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ASTM D790M

1993 Edition, October 15, 1993

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Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials (Metric)



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Product Details:

  • Revision: 1993 Edition, October 15, 1993
  • Published Date: October 15, 1993
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 10
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

These test methods cover the determination of flexural properties of unreinforced and reinforced plastics, including high-modulus composites and electrical insulating materials in the form of rectangular bars molded directly or cut from sheets, plates, or molded shapes. These test methods are generally applicable to rigid and semirigid materials. However, flexural strength cannot be determined for those materials that do not break or that do not fail in the outer fibers. Two test methods are described as follows:

Test Method I—A three-point loading system utilizing center loading on a simply supported beam.

Test Method II—A four-point loading system utilizing two load points equally spaced from their adjacent support points, with a distance between load points of either one third or one half of the support span.

Either test method can be used with the two procedures that follow:

Procedure A, designed principally for materials that break at comparatively small deflections.

Procedure B, designed particularly for those materials that undergo large deflections during testing.

Comparative tests may be run according to either test method or procedure, provided that test method or procedure is found satisfactory for the material being tested.

NOTE 1 — These test methods are the metric counterpart of Test Methods D 790.

This standard does not purport to address all of the safety problems, 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.