Wacker Chemical Corporation-Silmix, 2215 International Pkwy NW, North Canton, OH 44720, US

Preferred Rubber Compounding Corporation, located in Barberton, Ohio, develops and produces black and colored organic rubber compounds. Typically, its products are purchased by rubber fabricators that process the compounds and transform them into rubber parts for the aerospace, automotive, appliance, construction, electrical and pharmaceutical industries. Preferred Rubber specializes in producing complex-process and high-performance compounds. In addition to providing compounds to a customer's proprietary recipe, the company also works closely with its clients to help develop new formulations that offer increased performance and ease-of-manufacturing characteristics. Preferred Rubber Compounding is a portfolio company of Watermill Ventures located in Waltham, Mass.