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ASTM C24-09

Current Revision

Standard Test Method for Pyrometric Cone Equivalent (PCE) of Fireclay and High-Alumina Refractory Materials

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1.1 This test method covers the determination of the Pyrometric Cone Equivalent (PCE) of fire clay, fireclay brick, high alumina brick, and silica fire clay refractory mortar by comparison of test cones with standard pyrometric cones under the conditions prescribed in this test method.

1.2 UnitsThe 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.

1.2.1 ExceptionsCertain weights are in SI units with inch-pound in parenthesis. Also, certain figures have SI units without parenthesis. These SI units are to be regarded as standard.

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.


The deformation and end point of a cone corresponds to a certain heat-work condition due to the effects of time, temperature, and atmosphere.

The precision of this test method is subject to many variables that are difficult to control. Therefore, an experienced operator may be necessary where PCE values are being utilized for specification purposes.

PCE values are used to classify fireclay and high alumina refractories.

This is an effective method of identifying fireclay variations, mining control, and developing raw material specifications.

Although not recommended, this test method is sometimes applied to materials other than fireclay and high alumina. Such practice should be limited to in-house laboratories and never be used for specification purposes.

SDO ASTM: ASTM International
Document Number C24
Publication Date March 1, 2009
Language en - English
Page Count 4
Revision Level 09
Supercedes
Committee C08.02
Publish Date Document Id Type View
March 1, 2009 C0024-09 Revision
Feb. 10, 2001 C0024-01 Revision
Nov. 1, 2022 C0024-09R22 Reaffirmation
Feb. 1, 2018 C0024-09R18 Reaffirmation
Sept. 1, 2013 C0024-09R13 Reaffirmation
March 1, 2006 C0024-01R06 Reaffirmation
Feb. 10, 2001 C0024-89R99E01 Reaffirmation