Dicyclohexyl amine nitrite

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A white crystalline solid. Dicyclohexyl amine nitrite is used as a Vapor phase corrosion inhibitor for Silver, Steel, and Aluminum. It forms a thin protective layer on the surface of the metal which minimizes the transmission of moisture and Oxygen. Dicyclohexyl amine nitrite is marketed as VPI 260 by Shell. It is used in antitarnish wrapping papers.

Synonyms and Related Terms

VPI 260 [Shell]; dicyclohexyl ammonium nitrite; dicyclohexylamine nitrite


  • Skin irritant.
  • Strong oxidizer.
  • Sigma Aldrich: SDS

Physical and Chemical Properties

  • Vapor pressure = 0.00013 at 21C
  • pH of condensate = 10.0
Composition (C6H11)2NH-HNO2
CAS 3129-91-7
Melting Point 182-183 C

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p.67
  • L. Selwyn, 'Historical Silver: Storage, Display and Tarnish Removal', J.IIC-GC, 15, 1990