September 2010
NIOSH Publication Number 2010-168c

Methyl isobutyl carbinol

Synonyms & Trade Names
Isobutylmethylcarbinol, Methyl amyl alcohol, 4-Methyl-2-pentanol, MIBC
CAS No.
108-11-2
RTECS No.
SA7350000
DOT ID & Guide
2053 129
Formula
(CH3)2CHCH2CH(OH)CH3
Conversion
1 ppm = 4.18 mg/m3
IDLH
400 ppm
See: 108112
Exposure Limits
NIOSH REL
: TWA 25 ppm (100 mg/m3) ST 40 ppm (165 mg/m3) [skin]
OSHA PEL
†: TWA 25 ppm (100 mg/m3) [skin]
Measurement Methods

NIOSH 7
Physical Description
Colorless liquid with a mild odor.
MW:
102.2
BP:
271°F
FRZ:
-130°F
Sol:
2%
VP:
3 mmHg
IP:
?
Sp.Gr:
0.81
Fl.P:
106°F
UEL:
5.5%
LEL:
1.0%
Class II Combustible Liquid: Fl.P. at or above 100°F and below 140°F.
Incompatibilities & Reactivities
Strong oxidizers
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin; headache, drowsiness; dermatitis; in animals: narcosis
Target Organs
Eyes, skin, central nervous system
Personal Protection/Sanitation
(See protection codes)
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 promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations

NIOSH/OSHA

Up to 250 ppm:
(APF = 10) Any supplied-air respirator*

Up to 400 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

See also: INTRODUCTION   See ICSC CARD: 0665