<p><b>1.1 </b>This part of ISO 1622 establishes a system of designation for polystyrene thermoplastic material, which</p>
<p>may be used as the basis for specifications.</p>
<p><b>1.2 </b>The types of polystyrene plastics are differentiated from each other by a classification system based on</p>
<p>appropriate levels of the designatory properties</p>
<p>a) Vicat softening temperature and</p>
<p>b) melt volume-flow rate</p>
<p>and on information about the intended application and/or method of processing, important properties, additives</p>
<p>and colorants.</p>
<p><b>1.3 </b>This part of ISO 1622 is applicable to all amorphous polystyrene homopolymers.</p>
<p>It applies to materials ready for normal use, unmodified or modified by colorants, additives, fillers, etc.</p>
<p>This part of ISO 1622 does not apply to expanded polystyrene, styrene copolymers, homopolymers of</p>
<p>substituted styrene or those modified with other polymers such as elastomers.</p>
<p><b>1.4 </b>It is not intended to imply that materials having the same designation give necessarily the same</p>
<p>performance. This part of ISO 1622 does not provide engineering data, performance data or data on processing</p>
<p>conditions which might be required to specify a material for a particular application and/or method of processing.</p>
<p>If such additional properties are required, they shall be determined in accordance with the test methods</p>
<p>specified in Part 2 of this International Standard, if suitable.</p>
<p><b>1.5 </b>In order to specify a thermoplastic material for a particular application or to ensure reproducible processing,</p>
<p>additional requirements may be given in data block 5 (see 3.1).</p>
Registration number (WIID)
55459
Scope
<p><b>1.1 </b>This part of ISO 1622 establishes a system of designation for polystyrene thermoplastic material, which</p>
<p>may be used as the basis for specifications.</p>
<p><b>1.2 </b>The types of polystyrene plastics are differentiated from each other by a classification system based on</p>
<p>appropriate levels of the designatory properties</p>
<p>a) Vicat softening temperature and</p>
<p>b) melt volume-flow rate</p>
<p>and on information about the intended application and/or method of processing, important properties, additives</p>
<p>and colorants.</p>
<p><b>1.3 </b>This part of ISO 1622 is applicable to all amorphous polystyrene homopolymers.</p>
<p>It applies to materials ready for normal use, unmodified or modified by colorants, additives, fillers, etc.</p>
<p>This part of ISO 1622 does not apply to expanded polystyrene, styrene copolymers, homopolymers of</p>
<p>substituted styrene or those modified with other polymers such as elastomers.</p>
<p><b>1.4 </b>It is not intended to imply that materials having the same designation give necessarily the same</p>
<p>performance. This part of ISO 1622 does not provide engineering data, performance data or data on processing</p>
<p>conditions which might be required to specify a material for a particular application and/or method of processing.</p>
<p>If such additional properties are required, they shall be determined in accordance with the test methods</p>
<p>specified in Part 2 of this International Standard, if suitable.</p>
<p><b>1.5 </b>In order to specify a thermoplastic material for a particular application or to ensure reproducible processing,</p>
<p>additional requirements may be given in data block 5 (see 3.1).</p>
