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ISO 1656:2019

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

Publication date:   Jul 30, 2019

General information

90.92   Standard to be revised   Jan 8, 2025

ISO

ISO/TC 45/SC 3 Raw materials (including latex) for use in the rubber industry

International Standard

83.040.10   Latex and raw rubber

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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WITHDRAWN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
90.92 Standard to be revised
Jan 8, 2025

REVISED BY

IN_DEVELOPMENT
ISO/CD 1656