1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 31 December 2002 prEN 2591 -51 5 Edition P 1 Decem ber 2002 Comments should be sent within six months after the date of publication to Electrical Domain AECMA-STAN PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - S
2、TANDARDIZATION 1 k&?fl Gulledelle 94 - 6-1200 Brussels - Tel. + 32 2 775 81 10 - Fax. + 32 2 775 81 I1 - www.aecma-stan.org ICs: 49.060 ENGLISH VERSION Aerospace series Elements of electrical and optical connection Test methods Part 515: Hydrolytic stability Srie arospatiale Luft- und Raumfahrt Mtho
3、des dessais Prfverfah ren Organes de connexion lectrique et optique Partie 515 : Stabilit hydrolitique Elektrische und optische Verbindungselemente Teil 515: Hydrolytische Stabilitt This %Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA-STAN (The European Association
4、 of Aerospace Industries - Standardization). It is published on green paper for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content sh
5、all not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agreement of AECMA-STAN it will be submitted as a draft European Standard to CEN (European Commiffee for Standa
6、rdization) for formal vote. I I I Copyright 2002 O by AECMA-STA Page 2 prEN 2591-515: 2002 Contents Page Normative references 3 3 . Test method 3 . 4 Page 3 prEN 2591-515: 2002 I Scope This standard specifies a test method for determination of the relative rate of absorption of water by plastic or c
7、om posite material. Its derived from ASTM D 570-98 and it shall be used together with EN 2591-100. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text
8、and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
9、 EN 2591-100 Aerospace series - Elements of electrical and optical connection - Test methods - Part 100: General 1) Aerospace series - Elements of electrical and optical connection - Test methods - Part 1 O1 : Visual examination EN 2591-101 ASTM D 570 - 98 Standard Test Method for Water Absorption o
10、f Plastics 2) 3 Preparation of specimens According to technical specification of product. 4 Details Method: A, B or C. Maximum percentage increased weight and/or soluble material lost. 5 Test method Three different test methods can be used according to the product standard requirement: 5.1 Condition
11、ing The specimen shall be dried in an oven for 24 h at (50 I 3) “C, cooled in a desicator and immediately weighed to the nearest 0,001 g. 1) Published as AECMA Prectandard at the date of publication of this standard 2) Published by: American Society for Testing and Materials (ASTM), 1916 Race St., P
12、hiladelphia PA 19103 Page 4 prEN 2591-515: 2002 5.2 Method A. Long-term immersion to determine the total water absorbed when substantially saturated The conditioned specimens shall be placed in a container of distilled water maintained at temperature of (23 f I) OC, and shall rest on edge and be ent
13、irely immersed. At the end of 24 h they shall be removed from the the water, wiped free of surface moisture with a dry cloth, weighed to the nearest 0,001 g immediately, and then replaced in the water. The weightings shall be repeated at the end of the first week and every two weeks thereafter until
14、 the increase in weight per two-week period, as shown by three consecutive weightings, averages less than 1 % of the total increase in weight or 5 mg, whichever is greater, the specimen shall then be considered substantially saturated. The difference between the substantially saturated weight and th
15、e dry weight shall be considered as the water absorbed when substantially saturated. 5.3 The conditioned specimens shall be placed in a container of boiling distilled water, and shall be supported on edge and be entirely immersed. At the end of (120 f 4) min, the specimens shall be removed from the
16、water, and cooled in distilled water maintained at room temperature. After (15 f 1) min, the specimens shall be removed from the water, one at a time, all surface water removed with a dry cloth, and the specimens weighed to the nearest 0,001 g immediately. Method B: Two hours boiling water immersion
17、 5.4 For all thickness of materials having a relatively high rate of absorption and for thin specimens of other materials which shows a significant weight increase in one half hour, the specimens shall be tested as described in 5.3, except that the time of immersion shall be reduced to (30 f 1) min.
18、 Method C: One half hour boiling water immersion 5.5 Reconditioning The specimens, after immersion, shall be weighed, and then reconditioned for the same time and temperature as used in the original drying period. They shall then cooled in a desicator and immediately reweighed.lf the reconditioned w
19、eight is lower than the conditioned weight, the difference shall be considered as water-soluble matter lost during the immersion test. For such materials, the water-absorption value shall be taken as the sum of the increase in weight on immersion and of the weight of the water-soluble matter. 6 Requ
20、 i remen t The percentage of water absorbed is the sum of the values calculated below and shall be in accordance with the values specified in the product standard. 6.1 Percentage increase weight Percentage increase in weight during immersion , calculated to the nearest 0,Ol % as follows: Wet weight
21、-conditioned weight Conditioned weight x 100 Increase in weight, % = 6.2 Percentage soluble material lost Percentage of soluble material lost during immersion, if determined, calculated to the nearest 0,Ol % as follows: Conditioned weight - reconditioned weight Conditioned weight o. Soluble matter lost, % = 7 Final measurement (if applicable) Visual examination (see EN 2591-101).
