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ASTM D621

64th Edition, 1976

Complete Document

Standard Test Methods for Deformation of Plastics Under Load

Includes all amendments and changes through Editorial Change 1, March 1988


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Product Details:

  • Revision: 64th Edition, 1976
  • Published Date: March 1988
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 7
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

These test methods cover the determination of the deformation under compression of nonmetallic sheet and molded plastic materials, of all classes and all commercial thicknesses, intended for structural and insulating purposes. Two test methods are included, as follows:

Test Method A—For rigid plastics.

Test Method B—For nonrigid plastics.

The word deformation is used herein in the broad sense to cover (1) dimensional change due almost entirely to flow, and (2) dimensional change due to a combination of flow and shrinkage caused by loss of water or other volatile matter. The word flow as used in these test methods may describe either plastic or elastic defonnation or combinations thereof.

NOTE 1—The values slated in Sl units are to be regarded as the standard.

NOTE 2—Methyl methacrylate and polystyrene are examples of materials that deform almost entirely by flow. Cellulose acetate, cellulose acetate butyrate, phenolic laminated fiber, and vulcanized fiber are examples of materials that deform by a combination of flow and shrinkage.

This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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.