ASTM-C621 Standard Test Method for Isothermal Corrosion Resistance of Refractories to Molten Glass

ASTM-C621 - 2009 R22 EDITION - CURRENT
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Standard Test Method for Isothermal Corrosion Resistance of Refractories to Molten Glass
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Scope

1.1 This test method covers the determination of the corrosion resistance of refractories in contact with molten glass under static, isothermal conditions.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are provided for information only.

1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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.

Significance and Use

This test method provides a rapid, inexpensive method for comparing the corrosion resistance of refractories. The isothermal conditions of this test method represent the most severe static corrosion environment possible at the specified test temperature. This test method is suitable for quality control, research and development applications, and for product value studies on similar materials. Tests run at a series of temperatures are often helpful in determining the use temperature limitations of a particular material. Melt-line corrosion results are also a useful indication of relative resistance to both upward and downward drilling corrosion mechanisms. Examination of test specimens also provides information about the tendency for a particular refractory to form stones or other glass defects.

Because this test method is both isothermal and static and since most glass-contact refractories operate in a dynamic system with a thermal gradient, test results do not directly predict service in a furnace. The effects of differing thermal conductivities, refractory thickness, artificial cooling or insulation upon the refractory thermal gradient, and the erosive action of moving molten glass currents are not evaluated with this test.

Keywords

corrosion; crucible; finger; glass; glass-line; cut; iso-thermal; metal-line cut; refractory; static; ICS Number Code 81.080 (Refractories)

To find similar documents by ASTM Volume:

15.01 (Refractories, Activated Carbon; Advanced Ceramics)

To find similar documents by classification:

81.080 (Refractories Including ceramic refractories)

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Document Number

ASTM-C0621-09R22

Revision Level

2009 R22 EDITION

Status

Current

Modification Type

Reapproval

Publication Date

Nov. 9, 2022

Document Type

Test Method

Page Count

6 pages

Committee Number

C08.10