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ASTM C839-24

Current Revision

Standard Test Method for Compressive Stress of Porcelain Enamels by Loaded-Beam Method

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1.1 This test method covers the measurement of the compressive stresses (Note 1) developed by fired porcelain enamels using the loaded-beam method.

Note 1: Although some may interpret the calculations that are used in this test method as indicating compressive load, it is commonly referred to as compressive stress within the porcelain enamel industry.

1.2 This test method is limited to the use of the loaded-beam method. However, this method includes charts (Fig. 1 and Fig. 2) that provide for conversion of loaded-beam test results to warp and ring stress values.

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.


4.1 All porcelain enamel coatings or glass coatings are by necessity under some degree of compression at room temperature. The desired degree of compression or stress depends upon the type of ware and the end use of the item. Some method of determining relative compressive stress of enamels is necessary to establish the suitability of an enamel for a proposed application.

SDO ASTM: ASTM International
Document Number C839
Publication Date Nov. 1, 2024
Language en - English
Page Count 7
Revision Level 24
Supercedes
Committee B08.12
Publish Date Document Id Type View
Nov. 1, 2024 C0839-24 Revision
Nov. 1, 2020 C0839-82R20 Reaffirmation
May 1, 2015 C0839-82R15 Reaffirmation
April 1, 2010 C0839-82R10 Reaffirmation
Sept. 15, 2005 C0839-82R05 Reaffirmation
Oct. 10, 1999 C0839-82R99 Reaffirmation