Summary of Test
ASTM C158 describes two test methods to calculate the tensile strength of glass and ceramics, used in commercial and residential construction projects. Both test methods measure the modulus of rupture to determine the highest load level a specimen can tolerate before it breaks. Test Method A assesses the modulus of rupture of flat glass, while Test Method B compares the modulus of rupture in specimens with rectangular or elliptical cross sections.
Before conducting ASTM C158, it is important to read the entire specification in the relevant ASTM publication.
Recommended Equipment
Testing Procedure
Test Method A
- Refer to the standard for the proper way to cut, size, count and prepare the specimen. The standard requires a group of 30 or more specimens taken from several different sheets or regions of a larger sheet.
- Position the specimen in the bend fixture.
- Apply load to the specimen as specified in the testing standard for annealed glass and prestressed glass, until the specimen breaks.
- Follow the directions to identify where the point of failure occurred.
Test Method B
- Refer to the standard for the proper preparation of the specimen.
- Measure the specimen as described in the test procedure.
- Secure the specimen in the bend fixture.
- Apply load to the specimen as specified in the testing standard until the specimen breaks.
Just Ask!
Questions about running ASTM C158 on your system?
