Rigid Plastic #6 (Polystyrene) Put in Garbage Foam Plastic #6 Is Not Recyclable Foam plastic #6 is not recyclable. However, there are many alternative programs that can reuse foam materials. 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.