# NIOSH Pocket Guide to Chemical Hazards
5-Methyl-3-heptanone | CAS 541-85-5
C2H5COCH2CH(CH3)CH2CH3 | RTECS MJ7350000
Synonyms & Trade Names Amyl ethyl ketone, Ethyl amyl ketone, 3-Methyl-5-heptanone | DOT ID & Guide 2271 127
Exposure Limits | NIOSH REL: TWA 25 ppm (130 mg/m3)
OSHA PEL: TWA 25 ppm (130 mg/m3)
IDLH 100 ppm | Conversion 1 ppm = 5.24 mg/m3
Physical Description Colorless liquid with a pungent odor.
MW: 128.2 | BP: 315°F | FRZ: -70°F | Sol: Insoluble
VP: 2 mmHg | IP: ? |  | Sp.Gr: 0.82
Fl.P: 138°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 1301
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: Water flush Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 100 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)*/(APF = 25) Any powered, air-purifying respirator with 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 = 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, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, mucous membrane; headache; narcosis, coma; dermatitis
Target Organs Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION