BS ISO 14624-6-2006 Space systems - Safety and compatibility of materials - Determination of reactivity of processing materials with aerospace fluids《航天系统 材料的安全和兼容性 航空航天流体的加工材料的活性测.pdf

1、BRITISH STANDARD BS ISO 14624-6:2006 Space systems Safety and compatibility of materials Part 6: Determination of reactivity of processing materials with aerospace fluids ICS 49.025.01; 49.140 BS ISO 14624-6:2006 This British Standard was published under the authority of the Standards Policy and Str

2、ategy Committee on 31 May 2006 BSI 2006 ISBN 0 580 48331 2 National foreword This British Standard reproduces verbatim ISO 14624-6:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Technical Committee ACE/68, Space systems and operations, to

3、 Subcommittee ACE/68/-/1, Design engineering production, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related in

4、ternational and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in th

5、e BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible

6、for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 12, an inside back cover and a back co

7、ver. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 14624-6:2006(E)INTERNATIONAL STANDARD ISO 14624-6 FIrst edition 2006-04-15 Space systems Safety and compatibility of m

8、aterials Part 6: Determination of reactivity of processing materials with aerospace fluids Systmes spatiaux Scurit et compatibilit des matriaux Partie 6: Dtermination de la ractivit des matriaux de traitement avec les fluides arospatiaux BS ISO 14624-6:2006ii BS ISO 14624-6:2006iii Contents Page For

9、eword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Safety precautions 2 4.1 Laboratory facilities 2 4.2 Protective clothing 2 5 Test procedure 2 5.1 Inspection of sample on receipt 2 5.2 Preparation of sample 2 5.3 Test methods. 4 Annex A (informative) Exampl

10、es of forms . 10 Bibliography . 12 BS ISO 14624-6:2006 iv 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 committe

11、es. Each member body interested in a subject for 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 Inte

12、rnational Electrotechnical Commission (IEC) on all 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 S

13、tandards adopted by the technical committees are 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. ISO 14624-6 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcom

14、mittee SC 14, Space systems and operations. ISO 14624 consists of the following parts, under the general title Space systems Safety and compatibility of materials: Part 1: Determination of upward flammability of materials Part 2: Determination of flammability of electrical-wire insulation and access

15、ory materials Part 3: Determination of offgassed products from materials and assembled articles Part 4: Determination of upward flammability of materials in pressurized gaseous oxygen or oxygen- enriched environments Part 5: Determination of reactivity of system/component materials with aerospace pr

16、opellants Part 6: Determination of reactivity of processing materials with aerospace fluids Part 7: Determination of permeability and penetration of materials to aerospace fluids v Introduction The purpose of this part of ISO 14624 is to identify changes resulting from exposure of a material to an a

17、erospace fluid that renders either the material unsuitable for use or produces an exothermic reaction that may result in a fire. BS ISO 14624-6:2006blank 1 Space systems Safety and compatibility of materials Part 6: Determination of reactivity of processing materials with aerospace fluids 1 Scope Th

18、is part of ISO 14624 specifies test equipment and techniques used to identify interactions resulting from exposure of a material to an aerospace fluid. This part of ISO 14624 can be used to determine the reactivity of processing materials with aerospace fluids either through intent or casual exposur

19、e. It provides a means to determine the effects of minor amounts of fluids, such as a splash or spill, on materials used in ground support processing operations. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, on

20、ly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 4599, Plastics Determination of resistance to environmental stress cracking (ESC) Bent strip method ISO 4954, Steels for cold heading and cold extruding ISO 149

21、51-3, Space systems Fluid characteristics Part 3: Nitrogen 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 aerospace fluid fluid that is commonly used in the fabrication, development and processing of materials and in the production of aerosp

22、ace and ground support equipment and propellants EXAMPLES Cleaning agents, lubricants and solvents. 3.2 aerospace material material used in the fabrication and/or production of ground support and flight components and systems 3.3 degradation adverse physical or chemical change in a substance BS ISO

23、14624-6:20062 3.4 exothermic reaction chemical reaction that generates heat 3.5 ground support equipment equipment used in the processing and preparation of flight hardware 3.6 immersion test test in which the fluid covers the entire sample for the duration of the test 3.7 reaction chemical change i

24、n which a substance decomposes, combines with other substances, or interchanges constituents with other substances 3.8 test conclusions those results that are reported on the reactivity test report form 4 Safety precautions 4.1 Laboratory facilities Many aerospace fluids are considered to be toxic c

25、hemicals. These chemicals shall only be opened and used inside an approved laboratory hood. 4.2 Protective clothing Personal protective clothing shall be worn by personnel when performing these tests. The minimum protections required are fluid-compatible gloves, laboratory apron, and face shield or

26、goggles. 5 Test procedure 5.1 Inspection of sample on receipt When received, the test material shall be accompanied by proper identification. The minimum information required is the manufacturer, trade name, composition, specification, generic name and batch/lot number. A visual inspection shall be

27、performed and any anomalies shall be noted. Table A.1 shows a suitable material identification form. 5.2 Preparation of sample 5.2.1 General The sample shall be tested in the intended use form (such as sheets or foams) and in the as-received thickness. Samples for the immersion test shall have a sur

28、face area of (250 5) mm 2 . 5.2.2 Sample cleaning Samples shall be cleaned and dried to the end-use specifications. Contamination on the surfaces of solid, nonporous samples shall be removed by washing with deionized water and mild detergent, rinsing with deionized water, and drying with filtered, g

29、aseous nitrogen. Particulates on the surfaces of solid, porous samples shall be removed with filtered, gaseous nitrogen meeting the requirements of ISO 14951-3. BS ISO 14624-6:2006 3 5.2.3 Sample inspection The sample shall be inspected to ensure it is at the specified worst-case thickness. Flaws an

30、d any residual contamination shall be noted. If the flaws result from sample preparation at the test facility, new samples shall be prepared. Samples with flaws that inordinately increase the surface area to bulk mass ratios shall not be tested. Samples shall be weighed and individually identified.

31、5.2.4 Test sample configuration 5.2.4.1 Sheets, film, and fabrics Material being tested for chemical reactivity shall be cut in the form of a 100-mm square sample in the use thickness (see Figure 1). To determine changes in the mechanical properties of a material, the sample shall be cut in the form

32、 of a 100 mm by 150 mm rectangle (see Figure 1). For non-isotropic materials, the 100 mm by 150 mm samples shall be cut from both the machine (warp) and transverse (fill) directions. 5.2.4.2 Adhesives and coatings Adhesives and coatings shall be applied in a thickness equivalent to normal use on alu

33、minium foil and cured, if necessary, in accordance with the manufacturers instructions. Dimensions in millimetres a) Reactivity/penetration test specimen b) Mechanical test specimen c) Exothermic test specimen Figure 1 Test specimen dimensions BS ISO 14624-6:20064 5.2.4.3 Tapes Tapes shall be applie

34、d on aluminium foil, a watch glass or Petri dish in the as-received condition and thickness. 5.2.4.4 Greases and gels Greases and gels shall be applied on aluminium foil, watch glass or Petri dish in a thickness equivalent to normal use. They shall be cured, if required, in accordance with the manuf

35、acturers instructions. 5.2.4.5 Liquids Liquids shall be tested by placing 1 ml in the bottom of a 20 ml glass laboratory beaker. 5.2.4.6 Non-standard configurations Complex shapes such as O-rings, cables, pipes, shall be tested in a configuration consistent with the intended use. Samples shall be cl

36、eaned as specified in 5.2.2. 5.3 Test methods 5.3.1 Reactivity test 5.3.1.1 General This test is used to determine a possible material reaction and/or degradation when exposed to propellants or other liquids of interest. 5.3.1.2 Test procedure The test procedure shall be as follows. a) Place a test

37、specimen sample of the test material (see Figure 1) on a watch glass or in a Petri dish and place a thermocouple in contact with the middle of the specimen. The thermocouple shall be jacketed with glass or other inert material to minimize any reaction with the test fluid or the material being tested

38、. Since the evaporation of the test fluid can mask a reaction, a differential thermocouple scheme using one thermocouple in contact with the sample and another thermocouple in contact with the test fluid may be more definitive. b) Add the test fluid, approximately 1 ml of the specified test fluid, t

39、o the centre of the sample, taking care not to expose the edges of the sample to the fluid to prevent wicking. c) Allow the test fluid to remain in contact with the sample for the specified exposure time. (The test exposure time of the fluid on the test material shall be determined by the expected u

40、se-time of the material.) d) Add test fluid as required to maintain a liquid film on the test sample during the specified exposure time. e) Carefully observe the test sample and thermocouple readout throughout the duration of the test. f) At the end of the specified exposure time, carefully blot the

41、 liquid from the sample and rinse the sample with running water for 60 s. Blotting and rinsing shall be performed with knowledge of the blotting material compatibility of the test fluid. Rinsing shall be performed in accordance with the environmental regulations governing disposal of the test fluid.

42、 g) Allow the test sample to dry under flowing air or nitrogen for 24 h prior to final evaluation. BS ISO 14624-6:2006 5 5.3.1.3 Report The report shall consist of the following as a minimum (an example of a suitable form for reporting the results of this test is shown in Table A.2): a) name of the

43、test material, supplier, and manufacturer; b) test temperature, any temperature change, duration, and sample thickness before and after the test; c) any reactivity observed during the exposure, such as burning, smoking, bubbling, frothing, charring, solubility, swelling or fracture of the sample; d)

44、 any changes in the condition of the sample after the exposure, such as colour, flexibility, rigidity, surface condition, transparency, pitting, hardness, tackiness, friability or powder formation; e) test conclusions. 5.3.2 Penetration test 5.3.2.1 General This test is used to determine both the po

45、ssible liquid penetration and chemical reactivity of materials when exposed to aerospace fluids or other chemicals of interest. This test shall not be performed if the material failed the reactivity test. 5.3.2.2 Test procedure The test procedure shall be as follows. a) Place an appropriately sized

46、sample of the test material (see Figure 1) over a beaker. b) Add approximately 1 ml of the specified test fluid to the centre of the sample, taking care not to expose the edges of the sample to the fluid and start the stopwatch. c) Allow the test fluid to remain in contact with the sample for the sp

47、ecified exposure time. d) Add test fluid as required to maintain a liquid film on the test sample during the specified exposure time. e) Carefully observe for the first fallen droplet at the bottom of the beaker and note the time of occurrence. f) For materials used for protective garments, observe

48、for initial wetness underneath the test sample and note the time of occurrence. NOTE Atmospheric condensation could occasionally form underneath a sample during a test, giving a false indication of penetration. In such an event, verification can be made by applying a hypergol-compatible blotter that

49、 is known to discolour when in contact with a hypergolic fluid. g) Carefully blot the liquid from the sample at the end of the specified exposure time. h) Rinse the sample with running water for 60 s. Rinsing shall be performed in accordance with the environmental regulations governing disposal of the test fluid. i) Allow the test sample to dry under flowing air or nitrogen for 24 h prior to final evaluation. BS ISO 14624-