ISO-2930 › Rubber, raw natural - Determination of plasticity retention index (PRI)
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ISO 2930:2017 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.
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Aug. 1, 2017
ISO/TC 45/SC 3