Measurement of Particulate Properties

1) Materials which have good hopper flow may well have poor screw conveying, and vice versa. 

2) There is a general lack of standards and readily available testing equipment suitable for testing plastics pellets and other particulate forms such as flake, crumb, shredded film, etc. 

There are both general standards and specific standards for such properties as apparent density, bulk factor and pourability of plastic materials, e.g., ASTM D1895 [2, 3]. 

---