ASTM D2238-22
Standard Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm⁻¹

Standard No.

ASTM D2238-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D2238-22

Scope

1.1 These test methods cover measurement by infrared absorption spectrophotometry of the 1378 cm−1 (7.25 µm) band in polyethylene due to methyl groups. (1, 2, 3-6)2 Two test methods are covered: 1.1.1 Test Method A uses compensation with a standard sample film of known methyl content. 1.1.2 Test Method B uses compensation with a wedge of polymethylene or a polyethylene of known low methyl content. 1.2 These test methods are applicable to polyethylenes of Types I (density 0.910 to 0.925 g/cm3 ), II (density 0.926 to 0.940 g/cm3 ), and III (density 0.941 to 0.965 g/cm3 ). NOTE 1—For determination of density, see Specifications D1505. NOTE 2—In cases of Type III polyethylene with densities greater than 0.950 g/cm3 , different results are obtained with the two test methods. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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 7. NOTE 3—There is no known ISO equivalent to this standard. 1.5 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.

ASTM D2238-22 Referenced Document

• ASTM D1505 Standard Test Method for Density of Plastics by the Density-Gradient Technique
• ASTM D618 Standard Practice for Conditioning Plastics for Testing
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• ASTM E131 Standard Definitions of Terms and Symbols Relating to Molecular Spectroscopy
• ASTM E168 Standard Practices for General Techniques of Infrared Quantitative Analysis
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• IEEE/ASTM SI 10 American National Standard for Metric Practice

ASTM D2238-22 history

• 2022 ASTM D2238-22 Standard Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm⁻¹
• 1992 ASTM D2238-92(2012)e1 Standard Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm^minus;1
• 1992 ASTM D2238-92(2004) Standard Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm
• 1992 ASTM D2238-92(1999) Standard Test Methods for Absorbance of Polyethylene Due to Methyl Groups at 1378 cm