Active Standard ASTM C1377 | Developed by Subcommittee: C14.08
Book of Standards Volume: 15.02
Historical (view previous versions of standard)
Significance and Use
The strength and performance of heat-strengthened and fully tempered glass is greatly affected by the surface and edge stress induced during the heat-treating process.
The edge and surface stress levels are specified in Specification C 1048
Surface stresses can be measured nondestructively using methods, such as Test Method C 1279
1.1 This test method covers calibration or verification of calibration, or both, of surface-stress measuring devices used to measure stress in annealed and heat-strengthened or tempered glass using polariscopic or refractometry based principles.
1.2 This test method is nondestructive.
1.3 This test method uses transmitted light, and therefore, is applicable to light-transmitting glasses.
1.4 This test method is not applicable to chemically tempered glass.
1.5 Using the procedure described, surface stresses can be measured only on the “tin” side of float glass.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C158 Test Methods for Strength of Glass by Flexure (Determination of Modulus of Rupture)
C162 Terminology of Glass and Glass Products
C770 Test Method for Measurement of Glass Stress--Optical Coefficient
C1048 Specification for Heat-Strengthened and Fully Tempered Flat Glass
C1279 Test Method for Non-Destructive Photoelastic Measurement of Edge and Surface Stresses in Annealed, Heat-Strengthened, and Fully Tempered Flat Glass
ICS Number Code 17.180.30 (Optical measuring instruments); 81.020 (Processes in the glass and ceramics industries)