1、|BRITISHSTANDARD BSENISO2440:1999ICS 83.100NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWFlexibleandrigidcellularpolymericmaterialsAcceleratedageingtests+A2:2014National forewordThis British Standard is the UK implementation of EN ISO 2440:1999+A2:2014. It is identical to ISO
2、 2440:1997, incorporating amendment 1:2010 and amendment 2:2014. It supersedes BS EN ISO 2440:1999+A1:2010 which is withdrawn.The start and finish of text introduced or altered by amendment isindicated in the text by tags. Tags indicating changes to ISO text carrythe number of the ISO amendment. For
3、 example, text altered by ISO amendment 1 is 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 pu
4、blications does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN ISO 2440:1999+A2:2014This British Standard, havingbeen prepared under thedirecti
5、on of the SectorCommittee for Materials andChemicals, was published underthe authority of the StandardsCommittee and comes into effecton 15 November 2000Amendments/corrigenda issued since publicationDate Comments 30 April 2010 Implementation of ISO amendment 1:2010 with CENendorsement A1:2010; align
6、ment of BSI and CENpublication dates30 November 2014 Implementation of ISO amendment 2:2014 with CEN endorsement A2:2014ISBN 978 0 580 84006 7 The British Standards Institution 2014. Published by BSI Standards Limited 2014:1999+ A1October 2014EN ISO 2440:1999+A2Foreword to amendment A1This document
7、(EN ISO 2440:1999/A1:2010) has been prepared by Technical Committee ISO/TC 45 “Rubberand rubber products“incollaborationwithTechnical Committee CEN/TC249 Plastics the secretariat ofwhich is held by NBN.This Amendment to the European StandardENISO 2440:1999 shall be given the status of a nationalstan
8、dard, either by publicationofanidentical textorbyendorsement, at thelatestbyAugust2010,andconflicting national standards shall be withdrawn at the latest by August 2010.Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. CEN and/or CEN
9、ELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountriesare bound to implement this European Standard: Austria, Belgium, Bulgaria,Croatia, Cyprus, CzechRepublic,
10、 Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement noticeThe text of ISO 2440:1997/Amd 1:2010 ha
11、s been approved by CEN as a EN ISO 2440:1999/A1:2010 withoutany modification.BS EN ISO 2440:1999+A2:2014 EN ISO 2440:1999+A2:2014 (E)This document (EN ISO 2440:1999/A2:2014) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee CEN/TC 249 “Plastics”
12、the secretariat of which is held by NBN. This Amendment to the European Standard EN ISO 2440:1999 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2015, and conflicting national standards shall be withdrawn at the
13、latest by April 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national
14、standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuani
15、a, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 2440:1997/Amd 2:2014 has been approved by CEN as EN ISO 2440:1999/A2:2014 without any modification. Foreword to amen
16、dment A2BS EN ISO 2440:1999+A2:2014 EN ISO 2440:1999+A2:2014 (E)Flexible and rigid cellular polymeric materials Accelerated ageing testsWARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety pr
17、oblems, 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 ScopeThis International Standard specifi es, for fl exible and rigid cellular polymeric materials, lab
18、oratory procedures which are intended to imitate the effects of naturally occurring reactions such as oxidation or hydrolysis by humidity. The physical properties of interest are measured before and after the application of the specifi ed treatments.Test conditions are only given for open cellular l
19、atex, both open- and closed-cell polyurethane foams, and closed-cell polyolefi n foams. Conditions for other materials will be added as required.The effect of the ageing procedures on any of the physical properties of the material may be examined, but those normally tested are either the elongation
20、and tensile properties, or the compression or indentation hard-ness properties.These tests do not necessarily correlate either with service behaviour or with ageing by exposure to light.#If desired, the ageing conditions contained in this International Standard can be applied to composite structures
21、 containing any of the above types of cellular material. This can be helpful in the investigation of possible interactions between cellular materials and other substrates. Composite constructions can be in the form of complete fi nished products or representative small specimens cut there-from.$2 No
22、rmative referenceThe following standard contains provisions which, through 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 Interna
23、tional Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.!ISO 23529, Rubber General procedures for preparing and conditioning test pieces for
24、 physical test methods.“3 Apparatus3.1 For heat ageing!3.1.1 Oven, with forced circulation, capable of maintaining the required temperature to within 3 C.“NOTE It is recommended that a device be used to record the temperature, preferably continuously.3.2 For humidity ageing3.2.1 Ageing apparatus, of
25、 such a size that the total volume of the test pieces does not exceed 10 % of the free air space, and such that the test pieces are free of strain, freely exposed to the ageing atmosphere on all sides and not exposed to light.1BS EN ISO 2440:1999+A2:2014 EN ISO 2440:1999+A2:2014 (E)!3.2.2 Steam auto
26、clave or similar vessel, capable of maintaining the required temperature to within 3 C and of withstanding absolute pressures up to 300 kPa.“!3.2.3 Glass vessel, with a suitable closure, and a water-bath or drying oven for heating the vessel, capable of maintaining the required temperature to within
27、 3 C.“3.3 For physical-property measurementsUse apparatus appropriate to the measurements of the physical property to be examined.4 Test pieces4.1 Number, size and shapeThe number of test pieces, and their size and shape, shall be appropriate to the property being examined. They shall be prepared, b
28、efore ageing, to the dimensions used in the particular test.4.2 ConditioningMaterial shall not be tested less than 72 h after manufacture, unless at either 16 h or 48 h after manufacture it can be demonstrated that the mean result does not differ by more than 10 % from those obtained after 72 h. Tes
29、ting is permitted at either 16 h or 48 h if, at the specifi ed time, the above criterion has been satisfi ed.!Prior to the test, the test pieces shall be conditioned, undefl ected and undistorted, for at least 16 h in one of the following atmospheres as given in ISO 23529.“23 C 2 C, (50 5) % relativ
30、e humidity;27 C 2 C, (65 5) % relative humidity.This period can form the latter part of the period following manufacture.NOTE It is recommended that for reference purposes the test be performed 7 days or more after the cellular material has been manufactured.5 Procedure5.1 GeneralAfter conditioning,
31、 the test of the required physical property shall be performed and the test pieces shall be brought rapidly to the ageing condition. If the test to be performed is destructive, for example the examination of tensile properties, it is recommended that the tests on both reference and aged material be
32、performed at the same time, that is after the exposure of the latter to the ageing conditions.The ageing conditions shall be chosen from the following alternatives which should be appropriate to the material under test. It is recommended that materials differing in chemical composition should not be
33、 aged in the same enclosure. #If a fi nished product is being studied for interaction effects, ensure that the test enclosure contains only that fi nished product test specimen.$5.2 Dry heat ageing5.2.1 TemperaturesPolyolefi n 70 CLatex 70 C or 100 C!Polyurethane 80 C, 125 C or 140 C“2BS EN ISO 2440
34、:1999+A2:2014 EN ISO 2440:1999+A2:2014 (E)NOTE The use of the non-standard temperature of 140 C is included for the following technical reason: the temperature of the ageing test should be as high as possible to enable results to be obtained in the minimum time, but above this critical temperature t
35、he changes which occur when polyurethane foam is tested are not those which are found in service, so that the ageing test will no longer discriminate between foams of different behaviour in service.5.2.2 Duration of ageingUse 16 h, 22 h, 72 h, 96 h, 168 h, 240 h or some multiple of 168 h, with a tol
36、erance 5 %, but not more than 4 h.5.3 Humidity ageing5.3.1 HumidityUse 100 % relative humidity or saturated steam.5.3.2 Temperatures and duration of ageingMaterial ConditionsPolyurethane (all types) 85 C for 20 h or 105 C for 3 hPolyurethane (polyether only) 120 C for 5 h!Tolerance on temperature: 3
37、 C“Tolerance on duration of ageing: 5 % but not more than 2 h, the time being measured from the time when the air in the vessel has been replaced by water vapour or steam.NOTE In this test for resistance to hydrolysis, the use of the non-standard temperatures of 105 C and 120 C is included for the f
38、ollowing technical reasons: 105 C is used because this temperature requires the use of a closed vessel so that control of the conditions is better than at the alternative of 100 C; 120 C is used because much experimental evidence has been accumulated at this temperature, but little or none at the al
39、ternative of 125 C. Until these background data are collected it is not considered possible to change to 125 C.5.4 Reconditioning!After exposure to the ageing conditions, test pieces undergoing humidity ageing shall be dried at 70 C 3 C for 3 h per 25 mm of thickness, subject to a minimum of 3 h. Th
40、e humidity-aged test pieces shall then be reconditioned in the atmosphere specifi ed in 4.2 for 3 h per 25 mm of thickness. Dry-heat-aged test pieces shall merely undergo the reconditioning procedure.“After reconditioning, the properties of the aged test pieces shall be tested.6 Expression of result
41、s6.1 CalculationThe percentage change in the property being examined is given by the formulaa00100XXXwhere 0X is the average value of the property before ageing;aX is the average value of the property after ageing.3BS EN ISO 2440:1999+A2:2014 EN ISO 2440:1999+A2:2014 (E)6.2 FormatThe value of the pe
42、rcentage change shall be stated, followed by the test condition in parentheses, in order time, temperature and method.EXAMPLEValue % (16 h, 70 C, dry heat).7 Test reportThe test report shall contain the following information:a) a reference to this International Standard;b) a description of the mater
43、ial #or composite construction;$c) the procedure and conditions used;d) the average fi nal value of the property #of the cellular material;$e) the percentage change in property, expressed as indicated in clause 6;f) the date of the test;g) any deviations from this International Standard.4BS EN ISO 2
44、440:1999+A2:2014 EN ISO 2440:1999+A2:2014 (E)BSI GroupHeadquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 standardsBSI - British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the
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