ASTM D3124-98(2011)
Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry

Standard No.

ASTM D3124-98(2011)

Release Date

1998

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D3124-98(2019)

Latest

ASTM D3124-98(2019)

Scope

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, RR′C = CH₂; and vinyl unsaturation, R - CH = CH₂, also referred to as terminal unsaturation.

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.

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

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).

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

Note 18212;There is no known ISO equivalent to this standard.

ASTM D3124-98(2011) Referenced Document

• ASTM D1505 Standard Test Method for Density of Plastics by the Density-Gradient Technique
• ASTM D1898 
• ASTM D792 Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
• ASTM E131 Standard Definitions of Terms and Symbols Relating to Molecular Spectroscopy
• ASTM E168 Standard Practices for General Techniques of Infrared Quantitative Analysis*， 1999-04-19 Update
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• ASTM E275 Standard Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near-Infrared Spectrophotometers
• IEEE/ASTM SI 10 American National Standard for Metric Practice

ASTM D3124-98(2011) history

• 2019 ASTM D3124-98(2019) Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry
• 1998 ASTM D3124-98(2011) Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry
• 2003 ASTM D3124-98(2003) Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry
• 1998 ASTM D3124-98 Standard Test Method for Vinylidene Unsaturation in Polyethylene by Infrared Spectrophotometry