1.1 本规程描述了在含有可吸入结晶二氧化硅的环境中，为降低人类有害职业暴露的风险而应采取的几种措施。本规程适用于但不限于美国矿山安全与健康管理局（MSHA）和美国职业安全与健康管理局（OSHA）监管的行业。为建筑业的独特条件设计的单独实践已被指定为实践 E2625 . 1.2 本惯例中的任何内容均不得解释为要求采取违反任何联邦、州或其他监管机构的任何法规或要求的任何行动。 1.3 单位- 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.4 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。 ====意义和用途====== 4.1 这些做法和标准是为职业暴露制定的。它们旨在( 1. )防止接触可吸入结晶二氧化硅导致临床疾病( 2. )可通过有效、可复制且随时可用的技术进行测量，以及( 3. )可通过现有技术和保护实践实现。

1.1 This practice covers a description of several actions that should be taken to reduce the risk of harmful occupational exposures to humans in environments containing respirable crystalline silica. This practice is intended for, but not limited to, industries regulated by the U.S. Mine Safety and Health Administration (MSHA) and the U.S. Occupational Safety and Health Administration (OSHA). A separate practice designed for the unique conditions of the construction industry has been designated Practice E2625 . 1.2 Nothing in this practice shall be interpreted as requiring any action that violates any statute or requirement of any federal, state, or other regulatory agency. 1.3 Units— The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.4 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. ====== Significance And Use ====== 4.1 These practices and criteria were developed for occupational exposures. They are intended to ( 1 ) protect against clinical disease from exposure to respirable crystalline silica, ( 2 ) be measurable by techniques that are valid, reproducible, and readily available, and ( 3 ) be attainable with existing technology and protective practices.