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Significance and Use
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.
1.1 This test method covers the determination of the annealing point and the strain point of a glass by measuring the viscous elongation rate of a fiber of the glass under prescribed condition.
1.2 The annealing and strain points shall be obtained by following the specified procedure after calibration of the apparatus using fibers of standard glasses having known annealing and strain points, such as those specified and certified by the National Institute of Standards and Technology (NIST) (see Appendix X1).
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.
C338 Test Method for Softening Point of Glass
C598 Test Method for Annealing Point and Strain Point of Glass by Beam Bending
ICS Number Code 81.040.10 (Raw materials and raw glass)
ASTM C336-71(2010), Standard Test Method for Annealing Point and Strain Point of Glass by Fiber Elongation, ASTM International, West Conshohocken, PA, 2010, www.astm.orgBack to Top