1.1 本规范涵盖了主要由沙子和石灰制成的砖，用于砖砌体。覆盖了两个等级的砖: 1.1.1 SW级- 用于暴露在低于冰点的温度和潮湿环境中使用的砖。 注1: 作为一个典型的例子，美国东北部地区用于基础层和护墙的砖应符合SW级。 1.1.2 MW级- 用于暴露在低于冰点的温度下但不太可能被水饱和的地方的砖。 注2: 作为一个典型的例子，暴露在护墙或基础以外的墙面上的砖，或用于美国东北部地区霜冻程度较低或气候较干燥地区结构的砖，应符合MW级。 1.1.3 本规范中使用的术语“砖”是指砖或实心砌块。 1.2 如果需要具有特定颜色、纹理、饰面或均匀性的砖，这些特征应由买方单独规定。 1.3 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应被视为本标准的要求。 1.4 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。

1.1 This specification covers brick made principally from sand and lime and intended for use in brick masonry. Two grades of brick are covered: 1.1.1 Grade SW— Brick intended for use where exposed to temperature below freezing in the presence of moisture. Note 1: As a typical example, brick used for foundation courses and parapets in the northeastern quarter of the United States should conform to Grade SW. 1.1.2 Grade MW— Brick intended for use where exposed to temperature below freezing but unlikely to be saturated with water. Note 2: As a typical example, brick exposed in the face of the wall other than parapet or foundations, or brick intended for structures located in regions of the United States characterized by less severe frost action or by drier climate than is found in the northeastern quarter of the United States should conform to Grade MW. 1.1.3 When the term brick is used in this specification, it is understood to mean brick or solid masonry units. 1.2 If brick having a particular color, texture, finish, or uniformity is desired, these features shall be specified separately by the purchaser. 1.3 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. 1.4 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. 1.5 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.