What is ISO 1656 – Rubber, raw natural, and rubber latex, natural about ?
ISO 1656 specifies a macro-method and a semi-micro method for the determination of nitrogen in raw natural rubber and natural rubber latex using variants of the Kjeldahl process.
The purpose of ISO 1656 is to develop a method of determination of the nitrogen in natural rubber by Kjeldahl process using non-toxic catalyst (no selenium in catalyst mixture). This method is easy to operate, safe and environment-friendly. It also does not need alternative analyser.
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.
Who is ISO 1656 – Rubber, raw natural, and rubber latex, natural for ?