AMETEK Westchester Plastics is among the nations leading toll compounders of engineering resins, alloys, blends, reactive modifiers and other thermoplastic materials. The company s production is backed by complete design-engineering laboratories. It maintains an expansive indoor warehouse and silo storage for raw materials and finished products. AMETEK Westchester Plastics is a subsidiary of AMETEK, a leading technology company with over thirty manufacturing plants worldwide. The company was established in 1948 and has a location in Nesquehoning, Pa.