1.1 本规程旨在为航空航天硬件装配和集成中使用的污染控制设施提供设计和施工指南。本指南旨在确保设施在正确使用时满足航空航天硬件和工艺的清洁度要求。目标是限制由于颗粒和分子污染物沉积在飞行硬件表面而造成的污染。 1.2 设施的一个清洁度分类是符合ISO 14644-1和14644-2的空气颗粒浓度。包括符合FED-STD-209E的空气颗粒浓度，以供参考。这种简单的分类不足以描述将支持航天器组装和集成的设施。除了空气中的颗粒浓度外，还必须考虑制造和测试期间延长的硬件暴露时间、硬件对碳氢化合物和其他分子污染物的敏感性以及组装和集成期间不断变化的要求。 1.3 本文规定的指南旨在提供有效限制污染物进入设施的设施，限制设施内产生的污染物，并持续清除正常运行期间产生的气载污染物。一些支撑硬件项目，如起重设备、支架和清鞋器，由于这些项目通常与设施一起购买和安装，在设施设计中可能需要住宿。 1.4 讨论了分子污染物（如碳氢化合物、硅酮和其他化学品）的主动过滤。处理高灵敏度光学器件，特别是红外和低温传感器，可能需要对分子污染物进行主动过滤。微生物污染的控制不包括在内，尽管高效微粒空气（HEPA）过滤将对空气中的细菌、孢子和其他通常携带在粒径为0的颗粒上的活性污染物提供一定的控制。 3μm及以上。放射性污染的控制和非常危险材料（如推进剂、强酸或焦散物或致癌物）的容纳没有得到解决。 1.5 任何设施都无法补偿设施内产生的过度污染。除了有效的设施设计外，用户还必须制定日常维护计划（见实践 E2042年 )对于设施，以及限制污染物通过入口门转移和设施内污染物生成的人员和操作规程。 1.6 本规程仅涉及设施设计中的污染控制指南。必须按照所有强制性政府和监管建筑和安全规范执行。可在IEST-RP-CC012中找到相关洁净室标准和美国建筑规范和标准的参考资料。 1.7 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.7.1 括号中给出的值仅供参考，不被视为标准值。 1.8 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。 1.9 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 本规程描述并定义了在设计和制造用于航空航天操作和制造的洁净室或受控区域时应考虑的因素。 根据本文的建议，应提供更能满足性能要求的设施，并为在此类设施中制造和加工的物体提供防污染保护。

1.1 The purpose of this practice is to provide design and construction guidelines for contamination controlled facilities used in the assembly and integration of aerospace hardware. The guidelines herein are intended to ensure that the facilities, when used properly, will meet the cleanliness requirements of aerospace hardware and processes. The objective is to limit contamination due to the deposition of particulate and molecular contaminants on flight hardware surfaces. 1.2 One cleanliness classification of a facility is the airborne particle concentrations in accordance with ISO 14644-1 and 14644-2. Airborne particle concentrations in accordance with FED-STD-209E are included for reference. This simple classification is inadequate to describe a facility that will support the assembly and integration of spacecraft. The extended duration of hardware exposure during fabrication and testing, the sensitivity of the hardware to hydrocarbons and other molecular contaminants, and the changing requirements during assembly and integration must be considered in addition to the airborne particle concentrations. 1.3 The guidelines specified herein are intended to provide facilities that will effectively restrict contaminants from entering the facility, limit contamination generated by and within the facility, and continuously remove airborne contaminants generated during normal operations. Some items of support hardware, such as lifting equipment, stands, and shoe cleaners, are addressed since these items are often purchased and installed with the facility and may require accommodation in the design of the facility. 1.4 Active filtration of molecular contaminants (such as hydrocarbons, silicones, and other chemicals) is discussed. Such active filtration of molecular contaminants may be required for the processing of highly sensitive optical devices, especially infrared and cryogenic sensors. Control of microbiological contamination is not included although HEPA (High Efficiency Particulate Air) filtration will provide some control of airborne bacteria, spores, and other viable contaminants that are typically carried on particles of sizes 0.3 μm and larger. Control of radioactive contamination and accommodation of very hazardous materials such as propellants, strong acids or caustics, or carcinogens are not addressed. 1.5 No facility will compensate for excessive contamination generated inside the facility. In addition to an effective facility design, the user must also institute a routine maintenance program (see Practice E2042 ) for the facility, and personnel and operational disciplines that limit the transfer of contaminants through entry doors and contaminant generation inside the facility. 1.6 This practice only addresses guidelines for contamination control in facility design. It must be implemented in compliance with all mandatory government and regulatory building and safety codes. References to related cleanroom standards and U.S. building codes and standards may be found in IEST-RP-CC012. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7.1 The values given in parentheses are provided for information only and are not considered standard. 1.8 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. 1.9 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 This practice describes and defines factors to be taken into consideration when designing and fabricating a cleanroom or controlled area that is used for aerospace operations and fabrication. Following the suggestions herein should provide a facility that is more capable of meeting performance requirements and that will offer protection against contamination for objects fabricated and processed in such a facility.