This screw and barrel are generally used on all kinds of plastic machines, such as injection molding machine or extruders etc

HPT1 is suitable for nylon, PVC, PC, aldehyde resin, glass, transparent acrylic,
Polycarbonate resin etc. HPT2 is suitable for Bakelite, PC + glass fiber, magnetic powder, porcelain powder, aluminum and magnesium powder, iron powder, electric plastic machinery etc. HPT3 possesses two unique features that HPT1 and HPT2 have possesses (wear-proof, corrosion-proof, heat-proof, high-pressure proof and high-speed proof).

The above three materials (bimetallic screw is called fully hardy screw abroad) replaced common bimetallic material and being widely used abroad.