Reference number
ISO 5478:1990
© ISO 2024
ISO 5478:1990
Rubber — Determination of styrene content — Nitration method
Edition 2
1990-11
Retirada
Retirada (Edición 2, 1990)

Resumen

Applicable to all types of styrene-butadiene rubber (SBR) including oil-extended types and also for block copolymers containing up to 50 % (m/m) of styrene. The procedure may give low results when the content of mineral fillers insoluble in nitric acid exceeds 5 % (m/m). The principle is based on the extraction of a test portion with acetone and digestion with nitric acid to oxidize the styrene to p-nitrobenzoic acid. Extraction of the p-nitrobenzoic acid with diethyl ether. Extraction of the p-nitrobenzoic acid from the ether with sodium hydroxide solution and spectrometrical measurement in the ultraviolet spectral region. Cancels and replaces ISO 5478:1980, of which it constitutes a technical revision.

Informaciones generales

  • Estado
     : Retirada
    Fecha de publicación
     : 1990-11
    Etapa
    : Retirada de la Norma Internacional [95.99]
  • Edición
     : 2
    Número de páginas
     : 4
  • Comité Técnico :
    ISO/TC 45/SC 2
    ICS :
    83.060 
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