1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Flexible cellular polymeric materials - Determination of compression setBS EN ISO 1856:2018National forewordThis British Standard is the UK implementation of EN ISO 1856:2018. It is identical to ISO 1856:2018. It supers
2、edes BS EN ISO 1856:2001, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/24, Testing of rigid and flexible cellular materials.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does n
3、ot purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 92530 6ICS 83.100Compliance with a British Standard cannot confer immunity from legal obli
4、gations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 1856:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 1856August 2018ICS
5、 83.100 Supersedes EN ISO 1856:2000, EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN ISO 1856:2018: EAll rights of exploitation in any form and by any means reserve
6、d worldwide for CEN national MembersFlexible cellular polymeric materials - Determination of compression set (ISO 1856:2018)Matriaux polymres alvolaires souples - Dtermination de la dformation rmanente aprs compression (ISO 1856:2018)Weich-elastische polymere Schaumstoffe - Bestimmung des Druckverfo
7、rmungsrestes (ISO 1856:2018)This European Standard was approved by CEN on 24 July 2018.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
8、 and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 th
9、e responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugosl
10、av Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 1856:2018 (E)European for
11、ewordThis document (EN ISO 1856:2018) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products“ in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.This European Standard shall be given the status of a national standard, eithe
12、r by publication of an identical text or by endorsement, at the latest by February 2019, and conflicting national standards shall be withdrawn at the latest by February 2019.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shal
13、l not be held responsible for identifying any or all such patent rights.This document supersedes EN ISO 1856:2000.According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgar
14、ia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerla
15、nd, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 1856:2018 has been approved by CEN as EN ISO 1856:2018 without any modification.iiBS EN ISO 1856:2018ISO 1856:2018Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Apparatus . 26 Test pieces . 2
16、6.1 Requirements . 26.2 Samples showing orientation . 26.3 Number of test pieces . 26.4 Conditioning 27 Procedure. 37.1 General . 37.2 Method A (compression at 70 C) . 37.3 Method B (compression at standard conditioning temperature) . 37.4 Method C (compression under specifically specified condition
17、s) 38 Calculation and expression of results . 39 Test report . 4 ISO 2018 All rights reserved iiiContents PageBS EN ISO 1856:2018ISO 1856:2018ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepa
18、ring 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 right to be represented on that committee. International organizations, governmental and non-governmental, in l
19、iaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC D
20、irectives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that
21、 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent dec
22、larations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity
23、assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
24、 SC 4, Products other than hoses.This fourth edition cancels and replaces the third edition (ISO 1856:2000), which has been technically revised. It also incorporates the Amendment ISO 1856:2000/Amd.1:2007.The main changes compared to the previous edition are as follows: an additional normative refer
25、ence has been added; in 6.1, an additional requirement for the test pieces has been added; in 6.4, conditioning of the test pieces has been amended; temperature tolerance for method A and B has been added.iv ISO 2018 All rights reservedBS EN ISO 1856:2018Flexible cellular polymeric materials - Deter
26、mination of compression setWARNING Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health.1
27、ScopeThis document specifies three methods for determining the compression set of flexible cellular materials.This document applies to latex and polyurethane foams of thickness greater than 2 mm.2 Normative referencesThe following documents are referred to in the text in such a way that some or all
28、of their content constitutes requirements 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 1923, Cellular plastics and rubbers Determination of linear dimensionsISO 235
29、29, Rubber General procedures for preparing and conditioning test pieces for physical test methods3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: I
30、EC Electropedia: available at https:/www.electropedia.org/ ISO Online browsing platform: available at https:/www.iso.org/obp3.1compression setdifference between the initial thickness and the final thickness of a test piece of the cellular material after compression for a given time at a given temper
31、ature and after a given recovery timeNote 1 to entry: The difference is referred to the initial thickness.4 PrincipleA test piece is maintained for a specified time at a specified temperature under constant deflection and the effect on the thickness of the test piece noted after release.INTERNATIONA
32、L STANDARD ISO 1856:2018 ISO 2018 All rights reserved 1BS EN ISO 1856:2018ISO 1856:20185 Apparatus5.1 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 b
33、etween the plates is adjustable to the required deflected height.For testing thin materials, the requisite number of square photographic glass mounting slides shall be provided. The thickness of the slides shall be between 1 mm and 1,5 mm and the length of the side shall be between 50 mm and 55 mm.5
34、.2 Means of measuring the dimensions of test pieces in accordance with ISO 1923.6 Test pieces6.1 RequirementsTest 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 co
35、ntamination and skin on the vertical sides.When thin materials - whose minimum thickness shall be 2 mm are to be tested, sufficient test pieces, of dimensions (50 50) mm, shall be taken so that the sum of their thicknesses before compression is at least 25 mm. A minimum of two foam plies shall be us
36、ed and each shall be interleaved, if the number of test pieces is greater than two, with the photographic mounting slides. The complete assembly shall be treated during the test as a single thick test piece.6.2 Samples showing orientationTesting shall be carried out in the direction in which the fin
37、ished product will be stressed under service conditions.6.3 Number of test piecesFive 25 mm-thick test pieces, or five assemblies in the case of thin materials, shall be tested.6.4 ConditioningMaterials shall not be tested less than 72 h after manufacture unless, it can be demonstrated that the mean
38、 results obtained at either 16 h or 48 h after manufacture, do not differ by more than 10 % from those obtained at 72 h, in which case testing is permitted 16 h and 48 h, respectively prior to the test. The test pieces shall be conditioned for at least 16 h in one of the following atmospheres accord
39、ing to ISO 23529: (23 2) C and (50 5) % relative humidity; (27 2) C and (65 5) % relative humidity.This conditioning can form the final part of or, in case of testing 16 h after manufacture, the whole of the period following manufacture.In the case of quality-control tests, test pieces can be taken
40、at a shorter time (down to a minimum of 12 h) after manufacture and testing carried out after conditioning for a shorter period (down to a minimum of 6 h) in one of the atmospheres specified above.2 ISO 2018 All rights reservedBS EN ISO 1856:2018ISO 1856:20187 Procedure7.1 GeneralThe test may be car
41、ried out by method A, method B or method C, or by all three. The three methods can, however, give different results.7.2 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 material
42、s, calculate the thickness of the foam d0by deducting the aggregate thickness of the glass slides from the 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 devi
43、ce; compress it by either (50 4) % or (75 4) % 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 0,2) h.Remove the apparatus from the
44、 oven and within 1 min remove the test piece from the apparatus and place it on a surface of low thermal conductivity, such as wood. The surface shall be at the same temperature as that used for conditioning (see 6.4). Allow the test piece to recover for (30 5) min at the same temperature as that us
45、ed for conditioning.Remeasure its thickness dr. In the case of thin materials, take care not to disturb the assembly: calculate the thickness drby deducting the aggregate thickness of the glass slides from the measured total thickness of the assembly of glass slides and test pieces.7.3 Method B (com
46、pression at standard conditioning temperature)Use the procedure specified for method A, but maintain the test piece under compression for (72 0,2) h at the same temperature as that used for conditioning the test piece.7.4 Method C (compression under specifically specified conditions)Use the procedur
47、e specified for method A, using a time, temperature and level of compression agreed between the interested parties.8 Calculation and expression of resultsThe compression set, expressed as a percentage, is given by the formula:c.sr.=ddd00100 whered0is the original thickness of the test piece;dris the
48、 thickness of the test piece after recovery.Report the value of the compression set, followed by the test conditions, in parentheses, in the order: level of compression, time, and temperature.For example: c.s. % (50 %, 22 h, 70 C). ISO 2018 All rights reserved 3BS EN ISO 1856:2018ISO 1856:20189 Test
49、 reportThe test report shall include the following information:a) a reference to this document, i.e. ISO 1856:2018;b) a description of the material;c) the temperature and humidity at which the test piece was conditioned;d) the method used;e) the thickness of the test piece, if other than that specified;f) all the values of the compression set, calculated and expressed in accordance with Clause 8;g) the median value of the compression set, in percent;h) any deviations from this document;i) the date of the t
