Butylated hydroxytoluene

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A white, crystalline solid. Butylated hydroxytoluene (BHT) is an antioxidant used in rubber and plastic. It can oxidize to form a dark yellow oily liquid which then migrates to the surface of its plastic or rubber.

Synonyms and Related Terms

BHT; di-tert-butyl-para-cresol; 2,6-Bis(1,1-dimethylethyl)-4-methylphenol; Antrancine 8; Tenox BHT; Ionol CP; Vianol; Dalpac

Chemical structure

Butylated hydroxytoluene.jpg


  • Slightly toxic by inhalation, ingestion and contact.
  • Combustible. Flash point = 127C
  • Yellows severely with age.
  • May decompose to an oily film that migrates from plastics.
  • Fisher Scientific: SDS

Physical and Chemical Properties

Soluble in toluene, methanol, ethanol, isopropanol, methyl ethyl ketone, acetone, Cellosolve® and most hydrocarbon solvents. Insoluble in water.

Composition [C(CH3)3]2CH3C6H2OH
CAS 128-37-0
Melting Point 70 C
Density 1.048 g/ml
Molecular Weight mol. wt. = 220.34
Refractive Index 1.4859
Boiling Point 265 C

Resources and Citations

  • Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 274
  • Pam Hatchfield, Pollutants in the Museum Environment, Archetype Press, London, 2002
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: 1521