This specification covers brick intended for both structural and nonstructural masonry where external appearance is not a requirement. The brick are prismatic units available in a variety of sizes@ shapes@ textures@ and colors. The specification does not cover brick intended for use as facing units or where surface appearance is a requirement@ (see Specification C216). This specification does not cover brick intended for use as paving brick (see Specification C902). The property requirements of this standard apply at the time of purchase. The use of results from testing of brick extracted from masonry structures for determining conformance or nonconformance to the property requirements (Section 3) of this standard is beyond the scope of this standard. Brick are manufactured from clay@ shale@ or similar naturally occurring earthy substances and subjected to a heat treatment at elevated temperatures (firing). The heat treatment must develop sufficient fired bond between the particulate constituents to provide the strength and durability requirements of this specification. (See firing@ fired bond@ and incipient fusion in Terminology C43.) Brick are shaped during manufacture by molding@ pressing@ or extrusion@ and the shaping method is a way to describe the brick (see Terminology C43). 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. 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. *A Summary of Changes section appears at the end of this standard.