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Significance and Use
This test method may be used to evaluate the heat and/or oxidation stability (aging) of raw rubber under controlled conditions. High original and aged plasticity values usually correspond to good aging properties. The ratio of the aged to original plasticity values expressed as a percentage, the PRI, is used as an indication of aging.
1.1 This test method gives an indication of the oxidation resistance of raw natural rubber at a specified temperature. This resistance is indicated by the Plasticity Retention Index (PRI), a ratio expressed as a percentage of the aged plasticity to the original plasticity determined by means of a parallel plate plastometer. A low PRI value indicates a poor resistance to oxidation.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1485 Practice for Rubber from Natural Sources--Sampling and Sample Preparation
D3040 Practice for Preparing Precision Statements for Standards Related to Rubber and Rubber Testing
D3182 Practice for Rubber--Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
E145 Specification for Gravity-Convection and Forced-Ventilation Ovens
UNSPSC Code 13101705(Styrene butadiene SBR)