NIOSH Pocket Guide to Chemical Hazards


CAS 25639-42-3


RTECS GW0175000
Synonyms & Trade Names
Hexahydrocresol, Hexahydromethylphenol
DOT ID & Guide
2617 129


NIOSH REL: TWA 50 ppm (235 mg/m3)
OSHA PEL: TWA 100 ppm (470 mg/m3)
IDLH 500 ppm See: 25639423 Conversion 1 ppm = 4.67 mg/m3
Physical Description
Straw-colored liquid with a weak odor like coconut oil.
MW: 114.2
BP: 311-356°F
FRZ: -58°F
Sol: 4%
VP(86°F): 2 mmHg
IP: 9.80 eV

Sp.Gr: 0.92
Fl.P: 149-158°F
UEL: ?
LEL: ?

Class IIIA Combustible Liquid: Fl.P. at or above 140F and below 200F.
Incompatibilities & Reactivities
Strong oxidizers
Measurement Methods
NIOSH 1404
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 or contaminated
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations NIOSH
Up to 500 ppm:
(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
(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, skin absorption, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin, upper respiratory system; headache; in animals: narcosis; liver, kidney damage
Target Organs Eyes, skin, respiratory system, central nervous system, kidneys, liver
See also: INTRODUCTION   See ICSC CARD: 0292