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Standard Test Method for Crazing Resistance of Fired Glazed Ceramic Whitewares by a Thermal Shock Method
NORMA vydaná dňa 1.11.2020
Označenie normy: ASTM C554-93(2020)
Poznámka: NEPLATNÁ
Dátum vydania normy: 1.11.2020
Kód tovaru: NS-1013550
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
crazing resistance, fired glazed ceramic whiteware, thermal shock method,, ICS Number Code 81.060.20 (Ceramic products)
Significance and Use | ||
3.1?Unless there is a proper match between the expansions of the glaze and the body, all glazed whitewares may contain residual stresses from the firing that bonded the glaze to the body. In addition, whitewares are increasingly subjected to thermal stresses in service. Hence, an important use criterion for a glazed whiteware is adequate resistance to repeated abrupt thermal changes. In most cases, the result of inadequate resistance to thermal shock is the appearance of a craze pattern in the glaze. This craze pattern is visible by inspection with oblique lighting and application of a suitable ink or dye. 3.2?This test method is applicable to vitreous whitewares that have negligible crazing as a result of moisture expansion. For nonvitreous and semivitreous bodies, refer to Test Method C424. |
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1. Scope | ||
1.1?This test method covers the determination of the resistance to crazing of fired, glazed, ceramic whitewares when stresses residual after glost firing may cause a tendency to craze, such stresses being induced by factors other than moisture expansion. 1.2?This test is not intended to induce moisture expansion, which fact should be kept in mind if the materials to be evaluated may exhibit moisture expansion. Note 1:?Test Method C424
covers a method for determining resistance to crazing induced by
moisture expansion. Its use is generally confined to testing
nonvitreous and semivitreous ceramic whitewares because these
products may be subject to such expansion. For whitewares with
negligible moisture expansion (such as vitreous and impervious
ware), the thermal shock method described herein is generally to be
preferred.
1.3?The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4?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. 1.5?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. |
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2. Referenced Documents | ||
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