1、BRITISH STANDARDBS ISO14624-3:2005Space systems Safety and compatibility of materials Part 3: Determination of offgassed products from materials and assembled articlesICS 49.025.01; 49.140g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51
2、g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS ISO 14624-3:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 April 2006 BSI 2006ISBN 0 580 48104 2National forewordThis British Standard reproduc
3、es verbatim ISO 14624-3:2005 and implements it as the UK national standard.The UK participation in its preparation was entrusted to Technical Committee ACE/68, Space systems and operations, which has the responsibility to: A list of organizations represented on this committee can be obtained on requ
4、est to its secretary.Cross-referencesThe British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Cata
5、logue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand t
6、he text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cov
7、er, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 11 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsReference numberISO 14624-3:2005(E)INTER
8、NATIONAL STANDARD ISO14624-3First edition2005-01-15Space systems Safety and compatibility of materials Part 3: Determination of offgassed products from materials and assembled articles Systmes spatiaux Scurit et compatibilit des matriaux Partie 3: Dtermination des produits issus du dgazage sous atmo
9、sphre des matriaux et des articles assembls BS ISO 14624-3:2005ii iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Conformance . 1 3 Terms and definitions. 1 4 Principle . 3 5 Health and safety of test operators. 3 6 Test conditions 3 7 Apparatus and materials 4 8 Test samples . 4 9 Pretest p
10、rocedure . 5 10 Procedure. 6 11 Precision 6 12 Test report 6 13 Good laboratory practices (GLP) 7 Annex A (informative) Competency and accreditation of test facilities . 8 Annex B (informative) Target compound list. 9 Annex C (informative) Guidelines for evaluation 10 Bibliography . 11 BS ISO 14624-
11、3:2005iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for
12、which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on al
13、l matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are
14、circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held res
15、ponsible for identifying any or all such patent rights. ISO 14624-3 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations. ISO 14624 consists of the following parts, under the general title Space systems Safety and compatibility
16、of materials: Part 1: Determination of upward flammability of materials Part 2: Determination of flammability of electrical-wire insulation and accessory materials Part 3: Determination of offgassed products from materials and assembled articles Part 4: Determination of upward flammability of materi
17、als in pressurized gaseous oxygen or oxygen-enriched environments Part 5: Determination of reactivity of system/component materials with aerospace propellants Part 6: Determination of reactivity of processing materials with aerospace fluids Part 7: Determination of permeability rate and penetration
18、resistance of materials to aerospace fluids BS ISO 14624-3:2005vIntroduction Throughout this part of ISO 14624, the minimum essential criteria are identified by the use of the imperative or the key word “shall”. Recommended criteria are identified by the use of the key word “should” and, while not m
19、andatory, are considered to be of primary importance in providing serviceable, economical and practical designs. Deviations from the recommended criteria may be made only after careful consideration, extensive testing and thorough service evaluation have shown an alternative method to be satisfactor
20、y. The data obtained from this test are used for a toxicological assessment of the risks to personnel. Additional information can be gathered utilizing this test method, for example, taking samples at equal intervals can provide information on offgassing rates. BS ISO 14624-3:2005blank1Space systems
21、 Safety and compatibility of materials Part 3: Determination of offgassed products from materials and assembled articles 1 Scope This part of ISO 14624 specifies a method for determining the identity and quantity of volatile offgassed products from materials and assembled articles utilized in manned
22、, pressurized spacecraft. This test method is not intended to model or simulate spacecraft atmospheres. 2 Conformance The test shall be performed in an accredited test facility (see Annex A for guidelines). The authority having jurisdiction, or test requester, shall provide properly identified mater
23、ial(s) for testing. Alternatively, accredited test facilities may be authorized by the test requester to procure the appropriate material(s). Materials also shall be accompanied by the appropriate vendor-supplied Material Safety Data Sheets to comply with materials-handling requirements defined by t
24、he appropriate countrys Occupational Safety and/or Health Administration. Materials and configured system characteristics can be significantly compromised by sources of contamination, such as exposure to solvents, cleaning agents, abnormal temperatures, variations in humidity, environmental pollutan
25、ts, particulate, and handling. It is important that exposure of the material to these and other contamination sources be sufficiently controlled to minimize variation in test results. As a minimum, all fluids used for testing shall meet or exceed user specifications. 3 Terms and definitions For the
26、purposes of this document, the following terms and definitions apply. 3.1 assembled article any component or assembly of components that is not a single material 3.2 offgassed product organic or inorganic compound evolved as a gas from a material or assembled article 3.3 offgassing evolution of gase
27、ous products from a liquid or solid material into an atmosphere BS ISO 14624-3:20052 3.4 spacecraft maximum allowable concentration SMAC maximum concentration of an offgassed product that is allowed in the habitable area of the spacecraft for a specified flight duration NOTE SMAC values for manned s
28、pacecraft are determined by the cognizant procuring authority/user toxicologist. A current listing of SMAC values is maintained on the Internet at http:/www.jsc.nasa.gov/toxicology/Guidelines. 3.5 toxic hazard index T dimensionless ratio of the projected concentration of each offgassed product to it
29、s SMAC value and summing the ratios for all offgassed products without separation into toxicological categories, and the calculation of the T value is as follows: Ttotal= C1/ISMAC1+ C2/ISMAC2+ + Cn/ISMACn (1) where C1, C2, , Cnare the concentrations of contaminants 1, 2 and n, respectively; ISMAC1,
30、ISMAC2, , ISMACnare the SMAC values for contaminants 1, 2 and n, respectively NOTE For assembled articles, concentration is calculated by dividing the total quantity of each contaminant offgassed during a test by the habitable volume of the spacecraft. For materials, the concentration is calculated
31、by multiplying the total quantity of each contaminant offgassed per gram of material by the total mass of the material to be used in the spacecraft. EXAMPLE Evaluating the maximum limit mass for a standard shuttle test, the total mass of material to be used is assumed to be 45 kg and the habitable v
32、olume of the spacecraft is 65 m3. 3.6 good laboratory practice GLP practice that involves the testing of standard materials to verify data accuracy and repeatability 3.7 round robin testing testing of identical materials at different test facilities for the comparison of results 3.8 average percent
33、relative standard deviation quotient of the standard deviations for each offgassed constituent of y replicate samples of a standard material and the total number of offgassed constituents NOTE For actual samples, the expected test results and average relative standard deviations for the quantities o
34、f offgassed products are near 50 %. The calculations for standard deviation and average percent relative standard deviation are as follows: The standard deviation, s, is given by:s = ()211niixxn=where x is the mean for an individual offgassed constituent. BS ISO 14624-3:20053Therefore, the calculati
35、on for the average percent relative standard deviation As, is given by: As= sy 100 % where sis the summation of the standard deviations for each offgassed constituent; y is the total number of offgassed constituents, for a standard material. 3.9 test chamber apparatus into which the sample container
36、 is placed during thermal conditioning 3.10 sample container vessel which contains the test sample 3.11 room temperature room temperature is equal to (23 3) C 4 Principle When this method is utilized for a toxicological assessment for a component or a material, the total toxic hazard index (T) value
37、s for all volatile offgassed products shall be less than 0,5. 5 Health and safety of test operators Testing outlined in this part of ISO 14624 may generate toxic substances in either the gas or condensed phase. Care shall be taken to protect test operators from such substances. 6 Test conditions 6.1
38、 The test atmosphere should be at least a volume fraction of (20,9 2) % for oxygen with the balance nitrogen or argon, and the test pressure should be 0,5. The maximum limit mass can be determined by calculating the total T value. BS ISO 14624-3:200511Bibliography 1 ISO/IEC 17025, General requiremen
39、ts for the competence of testing and calibration laboratories 2 ISO/IEC Guide 43-1, Proficiency testing by interlaboratory comparisons Part 1: Development and operation of proficiency testing schemes 3 ISO/IEC 17011, Conformity assessment General requirements for accreditation bodies accrediting con
40、formity assessment bodies BS ISO 14624-3:2005BS ISO 14624-3:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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