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1、 Reference number ISO 14624-6:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 14624-6 FIrst edition 2006-04-15 Space systems Safety and compatibility of materials Part 6: Determination of reactivity of processing materials with aerospace fluids Systmes spatiaux Scurit et compatibilit des matriaux Partie
2、 6: Dtermination de la ractivit des matriaux de traitement avec les fluides arospatiaux ISO 14624-6:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which a
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5、 a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
6、microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii I
7、SO 2006 All rights reserved -,-,- ISO 14624-6:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword 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 Inspect
8、ion of sample on receipt 2 5.2 Preparation of sample 2 5.3 Test methods. 4 Annex A (informative) Examples of forms. 10 Bibliography. 12 -,-,- ISO 14624-6:2006(E) iv ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national st
9、andards 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 which a technical committee has been established has the right to be represented on that committee. International o
10、rganizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules giv
11、en 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 circulated to the member bodies for voting. Publication as an International Standard requires approval by at least
12、75 % of the member bodies casting a vote. ISO 14624-6 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 of materials:
13、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 materials in pressur
14、ized 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 and penetration of materials to ae
15、rospace fluids ISO 14624-6:2006(E) ISO 2006 All rights reserved v Introduction The purpose of this part of ISO 14624 is to identify changes resulting from exposure of a material to an aerospace fluid that renders either the material unsuitable for use or produces an exothermic reaction that may resu
16、lt in a fire. -,-,- INTERNATIONAL STANDARD ISO 14624-6:2006(E) ISO 2006 All rights reserved 1 Space systems Safety and compatibility of materials Part 6: Determination of reactivity of processing materials with aerospace fluids 1 Scope This part of ISO 14624 specifies test equipment and techniques u
17、sed 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 exposure. It provides a means to determine the effects of minor amoun
18、ts 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, only the edition cited applies. For undated references, the late
19、st 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 14951-3, Space systems Fluid characteristics Part 3: Nitrogen 3 T
20、erms 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 aerospace and ground support equipment and propellants EXAMPLES Clea
21、ning 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 -,-,- ISO 14624-6:2006(E) 2 ISO 2006 All rights reserved 3.4 exotherm
22、ic 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 in which a substance decomp
23、oses, 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 chemicals. These chemicals
24、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 goggles. 5 Test procedure
25、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 performed and any anomalie
26、s 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 surface area of (250 5) mm2.
27、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, gaseous nitrogen. Particulate
28、s on the surfaces of solid, porous samples shall be removed with filtered, gaseous nitrogen meeting the requirements of ISO 14951-3. ISO 14624-6:2006(E) ISO 2006 All rights reserved 3 5.2.3 Sample inspection The sample shall be inspected to ensure it is at the specified worst-case thickness. Flaws a
29、nd 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.
30、 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 for
31、m 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 al
32、uminium 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 -,-,- ISO 14624-6:2006(E) 4 ISO 2006 All rights reserve
33、d 5.2.4.3 Tapes Tapes shall be applied 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 r
34、equired, in accordance with the manufacturers 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
35、the intended use. Samples shall be cleaned 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
36、shall be as follows. a) Place a test 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 te
37、st fluid or the material being tested. 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, approximatel
38、y 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 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
39、shall be determined by the expected use-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 specif
40、ied exposure time, carefully blot the 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
41、governing disposal of the test fluid. g) Allow the test sample to dry under flowing air or nitrogen for 24 h prior to final evaluation. -,-,- ISO 14624-6:2006(E) ISO 2006 All rights reserved 5 5.3.1.3 Report The report shall consist of the following as a minimum (an example of a suitable form for re
42、porting the results of this test is shown in Table A.2): a) name of the 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
43、, frothing, charring, solubility, swelling or fracture of the sample; d) 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 Pen
44、etration test 5.3.2.1 General This test is used to determine both the possible 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
45、The test procedure shall be as follows. a) Place an appropriately sized 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.
46、 c) Allow the test fluid to remain in contact with the sample for the specified 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 tim
47、e of occurrence. f) For materials used for protective garments, observe 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,
48、 verification can be made by applying a hypergol-compatible blotter that 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. -,-,-