ASTM C336 - 71(2020)

    Standard Test Method for Annealing Point and Strain Point of Glass by Fiber Elongation

    Active Standard ASTM C336 | Developed by Subcommittee: C14.04

    Book of Standards Volume: 15.02


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    Significance and Use

    4.1 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. Scope

    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)2 (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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    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.


    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

    C338 Test Method for Softening Point of Glass

    C598 Test Method for Annealing Point and Strain Point of Glass by Beam Bending


    ICS Code

    ICS Number Code 81.040.10 (Raw materials and raw glass)

    UNSPSC Code

    UNSPSC Code


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/C0336-71R20

    Citation Format

    ASTM C336-71(2020), Standard Test Method for Annealing Point and Strain Point of Glass by Fiber Elongation, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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