1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7214:2012Cellular plastics Polyethylene Methods oftest (ISO 7214:2012)BS EN ISO 7214:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementatio
2、n of EN ISO 7214:2012.It supersedes BS EN ISO 7214:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/24, Testing of rigid and flexible cellular materials.A list of organizations represented on this committee can beobtained on request to its secre
3、tary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 77076 0ICS 83.100Compliance with a British Standard cannot confe
4、r immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7214 April 2012 ICS 83.100 Supersedes
5、EN ISO 7214:2007English Version Cellular plastics - Polyethylene - Methods of test (ISO 7214:2012) Plastiques alvolaires - Polythylne - Mthodes dessai (ISO 7214:2012) Schaumstoffe aus Polyethylen - Prfverfahren (ISO 7214:2012) This European Standard was approved by CEN on 31 March 2012. CEN members
6、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 and bibliographical references concerning such national standards may be obtained on application t
7、o 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 the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
8、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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands,
9、Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation
10、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7214:2012: EBS EN ISO 7214:2012EN ISO 7214:2012 (E) 3 Foreword This document (EN ISO 7214:2012) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee CEN/TC 249
11、 “Plastics” the secretariat of which is held by NBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2012, and conflicting national standards shall be withdrawn at the latest by October 20
12、12. 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. This document supersedes EN ISO 7214:2007. According to the CEN/CENELEC Internal R
13、egulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,
14、 Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7214:2012 has been approved by CEN as a EN ISO 7214:2012 without any modification. BS EN ISO 7214:2012ISO 7214:2012(E) ISO 2012 Al
15、l rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Test specimens 24 Conditioning . 25 Atmosphere during test . 26 Measurement of dimensions 27 Mandatory tests . 37.1 Apparent density . 37.2 Compressive stress 37.3 Compression set . 37.4 Tensile strength and elongation
16、 37.5 Dimensional stability at elevated temperature 37.6 Water absorption . 47.7 Burning characteristics . 58 Optional tests . 58.1 Dynamic cushioning performance . 58.2 Compressive creep . 58.3 Thermal conductivity 68.4 Water-vapour transmission 68.5 Dynamic stiffness 68.6 Cell count . 68.7 Tear st
17、rength . 68.8 Permanent set after repeated compression . 79 Test report . 8Annex A (normative) Cell count procedure .10BS EN ISO 7214:2012ISO 7214:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The w
18、ork 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, governmental and non-govern
19、mental, 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 Directives, Part 2.The m
20、ain task of technical committees is to prepare International Standards. 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.At
21、tention is drawn to the possibility that 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.ISO 7214 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.
22、This fourth edition cancels and replaces the third edition (ISO 7214:2007). Figure 1, which was dimensionally incorrect in the previous edition, has been replaced by Figure 2 from ISO 34-1:2010.iv ISO 2012 All rights reservedBS EN ISO 7214:2012INTERNATIONAL STANDARD ISO 7214:2012(E)Cellular plastics
23、 Polyethylene Methods of test1 Scope1.1 This International Standard specifies methods for testing flexible and semi-rigid cellular plastics made from polyethylene. Cellular plastics containing copolymers of ethylene or blends of polymers with polyethylene may also be tested by the procedures of this
24、 International Standard provided these materials have characteristics similar to polyethylene as described in ISO 1872-1, or copolymers of ethylene as described in ISO 4613-1.1.2 Mandatory tests suitable for characterization of cellular polyethylene, regardless of end use, are described in Clause 7.
25、 Optional tests for the determination of properties that are relevant to certain uses are described in Clause 8.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated reference
26、s, the latest edition of the referenced document (including any amendments) applies.ISO 845:2006, Cellular plastics and rubbers Determination of apparent densityISO 1663, Rigid cellular plastics Determination of water vapour transmission propertiesISO 1798, Flexible cellular polymeric materials Dete
27、rmination of tensile strength and elongation at breakISO 1856, Flexible cellular polymeric materials Determination of compression setISO 1872-1, Plastics Polyethylene (PE) moulding and extrusion materials Part 1: Designation system and basis for specificationsISO 1923, Cellular plastics and rubbers
28、Determination of linear dimensionsISO 2796, Cellular plastics, rigid Test for dimensional stabilityISO 2896, Rigid cellular plastics Determination of water absorptionISO 3386-1, Polymeric materials, cellular flexible Determination of stress-strain characteristics in compression Part 1: Low-density m
29、aterialsISO 3582, Flexible cellular polymeric materials Laboratory assessment of horizontal burning characteristics of small specimens subjected to a small flameISO 4613-1, Plastics Ethylene/vinyl acetate (E/VAC) moulding and extrusion materials Part 1: Designation and specificationISO 4651, Cellula
30、r rubbers and plastics Determination of dynamic cushioning performanceISO 7850:1986, Cellular plastics, rigid Determination of compressive creepISO 8301, Thermal insulation Determination of steady-state thermal resistance and related properties Heat flow meter apparatusISO 8302, Thermal insulation D
31、etermination of steady-state thermal resistance and related properties Guarded hot plate apparatusISO 8497, Thermal insulation Determination of steady-state thermal transmission properties of thermal insulation for circular pipes ISO 2012 All rights reserved 1BS EN ISO 7214:2012ISO 7214:2012(E)ISO 9
32、772, Cellular plastics Determination of horizontal burning characteristics of small specimens subjected to a small flame3 Test specimensThe specimens shall be cut so that the edges are clean and the sides are planar and normal to the surface. The specimens shall be cut from the sample so that a repr
33、esentative value is determined for each physical property investigated. With anisotropic samples, take specimens in the appropriate direction.Clauses 7 and 8 outline the requirements for the number of specimens, their shape and their dimensions. Unless otherwise required by a specific test method, t
34、he surfaces of the specimens shall be the same as the surface of the material in normal use.4 ConditioningUnless otherwise specified in Clause 7 or 8, specimens shall be conditioned for a minimum of 24 h at(23 2) C and (50 10) % relative humidity,or(23 5) C and 501020+% relative humidity,or(27 5) C
35、and 651020+% relative humidity.NOTE Some materials may require up to 30 days ageing after manufacture for the physical properties to stabilize.5 Atmosphere during testUnless otherwise specified, testing shall be carried out under the following conditions:(23 2) C and (50 10) % relative humidity,or(2
36、3 5) C and 501020+% relative humidity,or(27 5) C and 651020+% relative humidity.6 Measurement of dimensionsAll measurements shall be taken in accordance with ISO 1923 unless the specimens are not planar over the area of measurement (e.g. because they have been cut from curved articles). With non-pla
37、nar specimens, dimensions not exceeding 30 mm shall be measured using a hand-held dial gauge with a circular 20-mm-diameter foot. A maximum of 1 kPa pressure can be applied to the foot of the hand-held dial gauge, provided that the deformation of the specimen is less than the required accuracy of me
38、asurement.2 ISO 2012 All rights reservedBS EN ISO 7214:2012ISO 7214:2012(E)7 Mandatory tests7.1 Apparent densityDetermine the apparent density in accordance with ISO 845.For specimens that are 15 mm thick or less, the requirement for the minimum volume of the specimen specified in subclause 5.1 of I
39、SO 845:2006 shall be amended to 15 cm3.A dial gauge with measuring surface of 10 cm2, as specified in ISO 1923, shall be used for measurement of thicknesses not greater than 15 mm.7.2 Compressive stressDetermine the compressive stress in accordance with ISO 3386-1.Test specimens shall be a minimum o
40、f 10 mm thick. For thinner materials, stack individual specimens to attain the minimum 10 mm thickness.The test shall be conducted in such a way that the rate of compression is (50 10) % of the initial specimen thickness per minute.Determine the compressive stress during the first compression.Determ
41、ine the compressive stress at 10 %, 25 % and 50 % deformation.7.3 Compression setDetermine the compression set in accordance with ISO 1856.Compress the specimen to a deformation of 25 % of its original thickness for 22 h.Measure the thickness after a 30 min and a 24 h recovery period.7.4 Tensile str
42、ength and elongationDetermine the tensile strength and elongation at break in accordance with ISO 1798.The speed of the grip of the test machine shall be (500 50) mm/min.For materials manufactured at less than 10 mm thickness, test the material in the thickness supplied. For materials 10 mm thick or
43、 more, test the material at (10 1) mm thickness.7.5 Dimensional stability at elevated temperature7.5.1 Method ADetermine the dimensional stability at elevated temperature in accordance with ISO 7850:1986, procedure A.The specimen thickness shall be a minimum of 20 mm. For materials manufactured at 2
44、0 mm or greater thickness, test the material as manufactured. For materials manufactured at less than 20 mm thickness, stack specimens to provide the minimum 20 mm thickness required.Determine the temperature at which the thickness changes by more than 5 % by carrying out the creep test (ISO 7850) f
45、or 7 days with an applied stress of 40 kPa, increasing the test temperature at 5 C intervals until the thickness change during the test exceeds 5 %. ISO 2012 All rights reserved 3BS EN ISO 7214:2012ISO 7214:2012(E)7.5.2 Method BDetermine the dimensional stability at elevated temperature in accordanc
46、e with ISO 2796, using (70 5) C and (20 1) h.Specimens shall be (150 5) mm (150 5) mm square and flat, with parallel upper and lower faces. The thickness shall be that of the material as manufactured.It is recommended that both vertical and horizontal dimensional change be measured.7.6 Water absorpt
47、ion7.6.1 Method A For specimens greater than 25 mm thickDetermine the water absorption in accordance with ISO 2896.The specimen thickness shall be that of the material as manufactured.7.6.2 Method B For specimens not more than 25 mm thick7.6.2.1 SpecimensFor materials without skins:Following the req
48、uirements of ISO 1923, cut out three specimens (100 5) mm wide and (100 5) mm long. The thickness shall be that of the material as manufactured.For materials with a skin on one or both surfaces:Following the requirements of ISO 1923, cut out three test samples (120 5) mm long and (120 5) mm wide, of
49、 the thickness of the material as manufactured, and mark on each a 100 mm square defining the test specimens.7.6.2.2 Apparatus7.6.2.2.1 Water tub and alcohol tub, large enough for the test specimens/test samples to be immersed at least 50 mm below the surface of the liquid.7.6.2.2.2 Air-circulation drying oven, capable of maintaining a temperature of (60 2) C.7.6.2.2.3 Balance, capable of measuring the mass of the specimens to within 1 %.7.6.2.3 Proc
