Butylated hydroxytoluene

  • BHT
  • 2,6-Di-tert-butyl-4-methylphenol
  • 2,6-di-tert-Butyl-p-cresol
Formula
2,6-[(CH3)3C]2-4-(CH3)C6H2OH
Structure
Description
White to pale yellow crystalline solid, slight phenolic odor.
Uses
antioxidant

Registry Numbers and Inventories.
CAS
128-37-0
EC (EINECS/ELINCS)
204-881-4
EC Class
dangerous for the environment
R 22 36/38
S 26 36/37/39
RTECS
GO7875000
RTECS class
Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
UN (DOT)
3077
Merck
13,1547
Beilstein/Gmelin
1911640
Beilstein Reference
4-06-00-03511
EPA OPP
22105
Swiss Giftliste 1
G-2202
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C15H24O
Formula mass
220.36
Melting point, °C
69 - 70
Boiling point, °C
265
Vapor pressure, mmHg
0.006 (25 C)
Vapor density (air=1)
7.6
Saturation Concentration
13 ppm (0.001%) at 20 C (calculated)
Density
1.069 g/cm3 (19.85 C)
Solubility in water
0.6 mg/L
Viscosity
3.47 centistokes at 0C
Refractive index
1.4859 (75 C)
pKa/pKb
12.75 (pKa)
Partition coefficient, pKow
5.32
Heat of fusion
19.87 kJ/mol
Heat of vaporization
52.2 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Do not store in direct sunlight. Keep container closed when not in use.
Handling
Wash thoroughly after handling. Wash hands before eating. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with skin and eyes. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container. Reduce airborne dust and prevent scattering by moistening with water. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Acid chlorides, acid anhydrides, oxidizing agents, bases, steel (corrodes it), brass, copper, copper alloys, and direct sunlight.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
118
Autoignition, °C
345
Upper exp. limit, %
4.9
Lower exp. limit, %
0.5
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Water spray may cause frothing. Use dry chemical or carbon dioxide.
Fire potential
This chemical is combustible.
Health
2
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV: ppm; 10 mg/m3 (ACGIH 1992-1993). NIOSH REL: TWA 10 mg/m3
Poison_Class
4
Exposure effects
May cause reproductive and fetal effects.
   Ingestion
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed.
   Inhalation
Causes respiratory tract irritation.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
3077
Response guide
HS Code
2907 19 00