Rigid Plastic #6 (Polystyrene) Put in Recycling Cart There are different types of plastic #6. Rigid plastic #6 is used to make items such as CD and DVD cases, plastic utensils and plastic cups. Rigid plastic #6 is accepted in your curbside recycling cart. Foam Plastic #6 Is Not the Same Foam plastic #6 is a different material than rigid plastic #6, so it has different disposal options. Whereas rigid plastic #6 is smooth and glossy, foam plastic #6 is porous and dull. Find out how to dispose of foam plastic #6. Did You Know? 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.