BS-ISO-8257-1-1987.pdf

BRITISH STANDARD BS ISO 8257-1:1987 Implementation of ISO 8257-1:1987 Plastics Poly(methyl methacrylate) (PMMA) moulding and extrusion materials Part 1: Designation UDC 678.744.335:678.027.37 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-1:1987 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 August 1995 © BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference PRI/35 Draft for comment 85/43386 DC ISBN 0 580 24644 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PRI/35, Speciality thermoplastics moulding materials, upon which the following bodies were represented: British Plastics Federation British Telecommunications plc Department of Trade and Industry (National Physical Laboratory) ERA Technology Ltd. Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Federation of the Electronics Industry Ministry of Defence Peratec Limited RAPRA Technology Ltd. Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-1:1987 © BSI 11-1999i Contents Page Committees responsibleInside front cover National forewordii Forewordiii Text of ISO 8257-11 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-1:1987 ii © BSI 11-1999 National foreword This British Standard reproduces verbatim ISO 8257-1:1987 and implements it as the UK national standard. This British Standard is published under the direction of the Sector Board for Materials and Chemicals whose Technical Committee PRI/35 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W4 4AL. 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 ISO title page, pages ii to iv, pages 1 to 3 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. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-1:1987 (E) ii © BSI 11-1999 Contents Page Forewordiii 1Scope and field of application1 2References1 3Designation system1 4Coding example3 Table 1 Codes used in Data Block 23 Table 2 Cell codes and cell ranges for Vicat softening temperature, melt flow rate and viscosity number (optional) in data block 33 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-1:1987 (E) © BSI 11-1999iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member 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, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 8257-1 was prepared by Technical Committee ISO/TC 61, Plastics. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-1:1987 (E) © BSI 11-19991 1 Scope and field of application 1.1 This part of ISO 8257 establishes a system of designation for poly(methyl methacrylate) thermoplastic materials which may be used as the basis for specifications. 1.2 The types of PMMA plastics are differentiated from each other by a classification system based on appropriate levels of the designatory properties: a) Vicat softening temperature, b) melt flow rate, c) viscosity number (optional), and information about intended application, method of processing, important properties, additives and colour. 1.3 This designation system is applicable to all poly(methyl methacrylate) (PMMA) homopolymers and copolymers of methyl methacrylate (MMA) containing at least 80 % (m/m) of MMA and not more than 20 % (m/m) of acrylic esters or other monomers. It applies to materials ready for normal use and to materials unmodified and modified by colorants, additives, etc. This part of ISO 8257 does not apply to PMMA modified with elastomers. 1.4 It is not intended to imply that materials having the same designation give necessarily the same performance. This part of ISO 8257 does not provide engineering data, performance data or data on processing conditions which may be required to specify a material for a particular end-use or method of processing. If such additional properties are required, they shall be determined in accordance with the methods specified in ISO 8257-2, if suitable. 1.5 In order to specify a thermoplastic material for a particular application or reproducible processing, additional requirements can be coded in Data Block 5 (see clause 3). 2 References ISO 306, Plastics Determination of the Vicat softening temperature of thermoplastics. ISO 1043-1, Plastics Symbols and codes Part 1: Symbols for basic polymers and their special characteristics1). ISO 1133, Plastics Determination of the melt flow rate of thermoplastics. ISO 1628-6, Plastics Determination of viscosity number and limiting viscosity number Part 6: Poly(methyl methacrylate) (PMMA) moulding and extrusion materials2). ISO 8257-2, Plastics Poly(methyl methacrylate) (PMMA) thermoplastic moulding material Part 2: Preparation of test specimens and determination of properties2). 3 Designation system The designation system of thermoplastics is based on the following standardized pattern. 1) At present at the stage of draft. (Partial revision of ISO 1043:1978.) 2) At present at the stage of draft. Designation Description Block (optional) Identity Block International Standard Number Block Individual Item Block Data Block Data Block Data Block Data Block Data Block 12345 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-1:1987 (E) 2 © BSI 11-1999 It consists of an optional Description Block, reading Thermoplastics, and an Identity Block comprising the International Standard number and an Individual Item Block. For unambiguous coding the Individual Item Block is subdivided into four data blocks comprising the following information: For the purpose of specifications, a fifth data block may be added containing additional information. The kind of information and its codes are not the subject of this part of ISO 8257. The first character of the Individual Item Block shall be a hyphen. The four data blocks shall be separated from each other by a comma. NOTEIf a data block is not used, this shall be indicated by doubling the separation sign, i.e. by two commas (,). 3.1 Data Block 1 In this data block, after a hyphen, a poly(methyl methacrylate) plastic is identified by its symbol PMMA, according to ISO 1043-1. 3.2 Data Block 2 In this data block, information about intended end-use application or method of processing is given in Position 1 and information about important properties, additives and colour in Positions 2 to 4. The codes are specified in Table 1. If information is presented in Positions 2 to 4 and no specific information is given in Position 1, the letter X shall be inserted in Position 1. 3.3 Data Block 3 In this data block, the Vicat softening temperature is coded by three figures, the melt flow rate by three figures and optionally the viscosity number by two figures. The two (or three) codes are separated from each other by hyphens. If a property value falls on or near a cell limit, the manufacturer shall state which cell will designate the material. If subsequent individual test values lie on, or either side of, the cell limit because of manufacturing tolerances, the designation is not affected. NOTENot all combinations of the values of the designatory properties may be provided by currently available materials. The Vicat softening temperature shall be determined according to ISO 306, method B, using a load of 50 N and a heating rate of 50 ± 5 K/h. The melt flow rate shall be determined according to ISO 1133, condition No. 13, at a temperature of 230 °C with a load of 3,8 kgf (MFR 230/3,8). The viscosity number shall be determined according to ISO 1628-6. The designatory properties are each classified by six cells and coded as shown in Table 2. No. 1: Identification of the plastic by its symbol PMMA, according to ISO 1043-1 (see 3.1). No. 2: Position 1: Intended application or method of processing (see 3.2). Positions 2 to 4: Important properties, additives and supplementary information (see 3.2). No. 3: Designatory properties (see 3.3). No. 4: Fillers or reinforcing materials and their nominal content (not included in this part of ISO 8257). Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 8257-1:1987 (E) © BSI 11-19993 Table 1 Codes used in Data Block 2 Table 2 Cell codes and cell ranges for Vicat softening temperature, melt flow rate and viscosity number (optional) in data block 3 4 Coding example A PMMA intended for injection-moulding material (M), light stabilized (L), natural (not coloured) (N), with a Vicat softening temperature of 101 °C (100), a melt flow rate of 10 g/10 min (120) and a viscosity number of 50 ml/g (53) would be designated: CodePosition 1CodePositions 2 to 4 AProcessing stabilized CColouredb DDisc manufactureaDBeads EExtrusion of tubes, profiles and sheetEExpandable FExtrusion of film and thin sheetingFSpecial burning characteristics GGeneral useGPellets, granules HCoatingHHeat-ageing stabilized LMonofilament extrusionLLight and/or weather stabilized MInjection moulding NNatural (not coloured) QCompression moulding RRotational mouldingRMoulding release agent SPowder coating or sinteringSLubricated TControlled transparency XNo indication ZAntistatic a In this part of ISO 8257: video disc manufacture. b C1 = coloured transparent; C2 = coloured non-transparent. Vicat softening temperatureMelt flow rate (MFR 230/3,8)Viscosity number (optional) Code VST range Code MFR range Code VN range °Cg/10 minml/g 076u 80005u 143u 48 084 80 to88015 1 to253 48 to 58 092 88 to96030 2 to463 58 to 68 100 96 to 104060 4 to873 68 to 78 108 104 to 112120 8 to 1683 78 to 88 116 112240 1693 88 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 08:07:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8257-1:1987 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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