Glassfelt

Glassfelt is a term used to describe a nonwoven sheet made from glass fibers that are bonded into a felt-like mat. It can be produced with or without additional binders and is available in a range of densities and thicknesses. The material is typically produced by converting glass into short or long fibers and then forming these fibers into a continuous mat through mechanical entanglement (needling), thermobonding, or resin or latex binding.

Composition and production. Glassfelt largely consists of silica-based glass fibers. Depending on the intended use, binders or coatings may be added to improve handle, stability, or moisture resistance. The production process emphasizes control of fiber diameter, mat thickness, and bonding method to achieve the desired porosity, strength, and thermal performance.

Properties. Glassfelt is lightweight, noncombustible, and exhibits good fire resistance. It generally offers high thermal stability, chemical resistance, and dimensional stability. The porosity of the felt can provide filtration and acoustic attenuation, while its rigidity supports insulation and reinforcement roles in composites.

Applications. Common applications include filtration media for air and liquids, thermal and acoustic insulation, refractory linings, and as a substrate or reinforcement in composite materials. It is also used in some industrial packaging, gaskets, and specialty engineering applications where a stable, heat-resistant nonwoven is required.

Safety and environmental notes. Processing glassfelt can generate glass fibers in the air, which may irritate skin, eyes, and lungs; appropriate protective equipment and ventilation are advised. Recycling and disposal follow guidelines for glass fiber products and nonwoven composites.

See also. Glass fiber, fiberglass, nonwoven fabric, filtration media.