1.1 本规范涵盖了在磨机中与其他成分混合的煅烧石膏，以控制工作质量和凝结时间；专门设计为单板抹灰，用于单板抹灰、砌体或混凝土表面的石膏基底，最大厚度为 1. / 4. （6.4毫米），提供准备装饰的表面。 注1: 规范 C843 包含石膏贴面抹灰的应用程序。 1.2 本规范涵盖了测定石膏贴面灰泥物理性能的试验方法，并规定了必须满足的最低要求。 1.3 以英寸-磅单位表示的值应被视为标准值。括号中给出的值是对国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本标准的文本引用了提供解释性材料的注释和脚注。 这些注释和脚注不应被视为标准的要求。 1.5 以下安全隐患警告仅适用于第节“试验方法”部分 5. 根据本规范: 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 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 calcined gypsum mixed at the mill with other ingredients to control working quality and setting time; specifically designed as a veneer plaster to be applied over gypsum base for veneer plasters, masonry or concrete surfaces to a maximum thickness of 1 / 4 in. (6.4 mm) providing a surface ready for decoration. Note 1: Specification C843 contains application procedures for gypsum veneer plaster. 1.2 This specification covers test methods for determining the physical properties of gypsum veneer plasters and sets forth minimum requirements that must be met. 1.3 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. 1.4 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard. 1.5 The following safety hazards caveat applies only to the Test Methods portion, Section 5 of this specification: 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.