The most common polymer for use in sheet extrusion continues to be Polystyrene. It is the dominant material for thermoformed packaging and competes with ABS and PP in technical markets. End use applications include tubs and pots for yogurt, margarine, and desserts. Thermoformed packaging is also used in many other applications in the food industry for packing various kinds of products.

After (PVC), (PE) is the most widely used thermoplastic piping material.

Polyethylenes (HDPE, LDPE and LLDPE are the most common resins in use, but a wide variety of other materials can be used as blends with these resins or as single layers in a multi-layer film structure. These include pp, pa, evoh. In some cases, these materials do not gel together, so a multi-layer film would delaminate. To overcome this, small layers of special adhesive resins are used in between.