Classifying Test

Properties of plastics such as physical, mechanical, and chemical are governed by their molecular weight, molecular weight distribution, molecular structure, and other molecular parameters; also the additives, fillers, and reinforcements that enhance certain processing and/or performance characteristics (Chapter 1). Properties are also effected by their previous history (includes recycled plastics), since the trans-ormation of plastic materials into products is through the application of heat and pressure involving many different fabricating processes. Thus, variations in properties of products can occur even when the same plastic and processing equipment are used. Conducting tests such as those related to molecular characteristics and melt flow provides a means of classifying them based on test results.

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