BS ISO 20558-1-2018 pdf free download.Plastics — Poly(phenylene sulfide) (PPS) moulding and extrusion materials Part 1: Designation system and basis for specifications
This document establishes a system of designation for poly(phenylene sulfide) (PPS) thermoplastic materials, which can be used as the basis for specifications.
The types of poly(phenylene sulfide) (PPS) materials are differentiated from each other by a classification system based on appropriate levels of the designatory properties
a) melt mass-flow rate or melt viscosity;
b) density;
c) tensile modulus;
and on information about the intended application and/or method of processing, important
properties, additives, colorants, fillers and reinforcing materials.
This document is applicable to all PPS materials. 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 document does not provide engineering data, performance data or data on processing conditions which can be required to specify a material for a particular application and/or method of processing. If such additional properties are required, they are intended to be determined in accordance with the test methods specified in ISO 20558-2, if suitable.
In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, the requirements are given in data block 5 (see 4.1).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 20558‑2, Plastics — Poly(phenylene sulfide) (PPS) moulding and extrusion materials — Part 2:Preparation of test specimens and determination of properties
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Designation system
4.1 General
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 PPE in accordance with ISO 1043‑1 and information about the composition of the polymer (see 4.2).
— Data block 2: Fillers or reinforcing materials and their nominal content (see 4.3).
— Data block 3: Position 1: intended application or method of processing (see 4.4).
Positions 2 to 8: important properties, additives and supplementary information (see 4.4).
— Data block 4: Designatory properties (see 4.5).
— Data block 5: For the purposes of specifications, a fifth data block may be added containing addi‑tional information (see 4.6).
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 (,,).
4.2 Data block 1
In this data block, after the hyphen, poly(phenylene sulfide) materials are identified by the symbol PPS,in accordance with ISO 1043‑1.
4.3 Data block 2
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 1. Subsequently (without a space), the mass content may be given by a two-figure number in position 3.
Mixtures of materials and/or forms may be indicated by combining the relevant codes using the sign “+” and placing the whole between parentheses.
EXAMPLE A mixture of 25 % glass fibre (GF) and 10 % mineral powder (MD) would be indicated by (GF25 + MD10) or (GF + MD)35.BS ISO 20558-1 pdf download