- Formex Manufacturing, Inc. began thermoforming quality plastic products in 1961. Our proprietary lines include 23 sizes of dock floats for the marine industry, various models of transformer pads, duct spacers, duct terminators, bore spacers for the utility market and assorted fiber optics enclosures for the telecommunications trade. In addition, Formex Manufacturing, Inc. is a heavy gauge, ...www.formex.com