ASTM-C829 2010

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C829-81(2010) Standard Practices for Measurement of Liquidus Temperature of Glass by the Gradient Furnace Method

Published By	Publication Date	Number of Pages
ASTM	2010	9

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Categories: 81.040.10 - Raw materials and raw glass, ASTM

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Description

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 1These 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.

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PDF Pages	PDF Title
1	Scope Referenced Documents Significance and Use Apparatus
2	FIG. 1 FIG. 2 FIG. 3
3	FIG. 4 FIG. 5 FIG. 6
4	Preparation of Test Specimens Procedure FIG. 7
5	FIG. 8 FIG. 9
6	FIG. 10 FIG. 11
7	Surface Crystallization Report Precision and Bias Keywords A1. DESCRIPTION OF LIQUIDUS FURNACE COMPONENTS A1.1 Components for Liquidus Furnace Used in Method A (see FIG. 12
9	A2. CARE OF THE PLATINUM TRAYS A2.1 A2.2 A2.3 A2.4 A2.5 A2.6

Additional information

Standard Title	C829-81(2010) Standard Practices for Measurement of Liquidus Temperature of Glass by the Gradient Furnace Method
Published Code	ASTM
Publication Date	2010
Pages Count	9
ICS Codes	81.040.10 - Raw materials and raw glass

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ASTM-C829 2010

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