NIOSH Pocket Guide to Chemical Hazards


CAS 128-37-0


RTECS GO7875000
Synonyms & Trade Names
BHT; Butylated hydroxytoluene; Dibutylated hydroxytoluene; 4-Methyl-2,6-di-tert-butyl phenol
DOT ID & Guide


NIOSH REL: TWA 10 mg/m3
OSHA PEL†: none
IDLH N.D. See: IDLH INDEX Conversion
Physical Description
White to pale-yellow, crystalline solid with a slight, phenolic odor. [food preservative]
MW: 220.4
BP: 509°F
MLT: 158°F
Sol: 0.00004%
VP: 0.01 mmHg
IP: ?

Sp.Gr: 1.05
Fl.P: 261°F
UEL: ?
LEL: ?

Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Incompatibilities & Reactivities
Measurement Methods
NIOSH P&CAM226 (II-1); OSHA PV2108
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: Daily

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Fresh air
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations Not available.
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms Irritation eyes, skin; in animals: decreased growth rate, increased liver weight
Target Organs Eyes, skin
See also: INTRODUCTION   See ICSC CARD: 0841