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Standard Specification for Polyethylene Plastics Molding and Extrusion

 
ASTM D4976


 

Scope:
This specification defines pertinent properties, test methods, parameters and sample preparation for the evaluation of polyethylene for molding and extrusion. Typically, different materials have unique requirements related to the generation of the specific properties. Following the requirements of this specification assures consistent characterization and valid comparisons of polyethylenes. This method provides a means to call out plastic materials for use in the manufacture of parts based on the material composition and specific physical/mechanical properties. End users, engineers, sellers, and buyers of polyethylene would in turn utilize the callout to specify a material for their particular application.

Specimen Preparation:
The specification outlines compression molding and some die-cutting of test specimens.

Conditioning:
The specification outlines 40+ hours of standard laboratory conditioning as 23C/50%RH. Individual call outs may have additional conditioning requirements.

Test Methods:
Properties are determined by following the called out methods including Melt Flow Rate (ASTM D1238), Density (ASTM D1505, ASTM D792), Tensile Testing (ASTM D638), Flexural Modulus (ASTM D790), Environmental Stress-Crack Resistance (ASTM D1693), Slow Crack Growth Resistance (ASTM F1473), Thermal Stress Crack Resistance (ASTM D2951). Additional testing is also specified.

Data:
Data is outlined by specifications called out by ASTM D4976. See individual methods for more information.


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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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