ASTM D4812 Standard Test Method for Young’s Modulus, Tangent Modulus, and Chord Modulus

ASTM D4812 Test method determines plastics' resistance to flexural shock by extracting energy from pendulum-type hammers breaking specimens with one Pendulum swing. The result of this test method is reported as energy absorbed per unit specimen width.


Introduction ASTM D4812

Unnotched test specimens are employed in this test procedure, which sets it apart from others of a similar kind.  This test method is especially helpful for reinforced materials because it doesn’t have a notch, which can obscure the effects of orientation. Other filled or unreinforced materials may also be utilized with it if a stress-concentrating notch is not needed. It is not valid for materials that twist when subjected to this test.

The significance of this test method encompasses considerable value for quality assurance and material specification. The fact that a material absorbs twice as much energy as another under certain testing settings does not guarantee that the relationship will remain true under different test conditions.

ASTM D4812 Test Procedure 

Specimen SelectionUnless the sheets are known to be isotropic, specimens for sheet materials must be cut from the sheet both longitudinally and across. The thickness of the sheet must match the width of the test specimen.
Test Setup and ExecutionThe test setup involves using standardized machines equipped with pendulum-type hammers. Standard specimens of the plastic material are carefully positioned for testing. The pendulum is released to swing and strike the specimen, generating flexural shock. The energy extracted from the pendulum is measured, providing an indication of the material’s resistance to breakage.

ASTM D4812 Test Specimens 

Specimen DetailsTwisting, distortion, nicks, scratches, pits, or sink marks on any test specimen are avoided. Any test specimen that deviates noticeably or quantifiably from one or more of these standards must be discarded.
Specimen dimensionsUnless specifically noted, test specimens shall have the following dimensions:  Depth—12.70 6 0.15 mm (0.500 6 0.006 in.), Length—63.50 mm (2.500 in.), max, 60.30 mm (2.375 in.), min, and Preferred Width—3.17 6 0.13 mm (0.125 6 0.00

ASTM D4812 Test Results 

ASTM D4812 tests the unnotched cantilever beam impact resistance of plastics, assessing their ability to resist fracture or failure under specific impact forces. Results include maximum force, energy absorption, and visible damage. This helps in material selection and product design for impact-resistant applications.

Tests Related to ASTM D4812 

Important tests relevant  to ASTM D4812 include ASTM D638 for the tensile properties of plastics, ASTM D6110 (Standard Test Method for Determining the Charpy Impact Resistance of Notched Specimens of Plastics) and ASTM D3763 (Standard Test Method for High-Speed Puncture Properties of Plastics Using Load and Displacement Sensors).


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The required number of samples or specimens should comply with the procedure given in the astm d4812 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.

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The turnaround time for astm d4812 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

Where can I get the astm d4812 tested?

You can share your astm d4812 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d4812 test to various testing techniques.

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