ABSTRACT
This chapter presents some of the most common tests used for extrusion blow molded parts. Testing must begin with incoming material inspection followed by in-process and finished product testing. Tensile strength is a measure of the resistance of the material to stresses pulling in opposite directions and the extent to which the material stretches before failure. Compression is the ability of a material to withstand compressive forces. In addition to testing the polymers to establish standards for evaluating material selection for a given application, a battery of end-product testing must also take place to ensure product integrity throughout the life of the part or product. Melt Index Test measures the relative flowability of the resin when melted. Capillary Rheometer Test measures the flowability of the resin under a wide range of shear stresses and shear rates to determine the shear sensitivity and flow characteristics at processing shear rates.
