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Significance and Use
4.1 The plasticity number and the recovery of the test specimen are related to the flow properties and the elastic properties, respectively, and may be useful in predicting processing characteristics, such as ease of forming and extrusion characteristics.
4.1.1 In this test method, plasticity is measured in an inverse manner, as noted by the final height of the specimen. Thus, high plasticity rubbers (high degree of flow during test) are indicated by a low plasticity number.
1.1 This test method covers the determination of plasticity and recovery of unvulcanized rubber by means of the parallel plate plastometer. Uncompounded, compounded, and reclaim rubber may be tested.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.
D3194 Test Method for Rubber From Natural Sources--Plasticity Retention Index (PRI)
D3767 Practice for Rubber--Measurement of Dimensions
D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
E145 Specification for Gravity-Convection and Forced-Ventilation Ovens
ISO StandardISO 2007 Rubber Unvulcanized--Determination of Plasticity--Rapid Plastimeter Method
ICS Number Code 83.060 (Rubber)
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ASTM D926-08(2013), Standard Test Method for Rubber Property—Plasticity and Recovery (Parallel Plate Method), ASTM International, West Conshohocken, PA, 2013, www.astm.orgBack to Top