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ISO 2930
M00000536
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ISO 2930 5th Edition, August 1, 2017 Rubber, raw natural - Determination of plasticity retention index (PRI)
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Description / Abstract:
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.