1、January 2008DEUTSCHE NORM English price group 8No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 83.100!$K:I“1402338www.
2、din.deDDIN EN ISO 1856SupersedesDIN EN ISO 1856:2001-03www.beuth.deDocument comprises 10 pagesFlexible cellular polymeric materials Determination of compression set (ISO 1856:2000+Amd. 1:2007) (includes Amendment A1:2007) English version of DIN EN ISO 1856:2008-01 Weich-elastische polymere Schaumsto
3、ffe Bestimmung des Druckverformungsrestes (ISO 1856:2000+Amd. 1:2007) (enthlt nderung A1:2007) Englische Fassung DIN EN ISO 1856:2008-01 DIN EN ISO 1856:2008-01 2 National foreword This standard has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products”, Subcommittee SC 4 “Produ
4、cts (other than hoses)”, in collaboration with Technical Committee CEN/TC 249 “Plastics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-04-37 AA Prfung wei
5、ch-elastischer Schaumstoffe. This document includes Amendment A1, approved by CEN on 2007-09-16. The start and finish of text introduced or altered by amendment is indicated in the text by a vertical line in the left margin. The DIN Standard corresponding to the International Standard referred to in
6、 clause 2 of the EN is as follows: ISO 1923 DIN EN ISO 1923 Amendments This standard differs from DIN EN ISO 1856:2001-03 as follows: a) Normative references are no longer dated. b) The specifications for conditioning the test pieces have been supplemented. c) In clause 7, tolerances for conditionin
7、g temperature and time have been specified. Previous editions DIN 53572-1: 1958-08 DIN 53572: 1965-07, 1979-01, 1986-11 DIN EN ISO 1856: 1996-08, 2001-03 National Annex NA (informative) Bibliography DIN EN ISO 1923, Cellular plastics and rubbers Determination of linear dimensions EUROPEAN STANDARD N
8、ORME EUROPENNE EUROPISCHE NORM EN ISO 1856 November 2000 +A1 September 2007 ICS 83.100 English version Flexible cellular polymeric materials Determination of compression set (ISO 1856:2000+Amd. 1:2007) Matriaux polymres alvolaires souples Dtermination de la dformation rmanente aprs compression (ISO
9、1856:2000+Amd. 1:2007) Weich-elastische polymere Schaumstoffe Bestimmung des Druckverformungsrestes (ISO 1856:2000+Amd. 1:2007) EN ISO 1856:2000 was approved by CEN on 2000-11-01 and Amendment A1 on 2007-09-16. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate
10、 the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. The European Standards exist in
11、 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 language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of
12、Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and the United Kingd
13、om. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 1856:2000+A1:20
14、07 EDIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 2 Contents Page Foreword to EN ISO 1856:20003 Foreword to EN ISO 1856:2000/A1:2007.3 1 Scope 4 2 Normative reference 4 3 Term and definition4 4 Principle4 5 Apparatus .5 6 Test pieces .5 6.1 Requirements.5 6.2 Samples showing orientation.5 6.3
15、 Number of test pieces .5 6.4 Conditioning.5 7 Procedure .6 7.1 General6 7.2 Method A (compression at 70 C) 6 7.3 Method B (compression at standard conditioning temperature) .6 7.4 Method C (compression under specifically specified conditions).6 8 Calculation and expression of results.6 9 Precision.
16、7 10 Test report 7 Annex ZA (normative) Normative references to international publications with their relevant European publications 8 DIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 3 Foreword to EN ISO 1856:2000 The text of the International Standard ISO 1856:2000 has been prepared by Technic
17、al Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the
18、latest by May 2001, and conflicting national standards shall be withdrawn at the latest by May 2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Den
19、mark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 1856:2000 was approved by CEN as a European Standard without any modification.
20、NOTE Normative references to International Standards are listed in annex ZA (normative). Foreword to EN ISO 1856:2000/A1:2007 This document (EN ISO 1856:2000/A1:2007) has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products” in collaboration with Technical Committee CEN/TC 249
21、“Plastics”, the secretariat of which is held by NBN. This Amendment to the European Standard EN ISO 1856:2000 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2008, and conflicting national standards shall be withd
22、rawn at the latest by March 2008. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
23、Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 1856:2007 has been approved by CEN as EN ISO 1856:2000/A1:2007 without any
24、 modification. DIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 4 WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility
25、of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies three methods for determining the compression set of flexible cellular materials. At present, this International Standard a
26、pplies only to latex and polyurethane foams of thickness greater than 2 mm. Methods for other materials will be added as required. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. F
27、or dated references, subsequent amendments to, or revisions of, this publication do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated
28、references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1923, Cellular plastics and rubbers Determination of linear dimensions. 3 Term and definition For the purposes of this International
29、 Standard, the following term and definition apply. 3.1 compression set the difference 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 temperature and after a given recovery time, the difference being referr
30、ed to the initial thickness 4 Principle A 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. DIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 5 5 Apparatus 5.1 Compression devic
31、e, 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 required deflected height. For testing thin materials, the requisite number of s
32、quare 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. 5.2 Means of measuring the dimensions of test pieces in accordance with ISO 1923. 6 Test pieces 6.1 Requirements Test
33、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 thin materials are to be tested, sufficient test pieces, of dimen
34、sions (50 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, where the number of plies is greater than two, interleaved with the photographic mounting slides, and the complete assembly shall be treated during
35、 the test as a single thick test piece. 6.2 Samples showing orientation Testing shall be carried out in the 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, sha
36、ll be tested. 6.4 Conditioning Materials shall not be tested less than 72 h after manufacture unless it can be demonstrated that the mean results obtained at either 16 h or 48 h after manufacture do not differ by more than 10 % from those obtained after 72 h, in which case testing is permitted at 16
37、 h or 48 h, respectively. Prior to the test, the test pieces shall be conditioned for at least 16 h in one of the following atmospheres: (23 2) C and (50 5) % relative humidity; (27 2) C and (65 5) % relative humidity. This conditioning period can form the final part of or, in the case of testing 16
38、 h after manufacture, the whole of the period following manufacture. In the case of quality-control tests, test pieces can be taken 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 at
39、mospheres specified above. DIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 6 7 Procedure 7.1 General The test may be carried out by method A, method B or method C, or by all three. The three methods may, however, give different results. 7.2 Method A (compression at 70 C) After the test piece ha
40、s been conditioned as specified in 6.4, measure its initial thickness in accordance with ISO 1923. In the case of thin materials, 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 me
41、asured with the assembly in the horizontal position. Place the test piece or assembly between the plates of the compression device; 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
42、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 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 laboratory te
43、mperature. Allow the test piece to recover for (30 5) min at the same temperature as that used 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 t
44、he measured total thickness of the assembly of glass slides and test pieces. 7.3 Method B (compression 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 th
45、e test piece. 7.4 Method C (compression under specifically specified conditions) Use the procedure specified for method A, using a time, temperature and level of compression agreed between the interested parties. 8 Calculation and expression of results 8.1 The compression set, expressed as a percent
46、age, is given by the formula: 0r0c.s. 100ddd= where d0is the original thickness of the test piece; dris the thickness of the test piece after recovery. DIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 7 8.2 Report the value of the compression set, followed by the test conditions, in parentheses,
47、 in the order: level of compression, time, temperature. For example: c.s. % (50 %, 22 h, 70 C). 9 Precision No precision data are available. 10 Test report The test report shall include the following information: a) a reference to this International Standard; b) a description of the material; c) the
48、 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 perc
49、ent; h) any deviations from this International Standard; i) the date of the test. DIN EN ISO 1856:2008-01 EN ISO 1856:2000+A1:2007 (E) 8 Annex ZA (normative) Normative references to international publications with their relevant European publications 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 and the publications are listed hereafter. For dated references, subsequent amendments to or r
