1、BRITISH STANDARD Rubber- or plastic- coated fabrics Determination of resistance to liquids The European Standard EN 12759:2001 has the status of a British Standard ICs 59.080.40 BS EN 12759:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 12759:2001 National foreword
2、 This British Standard is the official English language version of EN 12759:2001. The UK participation in its preparation was entrusted to Technical Committee TCI/78, Coated fabrics, which has the responsibility to: - - aid enquirers to understand the text; present to the responsible European commit
3、tee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cross-refe
4、rences The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Cata
5、logue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard, having been
6、 prepared under the direction of the Sector Policy and Strategy Committee for Materials and Chemicals, was published under the authority of the Standards Policy and Strategy Committee on 26 September 2001 Summary of pages This document comprises a front cover, an inside front cover, the EN title pag
7、e, pages 2 to 14, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. IDate I Comments Q BSI 26 September 2001 ISBN O 680 38044 O EUROPEAN STANDARD NORME EUROPENNE EUROPISCH
8、E NORM EN 12759 August 2001 ICs 59.080.40 English version Rubber- or plastic-coated fabrics - Determination of resistance to liquids Supports textiles revtus de caoutchouc ou de plastique - Determination de la resistance aux liquides Mit Kautschuk oder Kunststoff beschichtete Textilien - Bestimmung
9、der Flssigkeitsbestndigkeit This European Standard was approved by CEN on 23 June 2001. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date list
10、s and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsi
11、bility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy. Luxembourg, Netherla
12、nds, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDKATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Management Centre: rue de Stassart, 36 8-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reser
13、ved worldwide for CEN national Members. Ref. No. EN 12759:2001 E EN 12759:ZOOl (E) Foreword This European Standard has been prepared by Technical Committee CENTC 248 “Textiles and textile products“, the secretariat of which is held by BSI. This European Standard shall be given the status of a nation
14、al standard, either by publication of an identical text or by endorsement, at the latest by February 2002, and conflicting national standards shall be withdrawn at the latest by February 2002. . EN 12759 contains two informative annexes : annex A, which gives examples of test liquids, and annex B wh
15、ich suggests a range of possible test temperatures. This standard includes a Bibliography. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finla
16、nd, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 12759:2001 (E) 1 Scope This European Standard describes two methods of evaluating the resistance of fabrics coated with plastics or with vulcanised
17、 rubber to the action of liquids by measurement of selected properties of the materials before and after immersion in selected liquids. The methods described in this European Standard concern the following determinations a) Method 1 : Change of physical properties after immersion in test liquids b)
18、Method 2 : Change of physical properties after exposure and evaporation of volatile test liquids. 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 a
19、nd 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 (
20、including amendments). EN IS0 223 1 Rubber- or plastics-coated fabrics - Standard atmospheres for conditioning and testing (IS0 223 1 : 1989) EN IS0 2286-1 Rubber- or plastics-coated fabrics - Determination of roll characteristics - Part 1: Methods for determination of length, width and net mass (IS
21、0 2286-1: 1998) 3 Principle This European Standard provides a procedure for exposing test specimens to the influence of liquids under defined conditions of temperature and time. Selected properties are determined according to the relevant European or International Standards. Test specimens are then
22、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 material to the selected liquid(s). 4 Test liquids for methods 1 and 2 As commercial liquids may not have an entirely constant comp
23、osition, a standard immersion liquid consisting of well-defined chemical compounds or mixture of compounds shall be used. Some suitable liquids are recommended in annex A (informative). When a commercial liquid is used, the test report shall mention all the available information about its origin, co
24、mposition, properties, e.g. viscosity, aniline point, etc., and batch number. 3 EN 12759:2001 (E) NOTE For test purpose, it is usually desirable to use the liquid(s) with which the coated fabric will come into contact during use. When testing to determine the effect of chemical solutions, the concen
25、tration of the solutions should be appropriate to the proposed application. WARNING 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 efficient
26、ly 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 possible damaging of test equipment (eg clamps or jaws) when using corr
27、osive test liquids. 5 Test conditions for methods 1 and 2 5.1 Temperature Use a test temperature approximating those found during use. Maintain the test temperature (T) at Tf 2 OC. Unless otherwise specified or agreed upon, test temperature (T) should be one of the standard temperatures given in ann
28、ex B. 5.2 Immersion period The following immersion periods are recommended : 22 h k 0,25 h ; 46 h f 0,25 h ; 72 h f 2 h ; 168 h f 2 h ; multiples of 7 days f 2 h. NOTE When testing for changes in physical properties, it is advisable to use such a period of immersion that equilibrium is allowed to be
29、 reached. To define this equilibrium, it is recommended to carry out preliminary measurements with several periods of immersion, recording the results as a function of time. Whenever practicable, the total immersion period should be chosen to extend far beyond the point of maximum variation. 5.3 Lig
30、ht Immersion tests shall be conducted in the absence of direct light. 5.4 Time lapse between manufacturing and testing The minimum time lapse between manufacturing and testing shall be 16 h. 4 EN 12759:ZOOl (E) 6 Conditioning atmosphere for methods 1 and 2 Test specimens shall be conditioned before
31、immersion in one of the atmospheres in accordance with EN IS0 223 1, unless otherwise specified in the standard relevant to the property to be tested. 7 Apparatus for methods 1 and 2 The apparatus to be used is determined by the temperature of immersion, the volatility of the test liquid and the num
32、ber and dimensions of the test specimens required for testing the selected property. At temperatures appreciably below the boiling point of the test liquid, use a stoppered vessel e.g glass bottle, tube, of such dimensions that the test specimens remain completely immersed in the specified volume of
33、 test liquid and are freely exposed on all surfaces without restraint. At temperatures near the boiling point of the test liquid, fit the vessel with a reflux condenser or other suitable means of minimising evaporation of the test liquid, instead of the stopper. 8 Method 1 - Change of physical prope
34、rties after immersion in test liquid. 8.1 Preparation of test specimens Select properties that are considered relevant to the end-use (for example : tensile strength, coating adhesion, mass per unit area, tear resistance, low-temperature properties, etc.). Cut in the usable width of the roll (accord
35、ing to EN IS0 2286-1) two sets of test specimens for each property as specified in the relevant EN or IS0 standard. a Condition all the test specimens according to clause 6. 8.2 Determination of original properties before immersion Determine the selected properties on the first set of test specimens
36、 using the respective EN or IS0 standards (see clause 2). 8.3 Immediate properties after immersion 8.3.1 Immersion Place the test specimens, suitably separated, in a vessel as described in clause 7, with a volume of test liquid (clause 4) that shall be at least 15 times the combined volume of the te
37、st specimens and sufficient to keep them totally immersed. If the conditions of test do not necessitate the use of a reflux condenser, stopper the vessel. Maintain the test liquid at the test temperature (r) during all the exposure period, within a tolerance off 2 OC. 5 EN 12759:ZOOl (E) 8.3.2 Prepa
38、ration before testing At the end of the immersion period, bring the test specimens, if necessary, to the standard testing temperature, preferably by quickly transferring them to a fresh portion of test liquid at this temperature for a period of 5 min to 10 min. Remove the surplus test liquid from th
39、e surface of the test specimens. The method of removing the surplus liquid may vary with the nature of the liquid. When volatile, mobile liquids like iso-octane and toluene are used, remove quickly and wipe the test specimen with filter paper or a piece of textile which does not deposit lint. Some d
40、ifficulty may be experienced in completely removing viscous, non-volatile liquids by this method and it may be necessary to dip the test specimen quickly in a suitable volatile liquid such as methanol and again wipe the test specimen with filter paper or a piece of textile which does not deposit lin
41、t. Visually assess the appearance of the test specimens against a piece of not immersed material. Note whether any change occurred or not and describe the eventual changes observed. 8.3.3 Testing Test immediately after removal of the surplus liquid. Measure the selected physical property in accordan
42、ce with the appropriate standard. 8.4 Expression of results Express the values before and after immersion or the change in properties as a percentage of the value for the original property before immersion. 9 Method 2 - Change of physical properties after immersion and evaporation of volatile test l
43、iquids 9.1 Preparation of test specimens Prepare the test specimens according to 8.1. 9.2 Determination of original properties before immersion Determine the original properties according to 8.2 9.3 Properties after evaporation of volatile test liquid 9.3.1 Immersion Cut and immerse the test specime
44、ns in accordance with 8.3.1. 9.3.2 Evaporation of the volatile liquid At the end of the specified immersion period, remove the test specimens and hang them in a circulating air oven at a temperature of 70 “C k 2 “C for a period of 2 h f O, 1 h. At the end of 6 EN 12759:2001 (E) the drying period, re
45、move the test specimens from the oven and allow them to cool at room temperature. 9.3.3 Testing The time interval between removal from the oven and testing shall be not less than 1 h and not more than 2 h. Measure the selected physical property in accordance with the appropriate standard. 9.4 Expres
46、sion of results Express the values before and after immersion or the change in properties as a percentage of the value for the original property before immersion. 10 Test report The test report shall include the following particulars : a) a reference to this European Standard; b) the date of test; c
47、) the conditioning and testing atmosphere; d) identification of the coated fabric; e) 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) appearance of the test specimens after immersion; j) the value of
48、the measured properties before and after immersion, or their percentage change; k) any deviation from the given procedure. 7 EN 12759:2001 (E) Annex A (informative) Test liquids A.1 Standard simulated fuels The liquids listed in Table A. 1 should be used as standard fuels for the classification of v
49、ulcanised rubber or for quality control in respect of the behaviour of rubbers or plastics in hydrocarbon based liquids, for example petroleum derived fuels. Liquids B, C, and D will afford a reasonable simulation of the effect on rubbers and plastics of the majority of motor gasolines currently available. The latter vary widely in composition, even within the same grade (Le. knock-rating) and within the same location, and the use of all three liquids is necessary to cover this range of composition. Liquid F is intended to simulate diesel fuel, domestic heating oils and similar li
