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Hexone

Synonyms & Trade Names
Isobutyl methyl ketone, Methyl isobutyl ketone, 4-Methyl 2-pentanone, MIBK
CAS No.
108-10-1
RTECS No.
SA9275000
DOT ID & Guide
1245 127
Formula
CH₃COCH₂CH(CH₃)₂
Conversion
1 ppm = 4.10 mg/m3
IDLH
500 ppm
See: 108101
Exposure Limits
NIOSH REL
TWA 50 ppm (205 mg/m3) ST 75 ppm (300 mg/m3)
OSHA PEL
TWA 100 ppm (410 mg/m3) See Appendix G
Measurement Methods
NIOSH 1300 , 2555;
OSHA 1004
See: NMAM or OSHA Methods
Physical Description
Colorless liquid with a pleasant odor.
Molecular Weight
100.2
Boiling Point
242°F
Freezing Point
-120°F
Solubility
2%
Vapor Pressure
16 mmHg
Ionization Potential
9.30 eV
Specific Gravity
0.80
Flash Point
64°F
Upper Exposive Limit
(200°F): 8.0%
Lower Explosive Limit
(200°F): 1.2%
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities
Strong oxidizers, potassium tert-butoxide
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, mucous membrane; headache, narcosis, coma; dermatitis; In Animals: liver, kidney damage
Target Organs
Eyes, skin, respiratory system, central nervous system, liver, kidneys
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:Water flush promptly
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

NIOSH

Up to 500 ppm:
(APF = 10) Any chemical cartridge 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 = 50) Any powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s)*
(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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0511   MEDICAL TESTS: 0134

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