Seiler Plastics | ABS, Polypropylene, Polystyrene, & Polyethylene .
Extruded Plastic Sheet Materials. One of our most common plastic sheet products is High Density Polyethylene Sheet or HDPE Sheet. Its low cost, strength, and durability make it an ideal choice for many component applications. As such, we produce a large volume of 4 x 8 plastic sheets in both high and low density..