1、BRITISH STANDARD BS EN 25978:1993 BS 3424-11: 1993 ISO5978:1990 Rubber- or plastics-coated fabrics Determination of blocking resistance The European Standard EN25978:1993 has the status of a British Standard UDC677.077.65:687.066:677.017.424.25:620.1BSEN25978:1993 This British Standard, having been
2、prepared under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15 November1993 BSI07-1999 The following BSI references relate to the work on this standard: Committee reference PRM/78 Special announcem
3、ent in BSINews February1993 ISBN 0 580 21714 0 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitu
4、t Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland I
5、reland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normaliza
6、cin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN25978:1993 BSI 07-1999 i Contents Page Cooperating organizations Inside front co
7、ver National foreword ii Foreword 2 Introduction 3 1 Scope 3 2 Normative reference 3 3 Definition 3 4 Apparatus 3 5 Time interval between manufacture and testing 3 6 Samples and test pieces 3 7 Conditioning of test pieces 3 8 Procedure 3 9 Test report 4 National annex NA (informative) Stacking of si
8、ngle-face test pieces 6 National annex NB (informative) Committees responsible Inside back cover National annex NC (informative) Cross-references Inside back coverBSEN25978:1993 ii BSI 07-1999 National foreword This British Standard has been prepared under the direction of the Plastics and Rubber St
9、andards Policy Committee and is the English language version of EN25978:1993, published by the European Committee for Standardization (CEN). It supersedes BS3424-11:1982 which is withdrawn. In1993 the European Committee for Standardization (CEN) accepted ISO5978:1990 as European Standard EN25978:199
10、3. As a consequence of implementing the European Standard BS3424-11 is renumbered as BSEN25978:1993. This edition makes no technical changes to the standard. The standard was developed by Working Group WG13 of Technical Committee ISO/TC45, Rubber and Rubber Products. Attention is drawn to National a
11、nnex NA concerning stacking of single-face coated fabrics for testing. 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 imm
12、unity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be i
13、ndicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN25978 September1993 UDC677.077.65:687.066:677.017.424.25:620.1 Descriptors: Textiles, coated fabrics, fabrics coated with rubber, fabrics coated with plastics, adhesion tests English version
14、 Rubber- or plastics-coated fabrics Determination of blocking resistance (ISO5978:1990) Supports textiles revtus de caoutchouc ou de plastique Dtermination de la rsistance au blocage (ISO5978:1990) Gummi oder Kunststoffbeschichtete Textilien Bestimmung des Blockwiderstandes (ISO5978:1990) This Europ
15、ean Standard was approved by CEN on1993-04-05. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerni
16、ng such national standards may be obtained on application to the Central Secretariat 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 responsibility of a CEN member into its own lan
17、guage and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
18、UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref.No.EN25978:1993EEN25978:1993 BSI 07-1999 2 Foreword This European Standard is th
19、e endorsement of ISO5978. Endorsement of ISO5978 was recommended by CEN/TC248 “Textiles and textile products” under whose competence this EuropeanStandard will henceforth fall. This European Standard shall be given the status of national standard, either by publication of an identical text or by end
20、orsement, at the latest by March1994, and conflicting national standards shall be withdrawn at the latest by March1994. The Standard was approved and in accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denm
21、ark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, UnitedKingdom.EN25978:1993 BSI 07-1999 3 Introduction Blocking tests at elevated temperatures are designed to estimate the relative resistance of rubber- or plastics
22、-coated fabrics to blocking. For this purpose, the coated fabric is subjected to a specified load over a defined area at a specific temperature. 1 Scope This International Standard specifies a method for the determination of the resistance of rubber- or plastics-coated fabrics to blocking. The metho
23、d specified is acceptable in most cases. If it is desired to use conditions other than those specified, these may be mutually agreed between the contracting parties but such variations shall be stated in the test report. 2 Normative reference The following standard contains provisions which, through
24、 reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying
25、the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO2231:1989, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing. 3 Definition For the purposes of this International Stand
26、ard, the following definition applies. 3.1 blocking an unintentional adherence between materials Definition taken from ISO472:1988, Plastics Vocabulary. 4 Apparatus 4.1 Glass plates, measuring approximately150mm 150mm 3mm. 4.2 Weight-piece, of mass5,0kg. 4.3 Circulating-air oven, of such a size that
27、 the total volume of the test assemblies does not exceed10% of the free space in the oven. Provision shall be made for placing the test assemblies on shelves so they are not less than50mm from each other or from the sides of the oven. The nature of the source of heat is optional but the source shall
28、 be located in the air supply of the oven. Provision shall be made for circulation of air through the oven at a rate such as to provide a minimum of six air changes per hour. The temperature of the oven shall be thermostatically controlled to maintain the temperature of the test assemblies within 2
29、C of the specified temperature. Baffles shall be used as required to prevent over-heating and dead-spots. 5 Time interval between manufacture and testing 5.1 For all purposes, the minimum time between manufacture and testing shall be16h. 5.2 For non-product tests, the maximum time between manufactur
30、e and testing shall be four weeks, and for evaluations intended to be comparable, the tests, as far as possible, shall be carried out after the same time interval. 5.3 For product tests, whenever possible, the time between manufacture and testing shall not exceed three months. In other cases, tests
31、shall be made within two months of the date of receipt by the customer. 6 Samples and test pieces 6.1 Samples shall be taken not less than1m from the end of the roll. 6.2 The test pieces for each sample to be tested shall consist of six specimens, each150mm 150mm. 6.3 Test pieces shall be representa
32、tive of the material being tested. They shall be taken from the working width of the sample. They shall be cut with one edge parallel to the longitudinal axis of the sample. The longitudinal and lateral axes shall be maked on the test pieces. 7 Conditioning of test pieces The test pieces shall be co
33、nditioned in one of the standard atmospheres as defined in ISO2231. 8 Procedure 8.1 Arrange the test pieces in pairs, back to back, face to face and back to face, to form a pile150mm square. Place the test pieces thus arranged between two glass plates(4.1). Place the5,0kg weight-piece(4.2) on the to
34、p plate in a position to ensure an even distribution of pressure. 8.2 Expose the test assembly for3h at a temperature of70 C 2 C in the oven(4.3).EN25978:1993 4 BSI 07-1999 8.3 At the end of the exposure period, remove the test assembly from the oven, immediately take the test piece from between the
35、 plates and allow it to cool for1h. Then carefully separate the test pieces and examine them for adherence or peeling of the coatings. 8.4 Rate the resistance of each test piece to blocking by the scale given below:. 1 No blocking: coated surfaces separate without any evidence of adhering. 2 Slight
36、blocking: some adherence of coated surfaces takes place on separation, but without detriment to the coating. 3 Blocking: coated surfaces are difficult to separate; the coating or part of the coating is removed during separation. 9 Test report The test report shall include the following particulars:
37、a) a reference to this International Standard; b) all details necessary for the identification of the sample; c) the conditioning atmosphere used (seeclause7); d) the total mass on the test piece; e) the rating for resistance to blocking, in accordance with 8.4; f) any departure from the procedure s
38、pecified.5 blankBSEN25978:1993 6 BSI 07-1999 National annex NA (informative) Stacking of single-face test pieces Clause 8.1 requires the test pieces to be arranged in pairs, as follows: Back/back Face/face Back/face and then stacked to form a pile. If single-face coated fabrics are being tested, thi
39、s can result in either one or two coating to coating interfaces, depending upon how the pairs of test pieces are stacked. Therefore, if single-face coated fabrics are being tested it is recommended that the six test pieces selected according to 6.2 be arranged as follows prior to placing them betwee
40、n the two glass plates (see 8.1) so as to provide three coating to coating interfaces. If the coated fabric is double textured it is not normally necessary to conduct a blocking test, but if the textile material is of an open structure or there is any suspicion that the coating polymer interlayer is
41、 not properly fused or cured, a blocking test at ambient temperature, but using the weight-piece specified in 4.2, may be a useful indicator.BSEN25978:1993 BSI 07-1999 National annex NB (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard
42、 was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/78, upon which the following bodies were represented: British Nonwovens Manufacturers Association British Plastics Federation British Railways Board British Resin Manufacturers Association British
43、 Rubber Manufacturers Association Ltd. British Textile Confederation British Textile Technology Group Department of Health Department of the Environment: Building Research Establishment Furniture Industry Research Association Home Office Industrial Safety (Protective Equipment) Manufacturers Associa
44、tion Made-up Textiles Association Ministry of Defence RAPRA Technology Ltd. SATRA Footwear Technology Centre Society of Motor Manufacturers and Traders Ltd. British Coal Corporation Coopted member National annex NC (informative) Cross-references Publication referred to Corresponding British Standard
45、 ISO472:1988 BS1755 Glossary of terms used in the plastics industry Part1:1982 Polymer and plastics technology ISO2231:1989 BS3424 Testing coated fabrics Part2:1992 Method4. Pre-conditioning and conditioning of coated fabrics for testing purposesBS EN 25978:1993 BS 3424-11: 1993 ISO 5978:1990 BSI 38
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