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1、BRITISH STANDARD BS EN ISO 1856:1996 Polymeric materials, cellular flexible Determination of compression set The European Standard EN ISO 1856:1996 has the status of a British Standard ICS 83.100 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) B
2、SI BS EN ISO 1856:1996 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 November 1996 BSI 10-1998 The following BSI references relate to the work on th
3、is standard: Committee reference PRI/24 Draft announced in BSI Update, August 1996 ISBN 0 580 26076 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/24, Testing of rigid and flexible cellular materials, upon which th
4、e following bodies were represented: British Plastics Federation British Rigid Urethane Foam Manufacturers Association British Rubber Manufacturers Association Limited Department of the Environment (Building Research Establishment) European Phenolic Foam Association Furniture Industry Research Assoc
5、iation Furniture, Timber and Allied Trades Union Ministry of Defence National Bed Federation Limited RAPRA Technology Limited Society of British Aerospace Companies Limited Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.DateComments Licensed Copy: shef
6、fieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1856:1996 BSI 10-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope and field of application3 2Reference3 3Definition3 4Principle 3 5Apparatus3 6Test piece
7、s3 7Procedure3 8Calculation and expression of results4 9Test report4 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1856:1996 ii BSI 10-1998 National foreword This British Standard has been prep
8、ared by Technical Committee PRI/24 and is the English language version of EN ISO 1856:1996 Polymeric materials, cellular flexible Determination of compression set, published by the European Committee for Standardization (CEN). It is identical with ISO 1856:1980. It supersedes BS 4443-1, Methods 6A a
9、nd 6B, which will be withdrawn by amendment. NOTEInternational and European Standards as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. A British Standard does not purport to include all the necessary provisions of a contract. Users of B
10、ritish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard ISO 1923:1981BS EN ISO 1923:1995 Cellular plastics and rubbers. Determi
11、nation of linear dimensions Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will b
12、e indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1856 June 1996 ICS 83.100 Descriptors: Cellular materials, cellular plasti
13、cs, foam rubber, compression tests, compression set English version Polymeric materials, cellular flexible Determination of compression set (ISO 1856:1980) Matriaux polymres alvolaires souples Dtermination de la rmanence la compression (ISO 1856:1980) Polymerwerkstoffe, Weich-elastische Schaumstoffe
14、 Bestimmung des Druckverformungsrestes (ISO 1856:1980) This European Standard was approved by CEN on 1996-01-25. 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 al
15、teration. Up-to-date lists and bibliographical references concerning 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 tra
16、nslation under the responsibility of a CEN member into its own language 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, Luxembo
17、urg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 All rights of reproduction and communication in an
18、y form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 1856:1996 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1856:1996 2 BSI 10-1998 Foreword This text of the international standard from Technic
19、al Committee ISO/TC 45, Rubber and rubber products, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 249, Plastics, the secretariat of which is held by IBN. This European Standard shall be given the status of a natio
20、nal standard, either by publication of an identical text or by endorsement, at the latest by December 1996, and conflicting national standards shall be withdrawn at the latest by December 1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following c
21、ountries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12
22、GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1856:1996 BSI 10-19983 1 Scope and field of application This International Standard specifies three methods for determining the compression set of flexible cellular materials. At present, this International Standard applies only to latex, and polyure
23、thane foams of thickness greater than 2 mm. Methods for other materials will be added as required. 2 Reference ISO 1923, Rigid cellular plastics Determination of linear dimensions.1) 3 Definition compression set the difference between the initial thickness and the final thickness of a test piece of
24、the cellular material after compression for a given time at a given temperature and after a given recovery time, this difference being referred to the initial thickness 4 Principle Maintaining a test piece for a specified time at a specified temperature under constant deflection and noting the effec
25、t on the thickness of the released test piece. 5 Apparatus 5.1 Compression device, consisting of two flat plates having dimensions larger than those of the test pieces, with spacers and clamps such that the plates are held parallel to each other and the space between the plates is adjustable to the
26、required deflected height. For testing thin materials, a requisite number of square photographic glass mounting slides shall be provided. The thickness of the slides shall be between 1 and 1,5 mm and the length of side shall be between 50 and 55 mm. 5.2 Means of measuring the dimensions of test piec
27、es in accordance with ISO 1923. 6 Test pieces 6.1 Requirements Test pieces shall have parallel top and bottom surfaces and essentially vertical sides. They shall be 50 1 mm long, 50 1 mm wide and 25 1 mm thick. All test pieces shall be free from contamination and skin on the vertical sides. When thi
28、n materials are to be tested, sufficient test pieces, of dimensions 50 mm 50 mm, shall be taken so that the sum of their thicknesses before compression is at least 25 mm. The test pieces shall be plied together and interleaved with the photographic mounting slides where the number of plies is greate
29、r than two, and the complete assembly shall be treated during the test as a single thick test piece. 6.2 Samples showing orientation If samples show orientation of the cellular structure, the direction in which the compression is to be carried out shall be agreed between the interested parties. Norm
30、ally, testing should be carried out in that direction in which the finished product will be stressed under service conditions. 6.3 Number of test pieces Five 25 mm thick test pieces, or five assemblies in the case of thin materials, shall be tested. 6.4 Conditioning Materials shall not be tested for
31、 at least 72 h after manufacture. Prior to the test, the test pieces shall be conditioned for at least 16 h in one of the following atmospheres: 20 2 C, 65 5 % relative humidity; or 23 2 C, 50 5 % relative humidity; or 27 2 C, 65 5 % relative humidity. 7 Procedure The test may be carried out by eith
32、er method A, method B or method C or all three. The three methods may, however, not give the same results. 7.1 Method A (compression at 70 C) After the test piece has been conditioned as specified in 6.4, measure its initial thickness in accordance with ISO 1923. In the case of thin materials, calcu
33、late the thickness of the foam (do) by deducting the aggregate thickness of the glass slides from the measured total thickness of the assembly of glass slides and test pieces measured with the assembly in the horizontal position. Place the test piece or assembly between the plates of the compression
34、 device; compress it by either 50 % or 75 % of its thickness and maintain it under this condition. In special cases, a compression of 90 % may be agreed upon. Within 15 min, place the compressed test piece or assembly in an oven at 70 1 C and leave it for 22 h. 1) At present at the stage of draft. (
35、Revision of ISO/R 1923-1972 and ISO/R 1794-1971.) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1856:1996 4 BSI 10-1998 Remove the apparatus from the oven and within 1 min remove the test piece from the apparatus and place it on a s
36、urface of low thermal conductivity, such as wood. The surface shall be at laboratory temperature. The test piece shall be allowed to recover for 30 min at the same temperature as that used for conditioning. Remeasure its thickness (dr). In the case of thin materials, care shall be taken not to distu
37、rb the assembly. Calculate the thickness (dr) by deducting the aggregate thickness of the glass slides from the measured total thickness of the assembly of glass slides and test pieces. 7.2 Method B (compression at standard conditioning temperature) Use the procedure specified for method A, but main
38、tain the test piece under compression for 72 h at the same temperature as that used for conditioning the test piece. 7.3 Method C (compression under specially specified conditions) Use the procedure specified for method A using the specially specified time, temperature and level of compression. 8 Ca
39、lculation and expression of results 8.1 The compression set, expressed as a percentage, is given by the formula: where 8.2 Report the value of the compression set, followed by the test conditions, in parentheses, in the order: level of compression, time, temperature. For example: value % (50 %, 22 h
40、, 70 C). 9 Test report The test report shall include the following information: a) a description of the material; b) the temperature and humidity at which the test piece was conditioned; c) the method used; d) the thickness of the test piece, if other than that specified; e) all the values of compre
41、ssion set, calculated and expressed in accordance with clause 8; f) the median value of compression set. dois the original thickness of the test piece; dris the thickness of the test piece after recovery. dodr do - 100 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, U
42、ncontrolled Copy, (c) BSI BS EN ISO 1856:1996 BSI 10-1998 List of references See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | |
43、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing B
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