The performance of glass products may be affected by presence of residual stresses due to process, differential thermal expansion between fused components, and by inclusions. This test method provides means of quantitative evaluation of stresses.

1. Scope

1.1 This test method covers the analysis of stress in glass by means of a polarimeter based on the principles developed by Jessop and Friedel (1, 2). Stress is evaluated as a function of optical retardation, that is expressed as the angle of rotation of an analyzing polarizer that causes extinction in the glass.

1.2 There is no known ISO equivalent to this standard.

1.3 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.

ASTM Standards

C162 Terminology of Glass and Glass Products

C770 Test Method for Measurement of Glass Stress--Optical Coefficient

C978 Test Method for Photoelastic Determination of Residual Stress in a Transparent Glass Matrix Using a Polarizing Microscope and Optical Retardation Compensation Procedures

C1426 Practices for Verification and Calibration of Polarimeters

Keywords

glass; optical retardation; polarimeter; stress; Friedel principles; Glass electrical/electronic insulation; Polarimeter method; Retardation; Senarmont polarimeter; Stress cracking tests

ICS Code

ICS Number Code 81.040.01 (Glass in general)

Citing ASTM Standards

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