loosefill

Loose-fill refers to materials that are supplied as small particles or fibers and can be poured, blown, or spread to occupy volume in spaces that are irregular or hard to reach. It is used in two common industries: building insulation and packaging cushioning. In insulation, loose-fill materials are designed to fill attic spaces, wall cavities, and other voids to reduce heat transfer and improve air sealing. In packaging, loose-fill products act as protective cushioning to absorb impact during shipping.

In insulation applications, the most common loose-fill materials are cellulose, fiberglass, and mineral wool, with occasional use of perlite or recycled aggregates. These materials are installed with specialized equipment that blows or pours them into cavities. Good performance depends on proper installation, including achieving the intended density and avoiding gaps. Cellulose insulation is typically treated with fire retardants, while fiberglass and mineral wool are largely noncombustible. Loose-fill insulation can settle over time, which may reduce its effective R-value and thermal performance. Moisture intrusion and pest exposure are considerations in some environments, and installation practices often include moisture barriers and venting strategies.

In packaging, loose-fill cushioning is used to protect items during shipping and handling. Common forms include expanded polystyrene, starch-based packing peanuts, and other biodegradable or compostable materials. Packaging loose-fill is valued for its ability to conform to odd shapes but raises environmental considerations; starch-based and other biodegradable options aim to reduce landfill impact and improve recyclability, though disposal facilities vary in capability.

Overall, loose-fill is a versatile material category chosen for its ability to fill irregular spaces, with selection driven by performance requirements, installation or handling practices, and environmental considerations.