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Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:
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ASTM C158 testing covers the determination fo the modulus of rupture in bending of glass and glass-ceramics.
This procedure has methods for testing modulus of rupture of flat glass and comparative testing for modulus of rupture of glass and glass-ceramics.
Test specimens are inserted into the four-point bend fixture and loaded at a constant rate. A deflectometer is placed at the center of the specimen in order to measure deflection and strain at center-span throughout the test.
The calculated modulus of rupture is considered a valid measure of tensile strength.
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Reference: ASTM C158 â€“ Standard Test Methods for Strength of Glass by Flexure (Determination of Modulus of Rupture)