1.1 This specification covers structural clay load-bearing facing tile and facing brick and other “solid masonry units” made from clay, shale, fire-clay, or mixtures thereof, with or without the addition of grog or other mixtures, having a finish consisting of a ceramic glaze fused to the body at above 1500°F (655°C) making them inseparable, excluding natural salt-glazed ware. Two grades, based on permissible variation in face dimensions, and two types are covered, as follows: 1.1.1 Grade S (select), for use with comparatively narrow mortar joints. 1.1.2 Grade SS (select sized or ground edge), for use where variation of face dimension must be very small. 1.1.3 Type I (single-faced units), for general use where only one finished face will be exposed. 1.1.4 Type II (two-faced units), for use where two opposite finished faces will be exposed. 1.2 The property requirements of this specification apply at the time of purchase. The use of results from testing of brick and tile extracted from masonry structures for determining conformance or nonconformance to the property requirements (Section 4) of this standard is beyond the scope of this specification.