Nextel® 440 Alumina/Silica/Boria Fiber (Al₂O₃70/SiO₂28/B₂O₃2)

Nextel® 440 Alumina Silica Boria Fiber (Al₂O₃70/SiO₂28/B₂O₃2) delivers the same clean, flexible textile format as other Nextel grades with an emphasis on strength retention and surface integrity at elevated temperature. It can be woven, sewn, or layered like a conventional fabric, yet resists oxidation and chemical attack during demanding duty cycles. Aerospace, power generation, and materials processing deploy it where insulation must live beside vibration, fasteners, and frequent thermal swings without fraying or turning brittle. Common uses include flame barriers and thermal shields, furnace and kiln curtains, door seals and gaskets, and reinforcing plies in ceramic or polymer composites that must keep their shape under stress. Its inherent electrical insulation simplifies stack‑ups around power electronics and instrumentation, helping to shrink envelope and weight. The fabric’s low outgassing and clean handling support vacuum and optical equipment. For engineers and researchers, Nextel 440 is a robust, lightweight solution for managing heat and protecting sensitive parts while simplifying installation and ongoing service.