Historical
ISO 2930:1995
Rubber, raw natural - Determination of plasticity retention index (PRI)
Cancels and replaces the second edition (1981). 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.
International Organization for Standardization [iso]
