IEST RP-CC046 1-2013 Controlled Environments (Aerospace Non-cleanroom).pdf

1、Institute of Environmental Sciences and Technology IEST-RP-CC046.1 Contamination Control Division Recommended Practice 046.1 Controlled Environments (Aerospace, Non-cleanroom) Arlington Place One 2340 S. Arlington Heights Road, Suite 620 Arlington Heights, IL 60005-4516 Phone: (847) 981-0100 Fax: (8

2、47) 981-4130 E-mail: informationiest.org Web: www.iest.org 2 IEST 2013 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-CC046.1 IEST-RP-CC046.1 Institute of Environmental Sciences and Technology IEST 2013 All rights reserved 3 This Recommended Practice is published by t

3、he Institute of Environmental Sciences and Technology to advance the technical and engineering sciences. Use of this document is entirely voluntary, and determination of its applicability and suitability for any particular use is solely the responsibility of the user. Use of this Recommended Practic

4、e does not imply any warranty or endorsement by IEST. This Recommended Practice was prepared by and is under the jurisdiction of Working Group CC046 of the IEST Contamination Control Division. Copyright 2013 by the Institute of Environmental Sciences and Technology First printing, April 2013 ISBN 97

5、8-1-937280-07-9 PROPOSAL FOR IMPROVEMENT: The Working Groups of the Institute of Environmental Sciences and Tech-nology are continually working on improvements to their Recommended Practices and Reference Documents. Sug-gestions from users of these documents are welcome. If you have a suggestion reg

6、arding this document, please use the online Proposal for Improvement form found on the IEST website at www.iest.org. Institute of Environmental Sciences and Technology Arlington Place One 2340 S. Arlington Heights Road, Suite 620 Arlington Heights, IL 60005-4516 Phone: (847) 981-0100 Fax: (847) 981-

7、4130 E-mail: informationiest.org Web: www.iest.org 4 IEST 2013 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-CC046.1 IEST-RP-CC046.1 Institute of Environmental Sciences and Technology IEST 2013 All rights reserved 5 Controlled Environments (Aerospace, Non-cleanroom)

8、IEST-RP-CC046.1 CONTENTS SECTION 1 SCOPE AND LIMITATIONS . 7 2 REFERENCES . 7 3 TERMS AND DEFINITIONS . 8 4 BACKGROUND AND PURPOSE 10 5 CONTAMINATION AND FOD CONTROL PROGRAM . 10 6 CLASSIFICATION OF CONTROLLED ENVIRONMENTS 10 7 FACILITIES REQUIREMENTS . 10 8 EQUIPMENT REQUIREMENTS . 11 9 PROCESS REQ

9、UIREMENTS . 12 10 OPERATION OF CONTROLLED AREAS 12 11 PRODUCT CLEANLINESS 15 12 MONITORING OF CONTROLLED AREAS AND RECORD KEEPING 15 TABLE 1 RECORD OF MAINTENANCE PROCEDURES . 13 6 IEST 2013 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-CC046.1 IEST-RP-CC046.1 Instit

10、ute of Environmental Sciences and Technology IEST 2013 All rights reserved 7 Institute of Environmental Sciences and Technology Contamination Control Division Recommended Practice 046.1 Controlled Environments (Aerospace, Non-cleanroom) IEST-RP-CC046.1 1 SCOPE AND LIMITATIONS 1.1 Scope This Recommen

11、ded Practice (RP) provides non-cleanroom contamination control criteria to support successful performance of products and associated subassemblies, targeted for suppliers of aerospace products. The criteria discussed are intended to assist manufacturers in implementing production methods and process

12、 controls, including minimum facility envi-ronmental controls, not including room airborne parti-cle fallout quantification. This includes production operations from piece-part acquisition through delivery of the final product. This RP is not associated with cleanroom requirements or related documen

13、tation. 1.2 Limitations This document provides a minimum set of require-ments and controls for processes and facilities associated with the assembly, integration, and testing of high-reliability aerospace products that are not required to be produced in cleanrooms. These requirements may be tailored

14、 as appropriate for specific products and processes. However, tailoring must be approved in writing by the contracting organization before work is performed. More stringent contamination control requirements imposed by the contracting documenta-tion take precedence over this document. This document

15、does not address requirements and control features for regulated industries (e.g., phar-maceutical, food, medical). Where the requirements stated in this RP conflict with any requirement in a specification referenced in this RP, the requirements of this RP should apply. 2 REFERENCES The cited editio

16、ns of the following documents are incorporated into this RP to the extent specified here-in. Subsequent revisions of these publications do not automatically supersede the cited editions. Users should investigate the applicability of revised edi-tions of the references. 2.1 American National Standard

17、s Institute (ANSI) ANSI/ESD S.20.20-2007: Protection of Electrical and Electronic Parts, Assemblies and Equipment (Exclud-ing Electrically Initiated Explosive Devices) 2.2 American Society for Testing and Materials (ASTM) ASTM E595: Standard Test Method for Total Mass Loss and Collected Volatile Con

18、densable Materials from Outgassing in a Vacuum Environment ASTM E1548: Standard Practice for Preparation of Aerospace Contamination Control Plans 2.3 Federal and Military Documents MIL-HDBK-406: Contamination Control Technolo-gy: Cleaning Materials for Precision Pre-Cleaning and Use in Cleanrooms an

19、d Clean Work Stations MIL-HDBK-407: Contamination Control Technolo-gy: Precision Cleaning Methods and Procedures TO 00-25-203: Contamination Control of Aerospace Facilities, U.S. Air Force 8 IEST 2013 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-CC046.1 2.4 Institut

20、e of Environmental Sciences and Technology (IEST) IEST-RP-CC003: Garment System Considerations for Cleanrooms and Other Controlled Environments IEST-RP-CC032: Flexible Packaging Materials for Use in Cleanrooms and Other Controlled Environments 2.5 International Organization for Standardization (ISO)

21、 ISO 14644-1: Cleanrooms and associated controlled environmentsPart 1: Classification of air cleanliness 2.6 National Aerospace FOD Prevention, Inc. NAFPI FOD Prevention Guidelines (www.nafpi.nafpiguidline.pdf) 2.7 NASA NASA-JSC-SN-C-0005, Revision D Space Shuttle: Contamination Control Requirements

22、 2.8 Sources and Addresses ANSI American National Standards Institute 25 West 43rd Street New York, New York 10036, USA Phone: 212-642-4900 Fax: 212-398-0023 E-mail: infoansi.org www.ansi.org ASTM International American Society for Testing and Materials 100 Barr Harbor Drive West Conshohocken, Penns

23、ylvania 19428-2959, USA Phone: 610-832-9585 Fax: 610-832-9555 www.astm.org Federal and Military DODSSP The Department of Defense Single Stock Point for Military Specifications, Standards and Related Publications Building 4, Section D 700 Robbins Avenue Philadelphia, Pennsylvania 19111-5098 Phone: 21

24、5 697-6257/6396 Fax: 215 697-9398 http:/www.dodssp.daps.dla.mil IEST Institute of Environmental Services and Technology Arlington Place One 2340 South Arlington Heights Road, Suite 620 Arlington Heights, Illinois 60005-4510 Phone: 847-981-0100 Fax: 847-981-4130 E-mail: informationiest.org www.iest.o

25、rg ISO In US, documents may be ordered from: Institute of Environmental Sciences and Technology Arlington Place One 2340 South Arlington Heights Road, Suite 620 Arlington Heights, Illinois 60005-4516 E-mail: informationiest.org www.iest.org Outside US: Documents available from representa-tive ISO me

26、mber body organization NAFPI National Aerospace FOD Prevention, Inc. 15731 Brayton Street Paramount, California 90723 Phone: 1-800-FOD-1121 http:/ NASA NASA Headquarters Suite 5K39 Washington, DC 20546-000 Phone: (202) 358-0000 Fax: (202) 358-4338 3 TERMS AND DEFINITIONS 3.1 Terms The definitions pr

27、esented here are intended to bring added clarity to selected terms used in this document. Term definitions presented here may diverge from those that may appear in other practices, government specifications, and industry standards. approved source A supplier whose products or processes have been sho

28、wn to be acceptable to the user based on a deter-mination of conformity with principles, practices, and generally recognized standards. active work surface A work surface intended to support (and which may be in direct contact with or adjacent to) contamina-tion sensitive parts, assemblies, products

29、, fixtures, tools, test equipment, and materials that may be in the process of assembly, disassembly, test, inspection, or packaging, or in very short-term storage. IEST-RP-CC046.1 Institute of Environmental Sciences and Technology IEST 2013 All rights reserved 9 cleanroom An enclosed, dedicated spa

30、ce in which the concentra-tion of airborne particles is controlled, and which is constructed to minimize the introduction, generation, and retention of particles and molecular contamina-tion. Other relevant parameters may include, but are not limited to, temperature, humidity, and pressure and may b

31、e controlled as is necessary. contamination The unintended presence of a material (such as parti-cles and molecular films and aerosols) or an energy (such as electromagnetic fields and ionizing radia-tion) that reduces the functionality or reliability of a part, system, or process. The term “contami

32、nation-free” has little useful meaning. Meaningful contami-nation requirements are defined in terms of maximum levels or quantities allowed. controlled environment An environment in which airborne molecular con-tamination, airborne particles, electromagnetic fields, humidity, ionizing radiation, pre

33、ssure, surface con-tamination, static electricity, and temperature are controlled to specified levels. foreign object debris (FOD) A potentially damaging substance, debris, or article alien to a system or process. The concept of FOD differs from contamination. FOD is a macro phenom-enon, whereas con

34、tamination may be present in a micro level. “Zero FOD” or “FOD-free” levels may be realized and specified, whereas contamination levels approaching zero are not practicable. molecular contamination Aerosols and gas-phase molecules that interact with surfaces to form chemical films and droplets that

35、reduce the functionality or reliability of a part, sys-tem, or process. offgassing Evaporation or sublimation of volatile molecular spe-cies from the surface of a material. Offgassing is a surface property of a material and not a bulk property dependent on porosity or diffusion from the mass volume

36、of the material. outgassing Evaporation or sublimation of volatile materials from the volume of a substrate. Outgassing is a bulk prop-erty of the material and is dependent on its porosity and diffusion from the mass volume of the material. particulate contamination Particles in proximity to contami

37、nation sensitive sur-faces that reduce the functionality or reliability of a part, system, or process. unidirectional flow clean work station (UFCWS) A partially enclosed, usually free-standing appliance designed to control particle contamination in a local-ized space by use of high-efficiency parti

38、culate air (HEPA) or ultra-low penetration air (ULPA) filters and a blower. A UFCWS is also known as a flow bench or laminar flow clean work station. Unidirec-tional flow clean work station is the recommended terminology. 3.2 Abbreviations ANSI American National Standards Institute ESD Electrostatic

39、 Discharge FOD Foreign Object Debris HVAC Heating, Ventilation, and Air Conditioning IEST Institute of Environmental Sciences and Technology IEST-RP Institute of Environmental Sciences and Technology Recommended Practice ISO International Organization for Standardization LED Light Emitting Diode NAF

40、PI National Aerospace FOD Prevention, Inc. NASA National Aeronautics and Space Administration RP Recommended Practice UFCWS Unidirectional Flow Clean Work Station 10 IEST 2013 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-CC046.1 4 BACKGROUND AND PURPOSE This RP esta

41、blishes general practices for the preven-tion of visible contaminants in contamination-sensitive high-reliability products processed in non-cleanroom, environmentally controlled areas. The goals in these environments are to: 1. Prevent intrusion of contaminants from out-side the controlled area 2. M

42、inimize the generation of contaminants within the controlled area 3. Remove contaminants before they can attach to critical surfaces The purpose of this RP is to standardize and docu-ment contamination control and foreign object dam-age (FOD) control for production of clean products in non-cleanroom

43、 facilities. This RP provides a standard set of requirements for procedures and contamination control methodologies and adopts a “clean as you go” approach. The recommendations presented mitigate initial and generated contamination during production operations, and preserve product cleanliness throu

44、gh assembly, test, storage, and transportation to the user. 5 CONTAMINATION AND FOD CONTROL PROGRAM Program Development. A key factor in the protec-tion of high-reliability products from the threats of contamination is the development of a Contamination and FOD Control Program. This RP provides a mi

45、n-imum set of requirements for a basic contamination control program. Supplementation and tailoring of this document with other practices, such as existing documentation, may be acceptable with the approval of the product con-tracting organization. As a minimum, the program should establish the faci

46、lity, equipment, and proce-dural contamination control requirements that are necessary to protect products from contamination-related vulnerabilities that may affect performance over the expected lifetime of the products. The fol-lowing documents may be used for reference in de-veloping Contaminatio

47、n and FOD Control Programs: ASTM E1548: Standard Practice for Prepa-ration of Aerospace Contamination Control Plans MIL-HDBK-406: Contamination Control Technology: Cleaning Materials for Preci-sion Precleaning and Use in Clean Rooms and Clean Work Stations MIL-HDBK-407: Contamination Control Technol

48、ogy: Precision Cleaning Methods and Procedures TO 00-25-203: Contamination Control of Aerospace Facilities, U.S. Air Force NAFPI FOD Prevention Guidelines 6 CLASSIFICATION OF CONTROLLED ENVIRONMENTS If no Type is specified, Type I should be used. a) Type I: Controlled Environments without Uni-direct

49、ional Flow Clean Work Stations (UFCWS) Type I Controlled Environments do not utilize UFCWS. b) Type II: Controlled Environments that Utilize UFCWS Type II Controlled Environments utilize one or more UFCWS for a higher level of contamination control for selected operations, hardware types, and configu-rations (see UFCWS operation in section 8). 7 FACILITIES REQUIREMENTS 7.1 Isolation Controlled environments should be isolated from non-controlled environments. Isolation shoul