ASTM C829 - 81(2015)

    Standard Practices for Measurement of Liquidus Temperature of Glass by the Gradient Furnace Method

    Active Standard ASTM C829 | Developed by Subcommittee: C14.04

    Book of Standards Volume: 15.02

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    Significance and Use

    3.1 These practices are useful for determining the maximum temperature at which crystallization will form in a glass, and a minimum temperature at which a glass can be held, for extended periods of time, without crystal formation and growth.

    1. Scope

    1.1 These practices cover procedures for determining the liquidus temperature (Note 1) of a glass (Note 1) by establishing the boundary temperature for the first crystalline compound, when the glass specimen is held at a specified temperature gradient over its entire length for a period of time necessary to obtain thermal equilibrium between the crystalline and glassy phases.

    Note 1: These terms are defined in Terminology C162.

    1.2 Two methods are included, differing in the type of sample, apparatus, procedure for positioning the sample, and measurement of temperature gradient in the furnace. Both methods have comparable precision. Method B is preferred for very fluid glasses because it minimizes thermal and mechanical mixing effects.

    1.2.1 Method A employs a trough-type platinum container (tray) in which finely screened glass particles are fused into a thin lath configuration defined by the trough.

    1.2.2 Method B employs a perforated platinum tray on which larger screened particles are positioned one per hole on the plate and are therefore melted separately from each other.2

    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.

    ASTM Standards

    C162 Terminology of Glass and Glass Products

    Other Document

    NIST Certificate for Liquidus Temperature, SRM 77

    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/C0829-81R15

    Citation Format

    ASTM C829-81(2015), Standard Practices for Measurement of Liquidus Temperature of Glass by the Gradient Furnace Method, ASTM International, West Conshohocken, PA, 2015,

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