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ASTM F394 Modulus of Rupture (Biaxial Flexure Strength) of Ceramic Substrates

ASTM F394 Test Fixure

Many turn to testing standards such as ASTM F394 to determine the modulus of rupture for their thin ceramic materials. This testing method provides a calculation of biaxial flexure strength for specimens in the as-fired condition or to test pieces prepared to have a certain thickness or surface finish.


For ASTM F394, take a thin circular disk specimen of the ceramic and rest it on three symmetrically spaced points near its periphery. The specimen will be bent in a cupping fashion by a test machine applying force to the center of the disk through a cylindrical ram. The force is applied to the ram at a constant rate in a compression test machine until the specimen breaks. The dimensions and elastic contents of the specimen, breaking load, and the radii of the support and load are used to calculate the maximum tensile stress which is at the center of the tension (convex) surface.

Equipment Needed

TestResources provides Electromechanical Compresion Test Machines mounted with biaxial flexure fixtures to precisely test your thin ceramic material. Call today for help with creating the best budget and test machine according to ASTM D3039.

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