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ASTM D6645-18

Current Revision

Standard Test Method for Methyl (Comonomer) Content in Polyethylene by Infrared Spectrophotometry

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1.1 This test method covers the determination of methyl groups (that is, comonomer content) in polyethylenes by infrared spectrophotometry. The test method is applicable to copolymers of ethylene with 1-butene, 1-hexene, or 1-octene having densities above 900 kg/m3. High-pressure low-density polyethylenes (LDPE) and terpolymers are excluded.

1.2 The values stated in SI units, based on IEEE/ASTM SI-10, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Note 1: There is no known ISO equivalent to this standard.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


5.1 This method determines the number of branches (that is, comonomer content) in copolymers of ethylene with 1-butene, 1-hexene or 1-octene. This information can be correlated with physical properties such as melting point, density, and stiffness, all of which depend on the degree of crystallinity of the polymer. Differences in the comonomer content thus can have a significant effect on the final properties of products made from these resins.

SDO ASTM: ASTM International
Document Number D6645
Publication Date Oct. 1, 2018
Language en - English
Page Count 4
Revision Level 18
Supercedes
Committee D20.70
Publish Date Document Id Type View
Oct. 1, 2018 D6645-18 Revision
March 10, 2001 D6645-01 Revision
Jan. 1, 2010 D6645-01R10 Reaffirmation