Rigid Plastic #6 (Polystyrene) Put in Recycling Cart/Bin If a container once held food or liquid, empty and scrape the container as well as you can before recycling it. Containers with food and liquids can contaminate whole batches of recycling and are often sent to a landfill. 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 and a neurotoxin for humans. Find out more from EJnet.org.