BS ISO 2930:2017

This standard BS ISO 2930:2017 Rubber, raw natural. Determination of plasticity retention index (PRI) is classified in these ICS categories:

• 83.040.10 Latex and raw rubber

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.