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Pale yellow needles with a disagreeable odor. Mercaptobenzothiazole has been used as a Fungicide in paper (Roberts and Etherington 1982). It is used industrially as a corrosion inhibitor in cutting oils and a Vulcanization accelerator for rubber.

Synonyms and Related Terms

mercapto-benzothiazole; MBT; 2-mercaptobenzothiazole; 2(3H)-benzothiazolethione; 2-benzothiazolethiol; Captax; Dermacid; Mertax; Thiotax; Vulkacit Mercapto; benzothiazole-2-thione

Chemical structure



  • Toxic by ingestion and inhalation.
  • Contact causes irritation
  • Combustible releasing toxic fumes (sulfur and nitrogen oxides).
  • ThermoFisher: SDS

Physical and Chemical Properties =

Soluble in ethanol; ether; acetone, benzene, glacial acetic acid and dilute alkalis. Slightly soluble in carbon tetrachloride and naphtha. Insoluble in water.

Composition C5H4CSC(SH)N
CAS 149-30-4
Melting Point 180.2-181.7 C
Density 1.42 g/ml
Molecular Weight mol. wt. = 167.3

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Matt Roberts, Don Etherington, Bookbinding and the Conservation of Books: a Dictionary of Descriptive Terminology, U.S. Government Printing Office, Washington DC, 1982

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