NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Cyclohexane

CAS
110-82-7

C6H12

RTECS
GU6300000
Synonyms & Trade Names

Benzene hexahydride, Hexahydrobenzene, Hexamethylene, Hexanaphthene
DOT ID & Guide
1145 / 128

Exposure
Limits

NIOSH REL: TWA 300 ppm (1050 mg/m3)
OSHA PEL: TWA 300 ppm (1050 mg/m3)
IDLH
1300 ppm [10%LEL] See: 110827
Conversion
1 ppm = 3.44 mg/m3
Physical Description
Colorless liquid with a sweet, chloroform-like odor. [Note: A solid below 44°F.]
MW: 84.2
BP: 177°F
FRZ: 44°F
Sol: Insoluble
VP: 78 mmHg
IP: 9.88 eV

Sp.Gr: 0.78
Fl.P: 0°F
UEL: 8%
LEL: 1.3%

Class IB Flammable Liquid: Fl.P. below 73F and BP at or above 100F.
Incompatibilities & Reactivities

Oxidizers
Measurement Methods
NIOSH 1500; OSHA 7
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
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/OSHA
Up to 1300 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)
(APF = 50) Any chemical cartridge respirator with a full facepiece and 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 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
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin, respiratory system; drowsiness; dermatitis; narcosis, coma
Target Organs
Eyes, skin, respiratory system, central nervous system
See also: INTRODUCTION   See ICSC CARD: 0242   See MEDICAL TESTS: 0062