Profile: Oscoda Plastics, Inc. produces Proflex, a recycled vinyl concrete expansion joint filler. Proflex is extremely durable and flexible, and can be used as a form, it will not rot, crack, or deteriorate. Proflex will also accept a stain for use in decorative concrete applications. Proflex vinyl expansion joint filler is manufactured in the USA from post-industrial vinyls obtained from the roofing and automotive industries.