ASTM C 67/C 67Ma:2023

1.1 These test methods cover procedures for the sampling and testing of brick and structural clay tile. Although not necessarily applicable to all types of units, tests include modulus of rupture, compressive strength, absorption, saturation coefficient, effect of freezing and thawing, efflorescence, initial rate of absorption and determination of weight, size, warpage, length change, and void area. (Additional methods of test pertinent to ceramic glazes include imperviousness, chemical resistance, opacity, and resistance to crazing. 1.2 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. Note 1: The testing laboratory performing this test method should be evaluated in accordance with Practice C1093 . 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.4 These test methods include the following sections: Section Heading Section Scope 1 Referenced Documents 2 Terminology 3 Sampling 4 Specimen Preparation 5 Modulus of Rupture (Flexure Test) 6 Compressive Strength 7 Absorption 8 Freezing and Thawing 9 Initial Rate of Absorption (Suction) (Laboratory Test) 10 Efflorescence 11 Weight Per Unit Area 12 Measurement of Size 13 Measurement of Warpage 14 Measurement of Length Change 15 Initial Rate of Absorption (Suction) (Field Test) 16 Measurement of Void Area in Cored Units 17 Measurement of Void Area in Deep Frogged Units 18 Measurement of Out of Square 19 Measurement of Shell and Web Thickness 20 Breaking Load 21 Imperviousness Test (of Ceramin Glazes) 22 Chemical Resistance Test (of Ceramic Glazes) 23 Autoclaved Crazing Test (of Ceramic Glazes) 24 Opacity Test (of Ceramic Glazes) 25 Precision and Bias 26 Keywords 27 Safety Precautions for Autoclave Equipment and Operation Appendix X1 1.5 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. 1.6 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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