1、BRITISH STANDARD BS EN ISO 1856:2001 Incorporating amendment no. 1 Flexible cellular polymeric materials Determination of compression set The European Standard EN ISO 1856:2000, incorporating amendment A1:2007, has the status of a British Standard ICS 83.100 BS EN ISO 1856:2001 This British Standard
2、 was published under the authority of the Standards Committee and comes into effect on 15 January 2001 BSI 2007 ISBN 978 0 580 60883 4 National foreword This British Standard is the UK implementation of EN ISO 1856:2000, incorporating amendment A1:2007. It is identical with ISO 1856:2000, incorporat
3、ing amendment 1:2007. It supersedes BS EN ISO 1856:1996 which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to ISO text carry the number of the ISO amendment. For example, text altered by ISO amendment 1 is
4、indicated by !“. 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 not purport to include all
5、the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. Date Comments 17499 31 December 2007 See national forewordEUROPEANSTANDARD NORMEEU
6、ROPENNE EUROPISCHENORM ENISO1856 November2000 ICS83.100 SupersedesENISO1856:1996 Englishversion FlexiblecellularpolymericmaterialsDeterminationof compressionset(ISO1856:2000) MatriauxpolymresalvolairessouplesDtermination deladformationrmanenteaprscompression(ISO 1856:2000) WeichelastischepolymereSch
7、aumstoffeBestimmung desDruckverformungsrestes(ISO1856:2000) ThisEuropeanStandardwasapprovedbyCENon1November2000. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandb
8、ibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotif
9、iedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORST
10、ANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2000CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO1856:2000E +A1 September2007Foreword ThetextoftheInternationalStandardISO1856
11、:2000hasbeenpreparedbyTechnicalCommittee ISO/TC45“Rubberandrubberproducts“incollaborationwithTechnicalCommitteeCEN/TC249“Plastics“, thesecretariatofwhichisheldbyIBN . ThisEuropeanStandardsupersedesENISO1856:1996. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanide
12、ntical textorbyendorsement,atthelatestbyMay2001,andconflictingnationalstandardsshallbewithdrawnat thelatestbyMay2001 . AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,
13、 Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal, Spain,Sweden,SwitzerlandandtheUnitedKingdom. Endorsementnotice ThetextoftheInternationalStandardISO1856:2000wasapprovedbyCENasaEuropeanStandardwithout anymodification. NOTE:NormativereferencestoInternational
14、StandardsarelistedinannexZA(normative). ENISO1856:2000 Foreword to amendment A1 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 “Plastics“, the secretariat of which is held b
15、y 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 withdrawn at the latest by March 2008. According to
16、 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, Hungary, Iceland, Ireland, Italy, Latvia, Lith
17、uania, 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 a EN ISO 1856:2000/A1:2007 without any modification. Reference number ISO 1856:200
18、0(E) INTERNATIONAL STANDARD ISO 1856 Third edition 2000-11-01 Flexible cellular polymeric materials Determination of compression set Matriaux polymres alvolaires souples Dtermination de la dformation rmanente aprs compression ENISO1856:2000ii ENISO1856:2000 iii Contents Page 1 Scope 1 2 Normative re
19、ference 1 3 Term and definition .1 4 Principle1 5 Apparatus .2 6 Test pieces .2 6.1 Requirements.2 6.2 Samples showing orientation.2 6.3 Number of test pieces .2 6.4 Conditioning.2 7 7.1 7.2 Method A (compression at 70 C) 3 7.3 Method B (compression at standard conditioning temperature) .3 7.4 Metho
20、d C (compression under specifically specified conditions).3 8 Calculation and expression of results.3 9 10 Test report 4 ENISO1856:2000 Procedure .3 General3 Precision.4iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO me
21、mber bodies). The work of preparing 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, governme
22、ntal and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Dire
23、ctives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the el
24、ements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 1856 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products (other th
25、an hoses). This third edition cancels and replaces the second edition (ISO 1856:1980), which has been technically revised. ENISO1856:2000 1 Flexible cellular polymeric materials Determination of compression set WARNING Persons using this International Standard should be familiar with normal laborato
26、ry practice. This standard 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 practices and to ensure compliance with any national regulatory conditions. 1 Scope This International S
27、tandard specifies three methods for determining the compression set of flexible cellular materials. At present, this International Standard applies 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 fo
28、llowing normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, this publication do not apply. However, parties to agreements based on this International Stand
29、ard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standa
30、rds. 3 Term and definition For the purposes of this International 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 tempera
31、ture and after a given recovery time, the difference being referred to the initial thickness 4P r i n c i p l e 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. ENISO1856:2000 !
32、ISO 1923, “ Cellular plastics and rubbers Determination of linear dimensions. 2 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
33、 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. 5.2 M
34、eans of measuring the dimensions of test pieces 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 con
35、tamination and skin on the vertical sides. When thin materials 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. The test pieces shall be plied together and, where the number of plies is great
36、er than two, interleaved with the photographic mounting slides, and the complete assembly shall be treated during the test as a single thick test piece. 6.2 Samples showing orientation 6.3 Number of test pieces Five 25-mm-thick test pieces, or five assemblies in the case of thin materials, shall be
37、tested. 6.4 Conditioning (23 2) Can d(50 5) % relative humidity; (27 2) Can d(65 5) % relative humidity. ENISO1856:2000 !Testing shall be carried out in the direction in which the finished product will be stressed under service conditions. “ !Materials shall not be tested less than 72 h after manufa
38、cture 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 h or 48 h, respectively. Prior to the test, the test pieces shall beconditioned for at
39、least 16 h in one of the following atmospheres: “!This conditioning period can form the final part of or, in the 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 a shorter time (down to a minimum of
40、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. “ 3 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 accorda
41、nce with ISO 1923. In the case of thin materials, calculate the thickness of the foam d 0 by 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. Remove the apparatus from
42、 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 temperature. Allow the test Remeasure its thickness d r . In the case of thin materials, take care not to disturb the assembly:
43、calculate the thickness d r by 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 (compression at standard conditioning temperature) 7.4 Method C (compression under specifically specified conditions) U
44、se 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 percentage, is given by the formula: 0r 0 c.s. 100 dd d where d 0 is the original thickne
45、ss of the test piece; d r is the thickness of the test piece after recovery. 8.2 Report the value of the compression set, followed by the test conditions, in parentheses, in the order: level of compression, time, temperature. Fo re xa mp l e :c. s.%(5 0%,2 2h,7 0C). ENISO1856:2000 7 Procedure 7.1 Ge
46、neral 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. 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 u
47、nder 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. “ piece to recover for !(30 5) min “ at the same temperature as that used for conditioning. Use the procedu
48、re 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. 4 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 temperature and h
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