 583-60-8 NIOSH, Registry of Toxic Effects (RTECS) Identification Number: GW1750000 Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 2297 128 [27 KB, PDF] NIOSH Pocket Guide to Chemical Hazards, o-Methylcyclohexanone: chemical description, physical properties, potentially hazardous incompatibilities, and more Exposure Limits OSHA Permissible Exposure Limit (PEL) for General Industry: 29 CFR 1910.1000 Z-1 Table -- 100 ppm, 460 mg/m3 TWA; Skin OSHA Permissible Exposure Limit (PEL) for Construction Industry: 29 CFR 1926.55 Appendix A -- 100 ppm, 460 mg/m3 TWA; Skin OSHA Permissible Exposure Limit (PEL) for Maritime: 29 CFR 1915.1000 Table Z-Shipyards -- 100 ppm, 460 mg/m3 TWA; Skin American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 50 ppm, 229 mg/m3 TWA; 75 ppm, 344 mg/m3 STEL; Skin National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 50 ppm, 230 mg/m3 TWA; 75 ppm, 345 mg/m3 STEL; Skin Health Factors NIOSH Immediately Dangerous To Life or Health Concentration (IDLH): 600 ppm Potential symptoms: In animals: eye, mucous membrane irritation; narcosis; dermatitis Health Effects: Irritation-Eye, Nose, Throat, Skin---Mild (HE16); Narcosis (HE8) Affected organs: Skin, respiratory system, liver, kidneys, CNS Notes: o-Methylcyclohexanone is a flavoring agent (Flavor and Extract Manufacturers Association number 3946; Joint FAO/WHO Expert Committee on Food Additives number 1102) that is considered to be generally recognized as safe when used as a flavoring agent. It may also be used as a solvent in varnish and plastics manufacturing, and in rust removal. o-Methylcyclohexanone may be absorbed through the skin. No human studies on the disposition or biomonitoring of o-methylcyclohexanone were found; an efficient reduction to the corresponding alcohol by pig testicular 20ß-hydroxysteroid dehydrogenase has been reported. Date Last Revised: 01/05/2007 Literature Basis: NIOSH Pocket Guide to Chemical Hazards: o-Methylcyclohexanone. Nakajin, S., Tamura, F., Takase, N. and Toyoshima, S.; Carbonyl reductase activity exhibited by pig testicular 20 beta-hydroxysteroid dehydrogenase. Biol. Pharm. Bull. 29(11): 1215-1218, 1997. Newberne, P., et al.: GRAS flavoring substances 19. Food Technol. 54(6): 66-68, 70, 72-74, 76-84, 2000. Pohanish, R.P. (editor): 2-Methylcyclohexanone. In, Sittig’s Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1549-1550. Monitoring Methods used by OSHA Laboratory Sampling/Analytical Method: sampling media: Porapak Q tube (150/75 mg section, 50/80 mesh) analytical solvent: Acetone maximum volume: 6 Liters   maximum flow rate: 0.05 L/min (TWA) maximum volume: 1 Liter   maximum flow rate: 0.1 L/min (STEL) current analytical method: Gas Chromatography; GC/FID method reference: NIOSH Analytical Method (NIOSH 2521) [24 KB, PDF] method classification: Fully Validated All Trademarks are the property of their respective owners. Accessibility Assistance: Contact the OSHA Directorate of Science, Technology and Medicine at 202-693-2300 for assistance accessing PDF materials.