Materials in Plastic Screw Conveyor Plastic screw conveyors are light in weight, inexpensive to fabricate and repair, corrosion and chemical-resistant, and able to withstand high temperatures. They can also handle abrasive wear. Plastics like PU Products, polyethylene, and polypropylene can be Injection Molding to become these conveying systems. Polyurethane screw conveyors are acid resistant, durable, and at times more wear resistant than steel. Polypropylene and polyethylene exhibit a smooth surface, making them easy to clean and sterilize. They are therefore used as a food grade material that will not contaminate edible material and is used in the food and beverage processing industries. All three of these thermoplastic materials can also withstand high temperatures without melting, burning, or chemically changing. Plastic screw conveyors can be easier to handle and replace than other kinds of conveyors, and they can convey loose, granular, powder, and pellet materials. The food, chemical, and mineral processing, wastewater treatment, and construction industries all use screw conveyors made of plastic in plants and manufacturing facilities as components in large processing lines.