BS EN ISO 24026-1 pdf free download

BS EN ISO 24026-1-2020 pdf free download.Plastics –  Poly(methyl methacrylate) (PMMA) moulding and extrusion materials – Part 1: Designation system and basis for specifications (ISO 24026-1:2020).
This document establishes a system of designation for poly(methyl methacrylate) (PMMA) thermoplastic material, which can be used as the basis for specifications.
The types of PMMA plastic are differentiated from each other by a classification system based on appropriate levels of the designatory properties:
a) Vicat softening temperature;
b) melt mass-flow rate;
c) viscosity number (optional);
and on information about the intended application and/or method of processing, important properties,additives and colorants.
This document is applicable to all poly(methyl methacrylate) homopolymers and to copolymers of
methyl methacrylate (MMA) containing at least a mass percentage of 80 % of MMA and not more than a
mass percentage of 20 % of acrylic esters or other monomers.
This document applies to materials ready for normal use in the form of beads, granules and pellets and to materials unmodified or modified by colorants, additives, etc. It does not apply to PMMA modified with elastomers.
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 might be required to specify a material for a particular application and/or method of processing.
If such additional properties are required, they are, if suitable, determined using the test methods specified in ISO 24026-2.
In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, additional requirements can be 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 24026-2, Plastics — Poly(methyl methacrylate) (PMMA) 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:
— ISO Online browsing platform: available at https:// www .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Designation system
4.1 General
The designation system for thermoplastics is based on the following standard 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 PMMA in accordance with ISO 1043-1 (see 4.2).
Data block 2: Fillers or reinforcing materials and their nominal content (not included in this docu- ment) (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 purpose of alternative specifications, a fifth data block may be added containing additional information.
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(methyl methacrylate) plastics are identified by the symbol“PMMA”, in accordance with ISO 1043-1.
4.3 Data block 2
This data block, employed to represent filler and/or reinforcing materials, is not used in this document.BS EN ISO 24026-1 pdf download.