<p><b>1.1 </b>This part of ISO 8257 specifies procedures for moulding test specimens of PMMA materials in a specified state,</p>
<p>and methods for measuring their properties. Any property listed in this part of ISO 8257 and referred to in combination</p>
<p>with ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257.</p>
<p><b>1.2 </b>No values are quoted for these properties. Those required for the designation of PMMA materials for moulding</p>
<p>and extrusion are given in ISO 8257-1. Other properties shall be determined by the appropriate methods referred to</p>
<p>in this part of ISO 8257.</p>
<p><b>1.3 </b>The values determined in accordance with this part of ISO 8257 will not necessarily be identical to those obtained</p>
<p>using specimens of different dimensions and/or prepared by different procedures. They may also be influenced</p>
<p>by colorants and other additives. The values obtained for the properties of a moulding depend on the moulding</p>
<p>compound, the shape of test specimen, the test method and the state of anisotropy. The last-mentioned depends on</p>
<p>the gating and the moulding conditions, for example temperature, pressure or injection rate. Any subsequent treatment</p>
<p>must also be considered, for example conditioning or annealing.</p>
<p><b>1.4 </b>The thermal history and the internal stresses of the specimens may strongly influence thermal and mechanical</p>
<p>properties and resistance to environmental stress cracking, but exert less effect on the electrical properties, which</p>
<p>mainly depend on the chemical composition of the moulding compound.</p>
Registration number (WIID)
26816
Scope
<p><b>1.1 </b>This part of ISO 8257 specifies procedures for moulding test specimens of PMMA materials in a specified state,</p>
<p>and methods for measuring their properties. Any property listed in this part of ISO 8257 and referred to in combination</p>
<p>with ISO 8257-1 shall be determined by the method referred to in this part of ISO 8257.</p>
<p><b>1.2 </b>No values are quoted for these properties. Those required for the designation of PMMA materials for moulding</p>
<p>and extrusion are given in ISO 8257-1. Other properties shall be determined by the appropriate methods referred to</p>
<p>in this part of ISO 8257.</p>
<p><b>1.3 </b>The values determined in accordance with this part of ISO 8257 will not necessarily be identical to those obtained</p>
<p>using specimens of different dimensions and/or prepared by different procedures. They may also be influenced</p>
<p>by colorants and other additives. The values obtained for the properties of a moulding depend on the moulding</p>
<p>compound, the shape of test specimen, the test method and the state of anisotropy. The last-mentioned depends on</p>
<p>the gating and the moulding conditions, for example temperature, pressure or injection rate. Any subsequent treatment</p>
<p>must also be considered, for example conditioning or annealing.</p>
<p><b>1.4 </b>The thermal history and the internal stresses of the specimens may strongly influence thermal and mechanical</p>
<p>properties and resistance to environmental stress cracking, but exert less effect on the electrical properties, which</p>
<p>mainly depend on the chemical composition of the moulding compound.</p>
