2-Hexanone

Synonyms & Trade Names

Butyl methyl ketone, MBK, Methyl butyl ketone, Methyl n-butyl ketone

CAS No.

591-78-6

RTECS No.

MP1400000

DOT ID & Guide

Formula

CH₃CO[CH₂]₃CH₃

Conversion

1 ppm = 4.10 mg/m³

IDLH

1600 ppm
See: 591786

Exposure Limits

NIOSH REL

TWA 1 ppm (4 mg/m³)

OSHA PEL

TWA 100 ppm (410 mg/m³) See Appendix G

Measurement Methods

NIOSH 1300 , 2555;
OSHA PV2031
See: NMAM or OSHA Methods

Physical Description

Colorless liquid with an acetone-like odor.

Molecular Weight

100.2

Boiling Point

262°F

Freezing Point

-71°F

Solubility

Vapor Pressure

11 mmHg

Ionization Potential

9.34 eV

Specific Gravity

0.81

Flash Point

77°F

Upper Explosive Limit

Lower Explosive Limit

Class IC Flammable Liquid: Fl.P. at or above 73°F and below 100°F.

Incompatibilities & Reactivities

Strong oxidizers

Exposure Routes

inhalation, skin absorption, ingestion, skin and/or eye contact

Symptoms

irritation eyes, nose; peripheral neuropathy: lassitude (weakness, exhaustion), paresthesia; dermatitis; headache, drowsiness

Target Organs

Eyes, skin, respiratory system, central nervous system, peripheral nervous system

Personal Protection/Sanitation

(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet (flammable)
Change:No recommendation

First Aid

(See procedures)
Eye:Irrigate immediately
Skin:Soap wash immediately
Breathing:Respiratory support
Swallow:Medical attention immediately

Respirator Recommendations

NIOSH

Up to 10 ppm:
(APF = 10) Any supplied-air respirator

Up to 25 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode

Up to 50 ppm:
(APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is 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

Up to 1600 ppm:
(APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode

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

2-Hexanone

NIOSH REL

OSHA PEL

Follow NIOSH

NIOSH Homepage