Rigid Plastic #6 (Polystyrene) Curbside Recycling #6 Plastic is not accepted in El Cerrito curbside recycling Foam Plastic #6 Is Different Foam plastic #6 is a different material than rigid plastic #6, so it has different disposal options. Rigid plastic #6 is smooth and glossy, while foam plastic #6 is porous and dull. Find out how to dispose of foam plastic #6. Did You Know? What Items Are Made From Rigid Plastic #6? Items made from rigid plastic #6 include disposable plastic cups, lids for paper coffee cups, CD and DVD cases, clothes hangers and plastic utensils. Plastic in Our Bodies Styrene, a component of polystyrene, has been found in 100 percent of human fat tissue samples dating back to 1986. It is known to cause cancer in animals, and suspected to be both cancerous for humans as well.