Foam Plastic #6 (Polystyrene) Garbage Bin Help Prevent Litter Plastic #6 is a lightweight material that easily finds its way into the environment, where it can leach toxic chemicals. Make sure plastic #6 doesn’t blow away by disposing of it properly. Ways to Reuse Reuse Foam at Home Use foam to refill cushions or stuffed animals that have lost their loft. Did You Know? Plankton Eating Polystyrene In the ocean, plastic is being consumed all the way down the food chain. For the first time ever, scientists have recorded plankton eating tiny polystyrene beads. Find out more at New Scientist. 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.