About Diversified Plastics, Inc. Employee-owned Diversified Plastics is a custom plastic-injection molder of high-precision, close-tolerance, small- to medium-sized thermoplastic parts and components for medical device, filtration, aerospace and a variety of other industrial markets. Founded in 1977, the company is a full-service contract manufacturer providing design assistance, mold construction and intricate molding as well as cleanroom assembly. Diversified Plastics is ISO 9001:2008 and 13485:2003 certified, FDA registered, ITAR certified and UL registered.