ISO-9988-1-2004.pdf

INTERNATIONAL STANDARD ISO 9988-1 Third edition 2004-09-01 Reference number ISO 9988-1:2004(E) © ISO 2004 Plastics Polyoxymethylene (POM) moulding and extrusion materials Part 1: Designation system and basis for specifications Plastiques Matériaux à base de polyoxyméthylène (POM) pour moulage et extrusion Partie 1: Système de désignation et base de spécification ISO 9988-1:2004(E) ii© ISO 2004 All rights reserved PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. 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ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland -,-,- ISO 9988-1:2004(E) © ISO 2004 All rights reserved iii 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. 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 main 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. Attention 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 9988-1 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials. This third edition cancels and replaces the second edition (ISO 9988-1:1998), of which it constitutes a minor revision in which the main changes are the deletion of the years of publication of the normative references in Clause 2 and the updating of the number of the ASTM standard used in the second example in Clause 4. ISO 9988 consists of the following parts, under the general title Plastics Polyoxymethylene (POM) moulding and extrusion materials: Part 1: Designation system and basis for specifications Part 2: Preparation of test specimens and determination of properties -,-,- . iv INTERNATIONAL STANDARDISO 9988-1:2004(E) © ISO 2004 All rights reserved 1 Plastics Polyoxymethylene (POM) moulding and extrusion materials Part 1: Designation system and basis for specifications 1Scope 1.1This part of ISO 9988 establishes a system of designation for polyoxymethylene (POM) thermoplastic materials, which may be used as the basis for specifications. Polyoxymethylene materials are thermoplastic materials composed principally of long-chain synthetic homopolymers and copolymers of formaldehyde. The repeating unit in the molecular chain is CH2O as an integral part of the main polymer chain resulting from polymerization of formaldehyde. 1.2The types of polyoxymethylene plastic are differentiated from each other by a classification system based on appropriate levels of the following designatory properties: a)melt mass-flow rate or melt volume-flow rate, b)tensile modulus, and on information about basic polymer parameters, intended application, method of processing, important properties, additives, colorants, fillers and reinforcing materials. 1.3This part of ISO 9988 is applicable to all polyoxymethylene homopolymers and to copolymers of polyoxymethylene and blends of polymers containing polyoxymethylene. It applies to materials ready for normal use in the form of powder, granules or pellets and to materials unmodified and modified by colorants, additives, fillers, etc. 1.4It is not intended to imply that materials having the same designation necessarily give the same performance. This part of ISO 9988 does not provide engineering data, performance data or data on processing conditions which may be required to specify materials for particular end-use applications. If such additional properties are required, they shall be determined in accordance with the test methods specified in part 2 of this International Standard. 1.5In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, additional requirements may be given in data block 5 (see 3.1). ISO 9988-1:2004(E) 2© ISO 2004 All rights reserved 2Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1043-1, Plastics Symbols and abbreviated terms Part 1: Basic polymers and their special characteristics ISO 9988-2, Plastics Polyoxymethylene (POM) moulding and extrusion materials Part 2: Preparation of test specimens and determination of properties 3Designation and specification system 3.1General The designation and specification system for thermoplastics is based on the following standardized pattern: The designation consists of an optional description block, reading “Thermoplastics”, and an identity block comprising the International Standard number and an individual-item block. For unambiguous designation, the individual-item block is subdivided into five data blocks comprising the following information: Data block 1: Identification of the plastic by its symbol POM in accordance with ISO 1043-1 and information about the polymerization process or composition of the polymer (see 3.2). Data block 2: Position 1: Intended application or method of processing (see 3.3). Positions 2 to 8: Important properties, additives and supplementary information (see 3.3). Data block 3: Designatory properties (see 3.4). Data block 4: Fillers or reinforcing materials and their nominal content (see 3.5). Data block 5: For the purpose of specifications, a fifth data block may be added containing additional information (see 3.6). The first character of the individual-item block shall be a hyphen. The data blocks shall be separated from each other by commas. If a data block is not used, this shall be indicated by doubling the separation sign, i.e. by two commas (,). 3.2Data block 1 In this data block, after the hyphen, polyoxymethylene plastics are identified by the symbol “POM” in accordance with ISO 1043-1, followed by a hyphen and the code-letter H for homopolymers or K for copolymers. Designation Description block (optional) Identity block International Standard number block Individual-item block Data blockData blockData blockData blockData block 12345 -,-,- ISO 9988-1:2004(E) © ISO 2004 All rights reserved 3 3.3Data block 2 In this data block, information about intended application and/or method of processing is given in position 1 and information about important properties, additives and colour in positions 2 to 8. The code-letters used are specified in Table 1. If information is presented in positions 2 to 8 and no specific information is given in position 1, the letter X shall be inserted in position 1. 3.4Data block 3 3.4.1General In this data block, the melt mass-flow rate or melt volume-flow rate is represented by a one-figure code-number (see 3.4.2) and the tensile modulus by a one-figure code-number (see 3.4.3). The two code-numbers are separated from each other by a hyphen. If a property value falls on or near a range limit, the manufacturer shall state which range will designate the material. If subsequent individual test values lie on, or either side of, the range limit because of manufacturing tolerances, the designation is not affected. NOTENot all combinations of the values of the designatory properties are provided by currently available materials. Table 1 Code-letters used in data block 2 Code-letterPosition 1Code-letterPositions 2 to 8 AProcessing stabilized BBlow moulding CColoured DPowder EExtrusion FExtrusion of films GGeneral useGGranules HCoatingHHeat-ageing stabilized LMonofilament extrusionLLight or weather stabilized MMoulding NNatural (no colour added) PImpact modified RRotational mouldingRMould release agent SSinteringS2Improved wear and/or frictional properties XNo indicationWStabilized against hydrolysis YTextile yarns, spinningYIncreased electrical conductivity ZAntistatic NOTECode-letter S2, for this document “improved” wear and/or frictional properties, means reduced wear and lowered coefficient of friction in applications requiring the acetal plastic to slide against a similar or different material, such as a plastic bearing sliding against a rotating steel shaft. ISO 9988-1:2004(E) 4© ISO 2004 All rights reserved 3.4.2Melt flow rate The melt mass-flow rate (MFR) or melt volume-flow rate (MVR) shall be determined in accordance with ISO 9988-2. The possible values of the MFR or MVR are divided into seven ranges, each represented by a one-figure code-number, as specified in Table 2. 3.4.3Tensile modulus The tensile modulus shall be determined in accordance with ISO 9988-2. The possible values of the tensile modulus are divided into three ranges, each represented by a one-figure code-number, as specified in Table 3. Table 2 Code-numbers used for melt flow rate in data block 3 Code-number MFR rangeMVR range 1 2butbut 3butbut 4butbut 5butbut 6butbut 7 Table 3 Code-numbers used for tensile modulus in data block 3 Code-number Tensile modulus range MPa 1 2but 3 g/10 mincm3/10 min ?4?3,4 4?73,4?6,0 7?116,0?9,4 11?169,4?13,7 16?3513,7?30,0 35?6030,0?51,5 6051,5 ?2 250 2 250?4 000 4 000 -,-,- ISO 9988-1:2004(E) © ISO 2004 All rights reserved 5 3.5Data block 4 In this data block, the type of filler and/or reinforcing material is represented by a single code-letter in position 1 and its physical form by a second code-letter in position 2, the code-letters being as specified in Table 4. Subsequently (without a space), the mass content may be given by a two-figure number in positions 3 and 4. Mixtures of materials and/or forms may be indicated by combining the relevant codes using the sign “” and placing the whole between parentheses. For example, a mixture of glass fibre (GF) and mineral power (MD) would be indicated by (GF25MD10). 3.6Data block 5 Indication of additional requirements in this optional data block is a way of transforming the designation of a material into a specification for a particular application. This may be done for example by reference to a suitable national standard or to a standard-like, generally established specification. Table 4 Code-letters for fillers and reinforcing materials in data block 4 Code-letterMaterialCode-letterForm BBeads, spheres, balls CCarbona DPowder FFibre GGlassGGround HWhiskers KCalcium carbonate MMinerala, metala,b RAramide SSynthetic, organica XNot specifiedXNot specified ZOthersaZOthersa a These materials may be further defined by their chemical symbol, for example, or additional symbols defined in the relevant International Standard or by additional codes to be agreed upon. b Metal fillers shall be identified by placing the chemical symbol for the metal after the mass content. + 25 %10 % + -,-,- ISO 9988-1:2004(E) 6© ISO 2004 All rights reserved 4Examples of designations 4.1Designation only A polyoxymethylene homopolymer (POM-H) intended for injection moulding (M), with a mould release agent (R), natural (not coloured) (N) and having a melt flow rate of (1) and a tensile modulus of (1), would be designated: Designation:ISO 9988-POM-H,MRN,1-1 4.2Designation transformed into a specification A polyoxymethylene copolymer (POM-K) intended for extrusion (E), weather stabilized (L), natural (not coloured) (N), with a melt flow rate of (2) and a tensile modulus of (2), containing no fillers or reinforcing materials and meeting the requirements of specification ASTM D 6778 POM222, would be specified: Specification:ISO 9988-POM-K,ELN,2-2,ASTM D 6778 POM222 2,1 g/10 min 2 010 MPa 5 g/10 min2 350 MPa . 7 -,-,- ISO 9988-1:2004(E) ICS 83.080.20 Price based on 6 pages © ISO 2004 All rights reserved -,-,-