In the plastics industry, thermal oil is used as a heating medium in extrusion processes, injection molding, blow molding, and calendaring. The high operating temperature of thermal oil enables the melting of plastic materials at higher temperatures without the risk of overheating or burning. This ensures consistent quality in the final product by preventing degradation of the plastic material.

Moreover, thermal oil systems provide precise control over the temperature within the processing equipment. This temperature control is essential for maintaining the right viscosity of the plastic during processing, which affects the flow characteristics and the final product's mechanical properties. Accurate temperature management helps in achieving uniform thickness, shape, and size in the product.