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NIOSH

BUTYLATED HYDROXYTOLUENE

ICSC: 0841

2,6-Di-tert-butyl-4-methylphenol
2,6-Di-tert-butyl-p-cresol
BHT
C15H24O / C6H2(OH)(CH3)(C(CH3)3)2
Molecular mass: 220.34
ICSC # 0841 		CAS # 128-37-0
RTECS # GO7875000
March 24, 1999 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Combustible.
NO open flames.
Powder, water spray, foam, carbon dioxide.
EXPLOSION

In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE
PREVENT DISPERSION OF DUST!

•INHALATION Cough. Sore throat.
Local exhaust or breathing protection.
Fresh air, rest. Refer for medical attention.
•SKIN Redness.
Protective gloves.
Remove contaminated clothes. Rinse and then wash skin with water and soap.
•EYES Redness. Pain.
Safety spectacles.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
•INGESTION Abdominal pain. Confusion. Dizziness. Nausea. Vomiting.
Do not eat, drink, or smoke during work.
Rinse mouth. Rest. Refer for medical attention.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Sweep spilled substance into containers. Carefully collect remainder, then remove to safe place. Do NOT let this chemical enter the environment. (Extra personal protection: P2 filter respirator for harmful particles).
Separated from strong oxidants, strong bases. Well closed.

ICSC: 0841 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

BUTYLATED HYDROXYTOLUENE

ICSC: 0841

I

M

P

O

R

T

A

N

T


D

A

T

A

PHYSICAL STATE; APPEARANCE:
COLOURLESS TO PALE YELLOW CRYSTALS OR POWDER.

PHYSICAL DANGERS:


CHEMICAL DANGERS:
The substance decomposes on burning and on contact with oxidizing materials.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: Inhalable fraction & vapour 2 mg/m3; A4 (not classifiable as a human carcinogen); (ACGIH 2005).
MAK: (Inhalable fraction) 20 mg/m3;
Peak limitation category: II(2); Carcinogen category: 4; Pregnancy risk group: C;
(DFG 2008).
OSHA PEL†: none
NIOSH REL: TWA 10 mg/m3
NIOSH IDLH: N.D. See: IDLH INDEX


ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its aerosol and by ingestion.

INHALATION RISK:
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20°C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance irritates the eyes and the skin.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
Repeated or prolonged contact with skin may cause dermatitis. The substance may have effects on the liver.

PHYSICAL
PROPERTIES

Boiling point: 265°C
Melting point: 70°C
Density: 1.03-1.05
g/cm3
Solubility in water, g/100 ml at 25°C: 0.00006
Vapour pressure, Pa at 20 °C: 1.3
Relative vapour density (air = 1): 7.6
Flash point: 127°C c.c.
Octanol/water partition coefficient as log Pow: 5.1

ENVIRONMENTAL
DATA

The substance is harmful to aquatic organisms.

N O T E S

Ionol, Antioxidant 4K, Paranox 441, Sustane BHT, Topanol-o-, Tenox BHT, Impruvol, Vulkanox KB are trade names.
Card has been partially updated in November 2008: see Occupational Exposure Limits.

ADDITIONAL INFORMATION



ICSC: 0841 BUTYLATED HYDROXYTOLUENE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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