1、 Reference number ISO 6450:2005(E) ISO 2005INTERNATIONAL STANDARD ISO 6450 First edition 2005-09-01 Rubber- or plastics-coated fabrics Determination of resistance to liquids Supports textiles revtus de caoutchouc ou de plastique Dtermination de la rsistance aux liquides ISO 6450:2005(E) PDF disclaim
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6、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 ISO 2005 All rights reservedISO 6450:2005(E) ISO 2005 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Norm
7、ative references . 1 3 Principle. 1 4 Test liquids for methods 1 and 2. 1 5 Test conditions for methods 1 and 2 2 6 Conditioning atmosphere for methods 1 and 2. 2 7 Apparatus for methods 1 and 2. 2 8 Method 1 Immersion and subsequent removal of excess liquid by wiping. 3 9 Method 2 Immersion in a vo
8、latile test liquid and subsequent drying of the test pieces 4 10 Test report . 4 Annex A (informative) Reference liquids . 5 Annex B (informative) Standard temperatures of immersion 9 Bibliography . 10 ISO 6450:2005(E) iv ISO 2005 All rights reservedForeword ISO (the International Organization for S
9、tandardization) 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 which a technical committee has been established has the ri
10、ght 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 all matters of electrotechnical standardization. Internationa
11、l 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 circulated to the member bodies for voting. Publication as
12、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 responsible for identifying any or all such patent rights. ISO
13、 6450 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products (other than hoses). INTERNATIONAL STANDARD ISO 6450:2005(E) ISO 2005 All rights reserved 1Rubber- or plastics-coated fabrics Determination of resistance to liquids 1 Scope This International
14、Standard specifies two methods (methods 1 and 2) of evaluating the resistance of fabrics coated with plastics or with vulcanized rubber to the action of liquids by measurement of selected properties of the materials before and after immersion in selected liquids. The difference between the two metho
15、ds is as follows: In method 1, excess liquid is removed from the test pieces, after immersion, by wiping. In method 2, the test pieces are immersed in a volatile liquid and excess liquid is subsequently removed by drying in an oven. 2 Normative references The following referenced documents are indis
16、pensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2231, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testin
17、g ISO 2286-1, Rubber- or plastics-coated fabrics Determination of roll characteristics Part 1: Methods for determination of length, width and net mass 3 Principle This International Standard provides a procedure for exposing test pieces to the influence of liquids under defined conditions of tempera
18、ture and time. Selected properties are determined in accordance with the relevant test method standards. Test pieces are then immersed in selected liquid(s) and the properties determined again. The percentage change or the values before and after immersion are measures of the resistance of the mater
19、ial to the selected liquid(s). 4 Test liquids for methods 1 and 2 SAFETY PRECAUTIONS Appropriate safety precautions should be taken when preparing and handling test liquids, especially those known to be toxic, corrosive or flammable. Products giving off fumes should be handled only under an efficien
20、tly ventilated hood, corrosive products should not be allowed to come into contact with the skin or ordinary clothing, and flammable products should be kept away from any source of ignition. In addition, attention is drawn to the damage which can be caused by corrosive test liquids to test equipment
21、 (e.g. clamps or jaws). ISO 6450:2005(E) 2 ISO 2005 All rights reservedAs commercial liquids may not have an entirely constant composition, a standard immersion liquid consisting of a well-defined chemical compound or a mixture of such compounds should preferably be used. Suitable liquids are given
22、in Annex A. If a commercial liquid is used, the test report shall mention all the available information about its origin, composition, properties, e.g. viscosity, aniline point, etc., and batch number. NOTE For test purposes, it is usually desirable to use the liquid(s) with which the coated fabric
23、will come into contact during use. When determining the effect of solutions of chemicals, the concentration of the solution should be appropriate to the proposed application. 5 Test conditions for methods 1 and 2 5.1 Temperature Where appropriate, use an immersion temperature T approximating to that
24、 encountered during use. Maintain the immersion temperature at T 2 C. Preferred immersion temperatures are given in Annex B. 5.2 Immersion period The following immersion periods are recommended: 22 h 0,25 h; 46 h 0,25 h; 72 h 2 h; 168 h 2 h; multiples of 7 days 2 h NOTE When determining changes in p
25、hysical properties, it is advisable to use a period of immersion which is long enough to ensure that equilibrium is reached. To determine this equilibrium point, it is recommended that preliminary measurements be carried out using several different periods of immersion, recording the results as a fu
26、nction of time. Whenever practicable, the total period of immersion should extend well beyond the point at which the change in a property reaches its maximum value. 5.3 Light Immersion tests shall be conducted in the absence of direct light. 5.4 Time lapse between manufacturing and testing The minim
27、um time lapse between manufacturing and testing shall be 16 h. 6 Conditioning atmosphere for methods 1 and 2 Before immersion, test pieces shall be conditioned in one of the atmospheres defined in ISO 2231, unless otherwise specified in the standard relevant to the property to be determined. 7 Appar
28、atus for methods 1 and 2 The apparatus to be used is determined by the temperature of immersion, the volatility of the test liquid, the dimensions of the test pieces and the number required for determining the selected property. At temperatures appreciably below the boiling point of the test liquid,
29、 use a stoppered vessel, e.g. a glass bottle or tube, of such dimensions that the test pieces remain completely immersed in the specified volume of test liquid and all surfaces are completely exposed to the liquid without any restriction. At temperatures near the boiling point of the test liquid, fi
30、t the vessel with a reflux condenser, or other suitable means of minimizing evaporation of the test liquid, instead of the stopper. ISO 6450:2005(E) ISO 2005 All rights reserved 38 Method 1 Immersion and subsequent removal of excess liquid by wiping 8.1 Preparation of test pieces Select properties t
31、hat are considered relevant to the end-use (for example, tensile strength, coating adhesion, mass per unit area, tear resistance and/or low-temperature properties). For each property, cut from the usable width of the roll (as defined in ISO 2286-1) two sets of test pieces as specified in the relevan
32、t test method standard (some commonly used test method standards are given in the Bibliography). Condition all the test pieces in accordance with Clause 6. 8.2 Determination of original properties before immersion Determine the selected properties on the first set of test pieces using the relevant t
33、est method standards. 8.3 Immersion Place the test pieces, suitably separated, in a vessel as described in Clause 7, with a volume of test liquid (see Clause 4) that is at least 15 times the combined volume of the test pieces and sufficient to keep them totally immersed. If the conditions of the tes
34、t do not necessitate the use of a reflux condenser, stopper the vessel. Maintain the test liquid at the test temperature T, within a tolerance of 2 C, during the whole of the exposure period. 8.4 Preparation of test pieces for redetermination of properties At the end of the immersion period, bring t
35、he test pieces, if necessary, to the test temperature, preferably by quickly transferring them to a fresh portion of test liquid at this temperature and allowing to stand for 5 min to 10 min. Take the test pieces out of the test liquid and remove any liquid remaining on the surface of the test piece
36、s using a suitable method. The method of removing the liquid may vary with the nature of the liquid. When mobile, volatile liquids like iso-octane and toluene are used, wipe the test pieces with a filter paper or a piece of lint-free fabric. Some difficulty may be experienced in removing viscous, no
37、n-volatile liquids completely by this method, and it may be necessary to dip the test pieces quickly in a suitable volatile liquid such as methanol and wipe them again with filter paper or lint-free fabric. Visually assess the appearance of the test pieces against a piece of non-immersed material. N
38、ote whether any change has occurred or not and describe any changes observed. 8.5 Determination of properties after immersion Immediately after removal of the liquid, measure the selected physical properties in accordance with the relevant standards. 8.6 Expression of results Report the values measu
39、red before and after immersion or report the change in the values as a percentage of the original value determined before immersion. ISO 6450:2005(E) 4 ISO 2005 All rights reserved9 Method 2 Immersion in a volatile test liquid and subsequent drying of the test pieces 9.1 Preparation of test pieces P
40、repare the test pieces as specified in 8.1. 9.2 Determination of original properties before immersion Determine the original properties as specified in 8.2. 9.3 Immersion Immerse the test pieces as specified in 8.3. 9.4 Drying of test pieces At the end of the specified immersion period, remove the t
41、est pieces and hang them in a circulating-air oven at a temperature of 70 C 2 C for a period of 2 h 0,1 h. At the end of this drying period, remove the test pieces from the oven and allow them to cool to room temperature. 9.5 Determination of properties after immersion and drying The time interval b
42、etween removal of the test pieces from the oven and testing shall not be less than 1 h and not more than 2 h. Measure the selected physical property in accordance with the relevant standard. 9.6 Expression of results Report the values measured before and after immersion or report the change in the v
43、alues as a percentage of the original value determined before immersion. 10 Test report The test report shall include the following information: a) a reference to this International Standard; b) the date of the test; c) the conditioning and test atmosphere; d) all details necessary for identificatio
44、n of the coated fabric tested; e) a description of the test liquid (see Clause 4); f) the method used (method 1 or method 2); g) the immersion temperature; h) the immersion period; i) a description of the appearance of the test pieces after immersion; j) the values of the measured properties before
45、and after immersion, or the percentage changes in the properties; k) any deviation from the specified procedure. ISO 6450:2005(E) ISO 2005 All rights reserved 5Annex A (informative) Reference liquids WARNING Appropriate safety precautions should be taken when preparing and handling test liquids, esp
46、ecially those known to be toxic, corrosive or flammable. Products giving off fumes should be handled only under an efficiently ventilated hood, corrosive products should not be allowed to come into contact with the skin or ordinary clothing, and flammable products should be kept away from any source
47、 of ignition. A.1 Standard simulated fuels Commercial fuels vary widely in composition even within the same grade (i.e. knock rating) and from the same source. There are hydrocarbon-based fuels with and without oxygen compounds as well as alcohol-based fuels. The grade of gasoline is improved by add
48、ing aromatic or oxygen-containing compounds, but these additives increase the effect of fuels on normally fuel-resistant rubbers. The composition varies with the situation on the gasoline market and with the geographical area and can change rapidly. Hence, several test liquids which are used in prac
49、tice are recommended in Tables A.1 and A.2 to cover the range of different compositions. They may also serve as guidelines for the formulation of other suitable test liquids. Analytical reagent quality materials shall be used in making up the test liquids. Test liquids containing alcohol shall not be used if the fuels involved are known to be free of alcohol. Table A.1 Standard simulated fuels without oxygen compounds Liquid Constituents Content % (by volume) A B C D E F 2,2,4-Trimethylpentane 2,2,4
