1、BRITISH STANDARD BS EN ISO 14631:1999 Extruded sheets of impact-modified polystyrene (PS-I) Requirements and test methods The European Standard EN ISO 14631:1999 has the status of a British Standard ICS 83.140.10BSEN ISO14631:1999 This British Standard, having been prepared under the directionof the
2、 Sector Committeefor Materials andChemicals, was publishedunderthe authorityofthe Standards Committee andcomes into effect on 15March1999 BSI 05-1999 ISBN 0 580 32308 0 National foreword This British Standard is the English language version of ENISO14631:1999. It is identical with ISO14631:1999. The
3、 UK participation in its preparation was entrusted to Technical Committee PRI/75, Plastics and rubber film and sheets, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals
4、for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENEL
5、EC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entit
6、led “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complian
7、ce with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages2to10, an inside back cover and a back cover. This standard has been updated (see copyright
8、date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN ISO 14631:1999 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN ISO 14631 3ii
9、blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14631 February 1999 ICS 83.140 Descriptors: Plastics, polystyrene, extruded products, plates, shock resistance, designation, dimensions, dimensional tolerances, mechanical properties, thermal properties, tests, delivery, labelling English
10、 version Extruded sheets of impact-modified polystyrene (PS-I) Requirements and test methods (ISO 14631:1999) Plaques extrudes en polystyrne modifi rsistant au choc (PS-I) Prescriptions et mthodes dessai (ISO14631:1999) Extrudierte Tafeln aus schlagzh-modifiziertem Polystyrol (PS-I) Anforderungen un
11、d Prfverfahren (ISO14631:1999) This European Standard was approved by CEN on 23 November 1998. 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-da
12、te lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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
13、 responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg
14、, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any
15、 means reserved worldwide for CEN national Members. Ref. No. EN ISO14631:1999 EENISO 14631:1999 BSI 05-1999 2 Foreword The text of ENISO14631:1999 has been prepared by Technical Committee CEN/TC249 “Plastics”, the secretariat of which is held by IBN, in collaboration with Technical Committee ISO/TC6
16、1 “Plastics”. 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 August 1999, and conflicting national standards shall be withdrawn at the latest by August1999. According to the CEN/CENELEC Internal
17、Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and t
18、heUnitedKingdom. Annex A and Annex B are informative. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Material 3 4 Requirements 3 5 Test methods 6 6 Designation 9 7 Marking 9 Annex A (informative) Additional guide values 10 Annex B (informative) Bibliography Inside back cover Figure 1
19、Difference of length of diagonals (|d 1d 2 |) 4 Table 1 Tolerances for length “l” and width “b” of sheet 4 Table 2 Mechanical and thermal properties 5 Table 3 Maximum shrinkage for thermoforming applications 5 Table 4 Accuracy of equipment 6 Table 5 Thermal treatment of PS-I sheet 8 Table A.1 Guide
20、values for further properties of PS-I extrusion materials 10 Table A.2 Guide values for further mechanical properties of PS-I extrusion materials 10ENISO 14631:1999 BSI 05-1999 3 1 Scope This standard specifies the requirements and test methods for solid flat extruded sheets of impact-modified polys
21、tyrene (PS-I 1) ) without fillers and reinforcing materials. This standard applies only to thickness0,25mm to20,0mm in accordance with clause 3. This standard also applies to PS-I sheet in roll form. 2 Normative references This European standard incorporates, by dated or undated reference, provision
22、s 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 revisions of any of these publications apply to this European standard only when incorporated in it by ame
23、ndment or revision. For undated references the latest edition of the publication referred to applies. EN ISO 179, Plastics Determination of Charpy impact strength (ISO179:1993). EN ISO 291, Plastics Standard atmospheres for conditioning and testing (ISO291:1997). EN ISO 306, Plastics Thermoplastic m
24、aterials Determination of Vicat softening temperature (VST)(ISO306:1994). EN ISO 527-1, Plastics Determination of tensile properties Part 1: General principles (ISO527-1:1993 including Corr1:1994). EN ISO 527-2, Plastics Determination of tensile properties Part 2: Test conditions for moulding and ex
25、trusion plastics (ISO527-2:1993 including Corr1:1994). EN ISO 2039-1, Plastics Determination of hardness Part1: Ball indentation method (ISO2039-1:1993). EN ISO 2818, Plastics Preparation of test specimens by machining (ISO2818:1994). EN ISO 6603-1, Plastics Determination of multiaxial impact behavi
26、our of rigid plastics Part1:Falling dart method (ISO6603-1:1985). ISO 1043-1, Plastics Symbols and abbreviated terms Part 1: Basic polymers and their special characteristics. ISO 1183, Plastics Methods for determining the density and relative density of non-cellular plastics. ISO 2897-1, Plastics Im
27、pact-resistant polystyrene (PS-I) moulding and extrusion materials Part1:Designation system and basis for specification. ISO 11 501, Plastics Film and sheeting Determination of dimensional change on heating. 3 Material Sheets shall be made of PS-I extrusion compounds designated by ISO2897-1 without
28、filler and reinforcing material. Extrusion compounds can contain additives such as processing aids, stabilizers, flame protective agents and colorants. Compounds and additives of unknown identity shall not be used. NOTELegal conditions can cause a specific choice of extrusion compounds (see 4.3.3).
29、4 Requirements 4.1 Appearance Sheets shall be substantially free from bubbles, voids, cracks, visible impurities and other defects which would make them unfit for the intended use. Surfaces shall be substantially smooth, if not embossed, and free from grooves, sink marks or damages. Colorants shall
30、be homogeneously distributed throughout the material. Slight colour differences based on extrusion compounds and processing are admissible. Admissible variations in any of the above as well as gloss level specifications, if required, shall be agreed between the interested parties. Sheets shall be ex
31、amined in accordance with 5.3. 1) Abbreviation PS-I see ISO1043-1ENISO 14631:1999 4 BSI 05-1999 4.2 Dimensional tolerances 4.2.1 Thickness Within any delivery of sheets, the maximum thickness difference from the nominal, % h 1 , in millimetres shall fall within the range: where h nis the nominal she
32、et thickness in millimetres. Within any individual sheet, the maximum thickness variation from the average actual value,%h 2 , in millimetres, shall fall within the range: Testing shall be in accordance with 5.4.1. 4.2.2 Length and width Nominal length “l n ” and nominal width “b n ” of sheets shall
33、 be agreed between the interested parties. Unless agreed differently, the length is in the direction of extrusion. For any individual sheet selected at random from any delivery, the tolerances of length and width shall be in accordance with Table 1. Testing shall be in accordance with 5.4.2. Table 1
34、 Tolerances for length “l” and width “b” of sheet For rolled sheets the minimum length is the nominal length. 4.2.3 Rectangularity For any individual sheet, selected at random from any delivery, the rectangularity tolerance, expressed as the difference of length of diagonals (|d 1 d 2 |, see Figure
35、1), shall fall within the range: Testing shall be in accordance with 5.4.3. | % h 1 | # (0,03mm + 0,04 h n ) (1) | % h 2 | # (0,03mm + 0,02 h n ) (2) Dimensions in millimetres Nominal dimension D n Tolerances length width D n# 1000 +3 1 +2 1 D n 1000 +3 10 3 l n 1 +2 10 3 b n 1 (3) Figure 1 Differen
36、ce of length of diagonals (|d 1d 2 |)ENISO 14631:1999 BSI 05-1999 5 4.2.4 Bow of sheets in rolled form For sheets in rolled form, a maximum bow of20mm in10m length is permissible. Testing shall be in accordance with 5.4.4. 4.3 Properties The basic mechanical and thermal properties shall be as descri
37、bed below. Guide values of other properties of extruded PS-I sheets are given in Table A.1 and Table A.2 of the informative Annex A. 4.3.1 Mechanical and thermal properties Table 2 Mechanical and thermal properties 4.3.2 Behaviour after heating The maximum shrinkage in the direction of extrusion sha
38、ll not exceed the values given in Table 3 when measured using the method in 5.7.2 and the conditions given in Table 5. The test specimens shall be substantially free from bubbles or cracks after heating. Table 3 Maximum shrinkage for thermoforming applications Intermediate values for other sheet thi
39、cknesses can be calculated by interpolation. 4.3.3 Physiological behaviour Relevant legislation for physiological behaviour shall be taken into consideration. Properties Unit Minimum requirements for Test method subclause PS-NI a PS-RI a PS-HI a Mechanical properties Tensile stress at yield, B Y MPa
40、 $ 20 $ 17 $ 13 5.6.1 Nominal tensile strain at break, tB % $ 20 $ 30 $ 35 5.6.2 Modulus of elasticity in tension, E t MPa $2100 $ 1600 $1250 5.6.3 Charpy impact strength of unnotchedspecimens, a cU b kJ/m 2 $ 30 $ 35 $ 40 5.6.4 Charpy impact strength of notchedspecimens, a cN kJ/m 2 $ 3 $ 5 $ 7 5.6
41、.5 50% impact-failure energy, E 50 at h n= 4mm J $ 10 $ 20 $ 30 5.6.6 Ball indentation hardness H 358/30 MPa $ 100 $ 70 $ 60 5.6.7 Thermal properties Vicat softening temperature VST/B/50 C 75 to 103 70 to 103 65 to 103 5.7.1 a ISO1043-1 symbols: N: normal; R: raised; H: high b Only valid for nominal
42、 sheet thickness h n$ $ 4mm (see also 5.1.1) Nominal thicknessh n 0,25mm 0,5mm 1mm 2mm 4mm 8mm 8mm Max. shrinkage inthe direction ofextrusion 35% 22% 16% 12% 8% 6% not relevantENISO 14631:1999 6 BSI 05-1999 5 Test methods 5.1 Test specimens 5.1.1 Preparation of test specimens Representative test spe
43、cimens shall be cut longitudinally and transversely evenly distributed over the length and width of the sheet. From a sheet in roll form, a2m sample shall be cut from the end of the roll to provide test specimens. Surfaces of the test specimens shall be free from damage and faults in order to avoid
44、notch effects. Should any burrs occur on the test specimens during production these shall be eliminated without damaging the surfaces of the test specimen. If required, the cut edges shall be finished with abrasive paper (grain no. 220or finer), the direction of abrasion being along the length of th
45、e test specimens. If it is necessary to machine the sheet to reduce it to the thickness required, one original surface shall be left intact. In particular, test specimens over4,2mm thick intended to be used in the tests described in 5.6.1 to 5.6.6 shall be machined down on one side to a thickness of
46、4,0 0,2 mm in accordance with EN ISO2818. 5.1.2 Conditioning Any production quality control test specimens shall be conditioned for at least16h at standard atmosphere(23/50) in accordance with EN ISO291. Shorter conditioning times may be used by agreement with the interested parties when it can be s
47、hown that there is no significant difference in the results obtained. 5.1.3 Testing Testing shall be carried out at standard atmosphere (23/50) in accordance with EN ISO291, unless agreed differently between the interested parties or specified in the individual testing standards. 5.2 Delivery condit
48、ion Surfaces and cutting edges should be visually examined for bubbles, voids, cracks, notches and swarf. 5.3 Appearance Where possible, sheets shall be examined for visual defects by transmitted light using a suitable light source. Otherwise, sufficiently bright reflected light should be used. Any
49、defects thus identified shall be compared with the agreed specification (either in written or sample form) and sentenced accordingly. 5.4 Dimensions 5.4.1 Thickness (h) The thickness, h, shall be measured using suitable calibrated equipment according to Table 4: Table 4 Accuracy of equipment 5.4.2 Length (l) and width (b) Length “l” and width “b” shall be measured to the nearest 1mm using suitable calibrated equipment. Measurement shall be directly on the surfac
