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ASTM D3900-05a(2010)

Historical Reaffirmation

Standard Test Methods for Rubber—Determination of Ethylene Units in Ethylene-Propylene Copolymers (EPM) and in Ethylene-Propylene-Diene Terpolymers (EPDM) by Infrared Spectrometry

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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:


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.

SDO ASTM: ASTM International
Document Number D3900
Publication Date June 1, 2010
Language en - English
Page Count 9
Revision Level 05a(2010)
Supercedes
Committee D11.11
Publish Date Document Id Type View
Oct. 1, 2017 D3900-17 Revision
June 1, 2015 D3900-15 Revision
Dec. 1, 2005 D3900-05A Revision
Oct. 1, 2005 D3900-05 Revision
Nov. 1, 2021 D3900-17R21 Reaffirmation
June 1, 2010 D3900-05AR10 Reaffirmation
Dec. 1, 2004 D3900-95R04E01 Reaffirmation
Jan. 1, 2000 D3900-95R00 Reaffirmation