ASTM C1426-14(2020) PDF

Scope: 1.1 Polarimeters and polariscopes used for measuring stress in glass are described in Test Methods F218, C148, and C978. These instruments include a light source and several optical elements (polarizers, optical retarders, filters, and so forth) that require occasional cleaning, realigning, and calibration. The objective of these practices is to describe the calibration and verification procedures required to maintain these instruments in calibration and ensure that the optical setup is within specification for satisfactory measurements. 1.2 It is mandatory throughout these practices that both verification and calibration are carried out by qualified personnel who fully understand the concepts used in measurements of stress retardation and are experienced in the practices of measuring procedures described in Test Methods F218, C148, and C978. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM C1426-14(2020) Referenced Document

ASTM C148 Standard Test Methods for Polariscopic Examination of Glass Containers*， 2022-07-01 Update
ASTM C162 Standard Terminology of Glass and Glass Products
ASTM C770 Standard Test Method for Measurement of Glass Stressmdash;Optical Coefficient
ASTM C978 Standard Test Method for Photoelastic Determination of Residual Stress in a Transparent Glass Matrix Using a Polarizing Microscope and Optical Retardation Compensation Procedures
ASTM F218 Standard Test Method for Analyzing Stress in Glass

2020 ASTM C1426-14(2020) Standard Practices for Verification and Calibration of Polarimeters
2014 ASTM C1426-14 Standard Practices for Verification and Calibration of Polarimeters
2009 ASTM C1426-09 Standard Practices for Verification and Calibration of Polarimeters
1999 ASTM C1426-99(2004) Standard Practices for Verification and Calibration of Polarimeters
1999 ASTM C1426-99 Standard Practices for Verification and Calibration of Polarimeters