ASTM_E_2217_-_12.pdf

Designation:E221712Standard Practice forDesign and Construction of Aerospace Cleanrooms andContamination Controlled Areas1This standard is issued under the fixed designation E2217;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 The purpose of this practice is to provide design andconstruction guidelines for contamination controlled facilitiesused 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 ofaerospace hardware and processes.The objective is to limitcontamination due to the deposition of particulate and molecu-lar contaminants on flight hardware surfaces.1.2 One cleanliness classification of a facility is the airborneparticle concentrations in accordance with ISO 14644-1 and14644-2.Airborne particle concentrations in accordance withFED-STD-209E are included for reference.This simple clas-sification is inadequate to describe a facility that will supportthe assembly and integration of spacecraft.The extendedduration of hardware exposure during fabrication and testing,the sensitivity of the hardware to hydrocarbons and othermolecular contaminants,and the changing requirements duringassembly and integration must be considered in addition to theairborne particle concentrations.1.3 The guidelines specified herein are intended to providefacilities that will effectively restrict contaminants from enter-ing the facility,limit contamination generated by and withinthe facility,and continuously remove airborne contaminantsgenerated during normal operations.Some items of supporthardware,such as lifting equipment,stands,and shoe cleaners,are addressed since these items are often purchased andinstalled with the facility and may require accommodation inthe design of the facility.1.4 Active filtration of molecular contaminants(such ashydrocarbons,silicones,and other chemicals)is discussed.Such active filtration of molecular contaminants may berequired for the processing of highly sensitive optical devices,especially infrared and cryogenic sensors.Control of micro-biological contamination is not included although HEPA(HighEfficiency Particulate Air)filtration will provide some controlof airborne bacteria,spores,and other viable contaminants thatare typically carried on particles of sizes 0.3 m and larger.Control of radioactive contamination and accommodation ofvery hazardous materials such as propellants,strong acids orcaustics,or carcinogens are not addressed.1.5 No facility will compensate for excessive contaminationgenerated inside the facility.In addition to an effective facilitydesign,the user must also institute a routine maintenanceprogram(see Practice E2042)for the facility,and personneland operational disciplines that limit the transfer of contami-nants through entry doors and contaminant generation insidethe facility.1.6 This practice only addresses guidelines for contamina-tion control in facility design.It must be implemented incompliance with all mandatory government and regulatorybuilding and safety codes.References to related cleanroomstandards and U.S.building codes and standards may be foundin IEST-RP-CC012.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7.1 The values given in parentheses are provided forinformation only and are not considered standard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E595 Test Method for Total Mass Loss and Collected Vola-tile Condensable Materials from Outgassing in a VacuumEnvironmentE1216 Practice for Sampling for Particulate Contaminationby Tape Lift1This practice is under the jurisdiction of ASTM Committee E21 on SpaceSimulation and Applications of Space Technology and is the direct responsibility ofSubcommittee E21.05 on Contamination.Current edition approved April 1,2012.Published May 2012.Originallyapproved in 2002.Last previous edition approved in 2007 as E2217-02(2007).DOI:10.1520/E2217-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 E1234 Practice for Handling,Transporting,and InstallingNonvolatile Residue(NVR)Sample Plates Used in Envi-ronment