The first step in Entech’s plastics operation is compounding. Their chemist determines the optimal ratios of resins and fillers based on the requirements of a final part. Factors such as weatherability, flexibility, impact resistance, stress resistance, surface finish, dimensional tolerances and cost are all considered. By having their own compounding line, Entech is able to experiment with a variety of formulations. The gravimetric feeder shown here ensures the compound ratios are properly delivered to the extruder.