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Significance and Use
These test methods can be used for determining which EPDM polymers are evaluated in the different compounds in Test Methods D3568.
Differences in ethylene sequence distribution cause differences in crystallinity and green strength at the same ethylene content. Since these are important variables in EPM and EPDM processability and end-use properties, the ethylene content of the rubber should not be used as the sole measurement to determine the suitability of a particular rubber for an intended purpose.
1.1 These test methods cover the determination of the proportion of ethylene and propylene units in ethylene-propylene copolymers (EPM) and ethylene-propylenediene terpolymers (EPDM) over the range from 35 to 85 mass % ethylene. Four test methods are needed to encompass the variety of commercial polymers that contain additives or polymerized diene units that interfere with the various infrared peaks. Except when interferences are present, all four test methods should give similar results. The test methods appear in the following order:
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D297 Test Methods for Rubber Products--Chemical Analysis
D3568 Test Methods for Rubber--Evaluation of EPDM (Ethylene Propylene Diene Terpolymers) Including Mixtures With Oil
D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
E168 Practices for General Techniques of Infrared Quantitative Analysis
ICS Number Code 83.040.10 (Latex and raw rubber)
UNSPSC Code 13101725(Ethylene propylene diene EPDM)