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ISO 1656:2019

Rubber, raw natural, and rubber latex, natural — Determination of nitrogen content

Jul 30, 2019

General information

90.93     Jun 14, 2024

ISO

ISO/TC 45/SC 3

International Standard

83.040.10  

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Scope

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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 1656:2014

NOW

PUBLISHED
ISO 1656:2019
90.93 Standard confirmed
Jun 14, 2024