1.1 This part of ISO 8257 specifies procedures for moulding test specimens of PMMA materials in a specified state,and methods for measuring their properties. Any property listed in this part of ISO 8257 and referred to in combinationwith ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257.1.2 No values are quoted for these properties. Those required for the designation of PMMA materials for mouldingand extrusion are given in ISO 8257-1. Other properties shall be determined by the appropriate methods referred toin this part of ISO 8257.1.3 The values determined in accordance with this part of ISO 8257 will not necessarily be identical to those obtainedusing specimens of different dimensions and/or prepared by different procedures. They may also be influencedby colorants and other additives. The values obtained for the properties of a moulding depend on the mouldingcompound, the shape of test specimen, the test method and the state of anisotropy. The last-mentioned depends onthe gating and the moulding conditions, for example temperature, pressure or injection rate. Any subsequent treatmentmust also be considered, for example conditioning or annealing.1.4 The thermal history and the internal stresses of the specimens may strongly influence thermal and mechanicalproperties and resistance to environmental stress cracking, but exert less effect on the electrical properties, whichmainly depend on the chemical composition of the moulding compound.
1.1 This part of ISO 8257 specifies procedures for moulding test specimens of PMMA materials in a specified state,
and methods for measuring their properties. Any property listed in this part of ISO 8257 and referred to in combination
with ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257.
1.2 No values are quoted for these properties. Those required for the designation of PMMA materials for moulding
and extrusion are given in ISO 8257-1. Other properties shall be determined by the appropriate methods referred to
in this part of ISO 8257.
1.3 The values determined in accordance with this part of ISO 8257 will not necessarily be identical to those obtained
using specimens of different dimensions and/or prepared by different procedures. They may also be influenced
by colorants and other additives. The values obtained for the properties of a moulding depend on the moulding
compound, the shape of test specimen, the test method and the state of anisotropy. The last-mentioned depends on
the gating and the moulding conditions, for example temperature, pressure or injection rate. Any subsequent treatment
must also be considered, for example conditioning or annealing.
1.4 The thermal history and the internal stresses of the specimens may strongly influence thermal and mechanical
properties and resistance to environmental stress cracking, but exert less effect on the electrical properties, which
mainly depend on the chemical composition of the moulding compound.
1.1 This document specifies the methods of preparation of test specimens and the test methods to be used in determining the properties of poly(methyl methacrylate) (PMMA) moulding and extrusion materials. It gives the requirements for handling test material and for conditioning both the test material before moulding and the specimens before testing. 1.2 This document specifies procedures and conditions for the preparation of test specimens and procedures for measuring properties of the materials from which these specimens are made. It lists properties and test methods which are suitable and necessary to characterize poly(methyl methacrylate) moulding and extrusion materials. 1.3 The properties have been selected from the general test methods in ISO 10350-1. Other test methods in wide use for, or of particular significance to, these moulding and extrusion materials are also included in this document, as are the designatory properties specified in ISO 24026-1.
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