Reference number
ISO 1656:2019
© ISO 2025
International Standard
ISO 1656:2019
Rubber, raw natural, and rubber latex, natural — Determination of nitrogen content
Edition 5
2019-07
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Published (Edition 5, 2019)
This publication was last reviewed and confirmed in 2024. Therefore this version remains current.

ISO 1656:2019

Language
Format
CHF 132
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Abstract

This document specifies a macro-method and a semi-micro method for the determination of nitrogen in raw natural rubber and in natural rubber latex using variants of the Kjeldahl process.

NOTE The determination of nitrogen in natural rubber is usually carried out in order to arrive at an estimate of the protein content. Minor amounts of non-proteinous nitrogen containing constituents are also present. However, in the dry solids prepared from natural rubber latex, these materials can make a substantial contribution to the total nitrogen content.

General information

  • Status
     : Published
    Publication date
     : 2019-07
    Stage
    : International Standard to be revised [90.92]
  • Edition
     : 5
    Number of pages
     : 21
  • Technical Committee :
    ISO/TC 45/SC 3
    ICS :
    83.040.10 
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Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goal

9
Industry, Innovation and Infrastructure

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