Insulation (Loose-Fill Fiberglass) Hazardous Waste Insulation Is Hazardous Waste Loose-fill fiberglass insulation can contain toxic materials such as formaldehyde and asbestos that can leach into the ground and damage ecosystems, so never toss insulation in the garbage. Dispose of it as hazardous waste. When Handling, Stay Covered Insulation can cause irritation or damage to your skin, eyes and lungs. In addition to thick work gloves, safety goggles and a dust mask, wear long, loose layers you don’t mind tossing afterward, and keep your head covered as well. If insulation touches your skin, don’t rub it. Wash it thoroughly instead. Double Bag Insulation Use thick, durable plastic bags, also known as contractor bags, to dispose of insulation. Once you’ve filled a bag, place it inside a second bag to keep it extra secure. Ways to Reduce Opt for a Greener Insulation Natural fibers such as cotton and wool make excellent insulation that’s more eco-friendly than conventional fiberglass insulation. Paper or cellulose can also be used as insulation. Ways to Reuse Return to a Manufacturer Fiberglass insulation manufacturers may accept used loose-fill fiberglass insulation for recycling.