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ASTM D3124-98(2019)

Current Reaffirmation

Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry

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1.1 This test method is applicable to all types of polyethylenes, those ethylene plastics consisting of ethylene and α-olefin copolymers longer than propylene, and blends of the above in any ratio.

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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 8.

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 There are three types of olefinic groups present in sufficient concentrations to warrant consideration, one or more of which can normally be found in any polyethylene (4). The three types are: trans-vinylene, R - CH = CH - R, sometimes referred to as transinternal unsaturation; vinylidene or pendent methylene, RRC = CH2; and vinyl unsaturation, R - CH = CH2, also referred to as terminal unsaturation.

5.2 The type and quantity of these groups can influence the chemical and physical properties of the resin. Information concerning their presence may also be used to characterize or identify unknown resins or blends of resins.

5.3 Vinylidene unsaturation represents the major portion of the unsaturation present in most low-density polyethylenes.

5.4 Infrared spectroscopy can be used for the determination of unsaturation in polyethylene (1, 3, 5). The values determined by infrared agree with those determined by IC1 uptake (5).

SDO ASTM: ASTM International
Document Number D3124
Publication Date Nov. 1, 2019
Language en - English
Page Count 4
Revision Level 98(2019)
Supercedes
Committee D20.70
Publish Date Document Id Type View
March 10, 1998 D3124-98 Revision
Nov. 1, 2019 D3124-98R19 Reaffirmation
Feb. 1, 2011 D3124-98R11 Reaffirmation
March 10, 2003 D3124-98R03 Reaffirmation