Benzidine

Description

Benzidine · CAS 92-87-5 · C12H12N2. UNII 2X02101HVF. Boiling Point: 752 °F at 740 mmHg (NTP, 1992); Boiling Point: 401 °C; Boiling Point: 401 °C @760 [mm Hg].

Identification

Computed Descriptors

Physical & Chemical Properties

Physical description & handling notes

• Benzidine appears as a grayish-yellow to grayish-red, crystalline solid. Toxic by ingestion, inhalation, and skin absorption. Combustion produces toxic oxides of nitrogen. Used to make other chemicals and in chemical and biological analysis.
• Grayish-yellow, reddish-gray, or white crystalline powder. Note: Darkens on exposure to air and light; [NIOSH]
• Solid
• COLOURLESS OR REDDISH CRYSTALLINE POWDER. TURNS DARK ON EXPOSURE TO AIR AND LIGHT.
• Grayish-yellow, reddish-gray, or white crystalline powder. [Note: Darkens on exposure to air and light.]
• White or slightly-reddish, crystalline powder

GHS Hazard Classification

Documented Uses

• The predominant use for benzidine is in the production of dyes, especially azo dyes in the leather, textile, and paper industries.
• Benzidine is no longer produced for commercial sale in the United States. In 1973, OSHA regulations effectively banned United States production of benzidine. Any benzidine production must be for captive consumption (in-house use), and it must be maintained in closed systems under stringent workplace controls. . . . The predominant use of benzidine is in the production of dyes, especially azo dyes in the leather, textile, and paper industries. The Color Index lists over 300 colors of benzidine-derived dyes, some 18
• Not produced for commercial sale in the United States since 1974; however, benzidine can be imported and small amounts are still used to make benzidine-based dyes; [ACGIH] See 29CFR1910.1003;
• Pulp and Paper Processing [Category: Industry]
• Leather Tanning and Processing [Category: Industry]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]

Synonyms

BENZIDINE; 92-87-5; [1,1'-Biphenyl]-4,4'-diamine; 4,4'-Diaminobiphenyl; p-Diaminodiphenyl; 4,4'-Bianiline; 4,4'-Biphenyldiamine; biphenyl-4,4'-diamine; p,p'-Diaminobiphenyl; 4,4'-Diaminodiphenyl; 4-(4-aminophenyl)aniline; p,p-Bianiline; 4,4'-Biphenylenediamine; 4,4'-Diphenylenediamine; Fast Corinth Base B; p,p'-Dianiline

Frequently Asked Questions

What are the CAS number and molecular formula of Benzidine?

CAS 92-87-5; molecular formula C12H12N2; molecular weight — g/mol.

What other names is Benzidine known by?

BENZIDINE, 92-87-5, [1,1'-Biphenyl]-4,4'-diamine, 4,4'-Diaminobiphenyl, p-Diaminodiphenyl, 4,4'-Bianiline.

Is Benzidine classified as hazardous?

Hazard statements reported: H302, H350, H400, H410, H341.

What are the key physical properties of Benzidine?

Boiling Point: 752 °F at 740 mmHg (NTP, 1992); Boiling Point: 401 °C; Boiling Point: 401 °C @760 [mm Hg]; Boiling Point: 752 °F.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.

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