Rubber, raw—Determination of bound acrylonitrile content in acrylonitrile-butadiene rubber(NBR) Part 2: Kjeldahl method

This standard provides a method for determining the content of bound acrylonitrile in polybutadiene rubber. It specifies the procedures and requirements for the analysis using the Kjeldahl method. The method involves the digestion of the sample with sulfuric acid and catalytic agents, followed by distillation and titration to quantify the nitrogen content. The standard outlines the necessary equipment, reagents, and conditions for accurate and reproducible results. It also includes details on sample preparation and calculation of the acrylonitrile content based on the nitrogen measurement. The procedure is designed to ensure consistency and reliability in the determination of this important property in the material.