ASTM-D3194 Standard Test Method for Rubber From Natural Sources—Plasticity Retention Index (PRI)

ASTM-D3194 - 2017 EDITION - CURRENT
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Standard Test Method for Rubber From Natural Sources—Plasticity Retention Index (PRI)
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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.

Significance and Use

4.1 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.

Keywords

natural rubber; plasticity; P.R.I.; retention index;; ICS Number Code 83.040.10 (Latex and raw rubber)

To find similar documents by ASTM Volume:

09.01 (Rubber, Natural and Synthetic -- General Test Methods; Carbon Black)

To find similar documents by classification:

83.040.10 (Latex and raw rubber)

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Document Number

ASTM-D3194-17

Revision Level

2017 EDITION

Status

Current

Modification Type

Revision

Publication Date

Feb. 1, 2017

Document Type

Test Method

Page Count

3 pages

Committee Number

D11.22