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ASTM C598-24

Current Revision

Standard Test Method for Annealing Point and Strain Point of Glass by Beam Bending

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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.2 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.3

1.3 The values stated in metric units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 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.


4.1 This test method offers an alternate procedure to Test Method C336 for determining the annealing and strain points of glass. It is particularly recommended for glasses not adaptable to flame working. It also has the advantages that thermal expansion and effective length corrections, common to the fiber elongation method, are eliminated.

4.2 This test method provides data useful for (1) estimating stress release, (2) the development of proper annealing schedules, and (3) estimating setting points for seals. Accordingly, its usage is widespread throughout manufacturing, research, and development. It can be utilized for specification acceptance.

SDO ASTM: ASTM International
Document Number C598
Publication Date Aug. 1, 2024
Language en - English
Page Count 5
Revision Level 24
Supercedes
Committee C14.04
Publish Date Document Id Type View
Aug. 1, 2024 C0598-24 Revision
Aug. 1, 2019 C0598-93R19 Reaffirmation
Oct. 1, 2013 C0598-93R13 Reaffirmation
April 1, 2008 C0598-93R08 Reaffirmation
April 10, 2003 C0598-93R03 Reaffirmation
Oct. 10, 1998 C0598-93R98 Reaffirmation