UNE-EN ISO 24026-1:2021

This part of ISO 24026 establishes a system of designation for poly(methyl methacrylate) (PMMA)thermoplastic material, which may be used as the basis for specifications.The types of PMMA plastic are differentiated from each other by a classification system based onappropriate levels of the designatory propertiesa) 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 part of ISO 24026 is applicable to all poly(methyl methacrylate) homopolymers and to copolymersof 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 in the form of beads, granules and pellets and to materialsunmodified or modified by colorants, additives, etc.This part of ISO 24026 does not apply to PMMA modified with elastomers.It is not intended to imply that materials having the same designation give necessarily the sameperformance. This part of ISO 24026 does not provide engineering data, performance data or data onprocessing conditions which may be required to specify a material for a particular application and/ormethod of processing.If such additional properties are required, they shall be determined in accordance with the test methodsspecified in Part 2 of this International Standard, if suitable.In order to specify a thermoplastic material for a particular application or to ensure reproducibleprocessing, additional requirements may be given in data block 5 (see clause 3, introductory paragraph).