1.1 本规范涵盖了各种等级的无水煅烧石膏，称为石膏基恩水泥，设计用于石膏石膏的底涂层和面漆。 注1: 通过添加其他材料，凝固时间加快。 注2: 基恩水泥通常有快速凝固和标准凝固两种类型。然而，可以使用不同细度和凝结时间的不同等级的石膏基恩水泥。除细度和凝固时间外，用于scagliola铸件和其他特殊用途的牌号应在所有方面符合本规范的要求。 1.2 以英寸-磅或国际单位制（公制）表示的数值应单独视为标准值。 在文本中，国际单位显示在括号中。每个系统中规定的值应独立于其他系统使用。两个系统的值不得合并。 1.3 本标准的文本引用了提供解释材料的注释和脚注。这些注释和脚注不应视为本标准的要求。 1.4 以下安全隐患警告仅适用于本规范附录中的试验方法: 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。

1.1 This specification covers various grades of anhydrous calcined gypsum known as gypsum Keene's cement, designed for use in the base and finish coats of gypsum plaster. Note 1: The setting time is accelerated by the addition of other materials. Note 2: Keene's cements are generally available as quick-setting and standard-setting types. However, various grades of gypsum Keene's cement of different fineness and setting time are available. Grades intended for use in scagliola castings and other special purposes should conform to the requirements of this specification in all respects except fineness and setting time. 1.2 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independently of the other. Values from the two systems shall not be combined. 1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes shall not be considered as requirements of the standard. 1.4 The following safety hazards caveat pertains only to the test method in the appendix 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. 1.5 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.