D3194-04(2009) Standard Test Method for Rubber From Natural Sources-Plasticity Retention Index (PRI)
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. Scope
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
ASTM Standards
D1485 Test Methods 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
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