Standard

NS-EN ISO 11542-1:2001

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This part of ISO 11542 establishes a system of designation for PE-UHMW thermoplastic materials which may be used as the basis for specifications.For the purposes of this part of ISO 11542, PE-UHMW materials are polyethylene materials having a melt mass-flow rate (MFR), measured at 190 °C and 21,6 kg load, of less than 0,1 g/10 min.The types of PE-UHMW are differentiated from each other by a classification system based on appropriate levels of the designatory propertiesviscosity numberelongational stressCharpy notched impact strengthand on information about intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials.This part of ISO 11542 is applicable to all PE-UHMW homopolymers and to ultra-high-molecular-weight copolymers of ethylene having a content of other 1-olefinic monomers of less than 50 % by mass and a content of non-olefinic monomers with functional groups up to a maximum of 3 % by mass.It applies to materials ready for normal use in the form of powder, granules or pellets and to materials unmodified or modified by colorants, additives, fillers, etc.It is not intended to imply that materials having the same designation give necessarily the same performance. This part of ISO 11542 does not provide engineering data, performance data or data on processing conditions which may be required to specify a material for a particular application and/or method of processing.If such additional properties are required, they shall be determined in accordance with the test methods specified in part 2 of this International Standard, if suitable.In 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).The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 11542. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 11542 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.The designation 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 coding, the individual-item block is subdivided into five data blocks comprising the following information:Data block 1: Identification of the plastic by its symbol PE-UHMW in accordance with ISO 1043-1 (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 (,,).In this data block, after the hyphen, PE-UHMW plastics are identified by the symbol PE-UHMW, in accordance with ISO 1043-1.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.In this data block, the range of the viscosity number is represented by a single-figure code-number (see 3.4.2), the elongational stress by a single-figure code-number (see 3.4.3), and the Charpy notched impact strength by a single-figure code-number (see 3.4.4). The code-numbers are separated from each other by hyphens.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 limit because of manufacturing tolerances, the designation is not affected.Not all combinations of the values of the designatory properties may be possible for currently available polymers.The viscosity number shall be determined in accordance with ISO 1628-3, using a nitrogen atmosphere.The possible values of viscosity number are divided into six ranges, each represented by a single-figure code-number, as specified in Table 2. Only materials with code-numbers 1 to 5 in Table 2 shall be used if the abrasion resistance of the material is important to the application.The elongational stress shall be determined in accordance with annex A of ISO 11542-2:1998.The possible values of the elongational stress are divided into five ranges, each represented by a single-figure code-number as specified in Table 3.MPaThe Charpy notched impact strength shall be determined in accordance with annex B of ISO 11542-2:1998.The possible values of the notched impact strength are divided into three ranges, each represented by a single-figure code-number as specified in Table 4.kJ/m2In this data block, the type of filler and/or reinforcing material is represented by a single code-letter in position 1, and the form is represented by a second code-letter in position 2, the code-letters being as specified in Table 5. Subsequently (without a space), the mass content may be given by a two-figure number in positions 3 and 4.These materials may be further defined by their chemical symbol, for example, or additional symbols defined in the relevant International Standard. In the case of metals (M), it is essential to indicate the type of metal by means of its chemical symbol.Mineral fillers should be designated more precisely if a symbol is available.Mixtures of minerals and/or forms shall be indicated by combining the relevant codes using the sign "+" and placing the whole between parentheses. For example, a mixture of 25 % glass fibres (GF) and 10 % mineral powder (MD) would be indicated by (GF25+MD10).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 shall be done for example by reference to a suitable national standard or to a standard-like, generally established specification.Only material with code-numbers 1 to 5 in Table 2 shall be used if the abrasion resistance of the material is important to the application.

Dokumentinformasjon

  • Standard fra SN
  • Publisert:
  • Tilbaketrukket:
  • Utgave: 2001-02
  • Versjon: 1
  • Varetype: NAT
  • ICS 83.080.20
  • National Committee SN/K 138/ NS 416

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