ASTM D3641 – Standard Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials
Description:
Significance and Use
5.1 It is well known that plastic test specimens molded under different conditions can have significantly different properties. This practice is designed to minimize those differences by establishing operating protocols without being unnecessarily restrictive.
5.2 Always refer to the ASTM material specification or ISO designation for the material for recommended molding conditions. If not available, consult the material supplier.
5.3 This practice requires the use of adequate quantities of plastic material to find desirable operating conditions and to make the desired test specimens.
Scope
1.1 This practice covers the general principles to be followed when injection molding test specimens of thermoplastic molding and extrusion materials. This practice is used to obtain uniformity in methods of describing the various steps of the injection molding process and to set up uniform methods of reporting these conditions. The exact conditions required to prepare suitable specimens will vary for each plastic material. Any requirements or recommendations in the material specification that differ from this standard take precedence over those in this standard. Always consult the referenced material document for specimen preparation. If no referenced document exists, then consult the material supplier for specimen preparation guidance and note such in the test report.
1.2 The methodology presented assumes the use of reciprocating screw injection molding machines.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
ASTM D3638