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ASTM D790 | Plastics and Elastomers | Bend Testing

ASTM D790 is one of the most commonly used specifications in the plastics industry.  This test measures the flexural strength and flexural modulus of reinforced and unreinforced plastics.  These calculations relate to the stiffness of your material and allow you to choose materials that do not bend when supporting the loads you require for your application.  The test uses a universal testing machine and a three point bend fixture to bend plastic test bars to acquire the data needed to make the calculations.

Prior to conducting ASTM D790, it is important to read the entire specification in the relevant ASTM publication.

ASTM D790 | Plastics and Elastomers | Bend Testing

To run the test, begin by die cutting, sawing, or injection molding your samples to a shape specified in the ASTM specification.

  1. Adjust the support span length that you find in the standard determined by your sample size.
  2. Place the test bar on the 3 point bend fixture and begin the test at the rate specified in the standard.
  3. End the test after bending to 5% strain or until the sample breaks.

Calculations:

  • Flexural Stress
  • Flexural Strength
  • Flexural Offset Yield Strength
  • Flexural Stress at Break
  • Stress at Given Strain
  • Flexural Strain
  • Modulus of Elasticity

ASTM D790 | Plastics and Elastomers | Bend Testing

ASTM D790 | Plastics and Elastomers | Bend Testing

ASTM D790 Recommended Equipment
Testing System
Fixturing
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