ASTM C158 Flexural Bend Testing for Glass

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ASTM C158 Flexural Bend Testing for Glass

ASTM C158 is a common guideline for bend testing on glass and glass-ceramics. When executed properly, the modulus of rupture from this test method is considered a valid measure of tensile strength. The standard covers two test methods, Method A and B. Method A is designed to include the condition of the surface of the specimen as a factor in the measured strength for flat glass. Method B is applicable to glass specimens of rectangular or elliptical cross sections.


For both Method A and B of ASTM C158, the testing procedure requires a detailed report. Conditions of the surfaces play a large part in the outcome of the modulus of rupture, and therefore the test requires the rate of stressing, test environment, and the area of the specimen subjected to stress to be specified in the test procedure or to be stated in the report.

ASTM C158 can be executed with a universal testing machine. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM C158.