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ASTM C 829 : 1981 : R2010

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

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superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Practices for Measurement of Liquidus Temperature of Glass by the Gradient Furnace Method
Available format(s)

Hardcopy , PDF

Superseded date

11-11-2014

Language(s)

English

Published date

04-01-2010

1 Scope
2 Referenced documents
3 Significance and use
4 Apparatus
5 Preparation of test specimens
6 Procedure
7 Surface crystallization
8 Report
9 Precision and bias
10 Keywords
ANNEXES

CONTAINED IN VOL. 15.02, 2017 Defines procedures for determining the liquidus temperature of a glass 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.

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.

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.

Committee
C 14
DocumentType
Standard Practice
Pages
9
ProductNote
Reconfirmed 2010
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

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