BS-EN-ISO-14631-1999.pdf

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 83.140.10 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 14631:1999 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 March 1999 © BSI 05-1999 ISBN 0 580 32308 0 National foreword This British Standard is the English language version of EN ISO 14631:1999. It is identical with ISO 14631:1999. The 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 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 CENELEC 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 entitled “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. Compliance 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, the EN ISO title page, pages 2 to 10, an inside back cover and a back cover. This standard has been updated (see copyright 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.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 14631:1999 © BSI 05-1999i Contents Page National forewordInside front cover Foreword2 Text of EN ISO 146313 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE 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 version Extruded sheets of impact-modified polystyrene (PS-I) Requirements and test methods (ISO 14631:1999) Plaques extrudées en polystyrène modifié résistant au choc (PS-I) Prescriptions et méthodes dessai (ISO 14631:1999) Extrudierte Tafeln aus schlagzäh-modifiziertem Polystyrol (PS-I) Anforderungen und Prüfverfahren (ISO 14631:1999) 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-date 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 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, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14631:1999 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14631:1999 © BSI 05-1999 2 Foreword The text of EN ISO 14631:1999 has been prepared by Technical Committee CEN/TC 249 “Plastics”, the secretariat of which is held by IBN, in collaboration with Technical Committee ISO/TC 61 “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 August 1999. 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Annex A and Annex B are informative. Contents Page Foreword2 1Scope3 2Normative references3 3Material3 4Requirements3 5Test methods6 6Designation9 7Marking9 Annex A (informative) Additional guide values10 Annex B (informative) BibliographyInside back cover Figure 1 Difference of length of diagonals (|d1 d2|)4 Table 1 Tolerances for length “l” and width “b” of sheet4 Table 2 Mechanical and thermal properties5 Table 3 Maximum shrinkage for thermoforming applications5 Table 4 Accuracy of equipment6 Table 5 Thermal treatment of PS-I sheet8 Table A.1 Guide values for further properties of PS-I extrusion materials10 Table A.2 Guide values for further mechanical properties of PS-I extrusion materials10 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14631:1999 © BSI 05-19993 1 Scope This standard specifies the requirements and test methods for solid flat extruded sheets of impact-modified polystyrene (PS-I1) without fillers and reinforcing materials. This standard applies only to thickness 0,25 mm to 20,0 mm 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, 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 revisions of any of these publications apply to this European standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN ISO 179, Plastics Determination of Charpy impact strength (ISO 179:1993). EN ISO 291, Plastics Standard atmospheres for conditioning and testing (ISO 291:1997). EN ISO 306, Plastics Thermoplastic materials Determination of Vicat softening temperature (VST) (ISO 306:1994). EN ISO 527-1, Plastics Determination of tensile properties Part 1: General principles (ISO 527-1:1993 including Corr 1:1994). EN ISO 527-2, Plastics Determination of tensile properties Part 2: Test conditions for moulding and extrusion plastics (ISO 527-2:1993 including Corr 1:1994). EN ISO 2039-1, Plastics Determination of hardness Part 1: Ball indentation method (ISO 2039-1:1993). EN ISO 2818, Plastics Preparation of test specimens by machining (ISO 2818:1994). EN ISO 6603-1, Plastics Determination of multiaxial impact behaviour of rigid plastics Part 1: Falling dart method (ISO 6603-1:1985). 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 Impact-resistant polystyrene (PS-I) moulding and extrusion materials Part 1: 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 ISO 2897-1 without 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). 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 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 examined in accordance with 5.3. 1) Abbreviation PS-I see ISO 1043-1 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 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, % h1, in millimetres shall fall within the range: where hn is the nominal sheet thickness in millimetres. Within any individual sheet, the maximum thickness variation from the average actual value, %h2, in millimetres, shall fall within the range: Testing shall be in accordance with 5.4.1. 4.2.2 Length and width Nominal length “ln” and nominal width “bn” of sheets shall 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 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 (|d1 d2|, see Figure 1), shall fall within the range: Testing shall be in accordance with 5.4.3. | % h1| # (0,03 mm + 0,04 × hn)(1) | % h2| # (0,03 mm + 0,02 × hn)(2) Dimensions in millimetres Nominal dimension Dn Tolerances lengthwidth Dn # 1 000+3 1 +2 1 Dn 1 000 +3 × 103 × ln 1 +2 × 103 × bn 1 (3) Figure 1 Difference of length of diagonals (|d1 d2|) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14631:1999 © BSI 05-19995 4.2.4 Bow of sheets in rolled form For sheets in rolled form, a maximum bow of 20 mm in 10 m length is permissible. Testing shall be in accordance with 5.4.4. 4.3 Properties The basic mechanical and thermal properties shall be as described 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 shall 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 thicknesses can be calculated by interpolation. 4.3.3 Physiological behaviour Relevant legislation for physiological behaviour shall be taken into consideration. PropertiesUnitMinimum requirements forTest method subclause PS-NIaPS-RIaPS-HIa Mechanical properties Tensile stress at yield, BYMPa$ 20$ 17$ 135.6.1 Nominal tensile strain at break, ¼tB%$ 20$ 30$ 355.6.2 Modulus of elasticity in tension, EtMPa$ 2 100$ 1 600$ 1 2505.6.3 Charpy impact strength of unnotched specimens, acUb kJ/m2 $ 30$ 35$ 405.6.4 Charpy impact strength of notched specimens, acN kJ/m2 $ 3$ 5$ 75.6.5 50 % impact-failure energy, E50 at hn = 4 mm J$ 10$ 20$ 305.6.6 Ball indentation hardness H 358/30MPa$ 100$ 70$ 605.6.7 Thermal properties Vicat softening temperature VST/B/50 °C75 to 10370 to 10365 to 1035.7.1 a ISO 1043-1 symbols: N: normal; R: raised; H: high b Only valid for nominal sheet thickness hn $ $ 4 mm (see also 5.1.1) Nominal thickness hn 0,25 mm0,5 mm1 mm2 mm4 mm8 mm 8 mm Max. shrinkage in the direction of extrusion 35 %22 %16 %12 %8 %6 % not relevant Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14631:1999 6 © BSI 05-1999 5 Test methods 5.1 Test specimens 5.1.1 Preparation of test specimens Representative test specimens shall be cut longitudinally and transversely evenly distributed over the length and width of the sheet. From a sheet in roll form, a 2 m 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 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. 220 or finer), the direction of abrasion being along the length of the 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 over 4,2 mm 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 4,0 ± 0,2 mm in accordance with EN ISO 2818. 5.1.2 Conditioning Any production quality control test specimens shall be conditioned for at least 16 h at standard atmosphere (23/50) in accordance with EN ISO 291. Shorter conditioning times may be used by agreement with the interested parties when it can be shown that there is no significant difference in the results obtained. 5.1.3 Testing Testing shall be carried out at