Rubber, raw natural - Determination of plasticity retention index (PRI)
|Publication Date:||1 August 2017|
|ICS Code (Latex and raw rubber):||83.040.10|
This document specifies a method for determining the plasticity retention index (PRI) of raw natural rubber.
The PRI is a measure of the resistance of raw natural rubber to thermal oxidation. A high resistance to thermal oxidation is shown as a high value of the index. PRI is not an absolute value and cannot give an absolute classification of plasticity number of different natural rubber after oxidation.