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About This Item
Full Description
1.1 This test method covers the determination of the annealing point and the strain point of a glass by measuring the rate of midpoint viscous bending of a simply loaded glass beam. However, at temperatures corresponding to the annealing and strain points, the viscosity of glass is highly time-dependent. Hence, any viscosities that might be derived or inferred from measurements by this procedure cannot be assumed to represent equilibrium structural conditions.
1.2 The annealing and strain points shall be obtained following a specified procedure after direct calibration of the apparatus using beams of standard glasses having known annealing and strain points such as those supplied and certified by the National Institute of Standards and Technology.
1.3 This test method, as an alternative to Test Method
1.4 The values stated in metric units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 This standard does not purport to address all of the safety problems, 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.
Document History
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ASTM C598-93(2019)
Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending- Most Recent
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ASTM C598-93(2013)
Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending- Historical Version
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ASTM C598-93(2008)
Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending- Historical Version
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ASTM C598-93(2003)
Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending- Historical Version
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ASTM C598-93(1998)
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Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending- Historical Version