Type NAB and Type NMB are needled blankets made from shot-free high-purity alumina fiber. They are easily cut and applied to numerous applications with temperatures as high as 1600°C (2912°F). These aluminum oxide fiber blankets exhibit light weight, low thermal conductivity, low thermal mass and immunity to thermal shock. NAB’s high alpha and NMB’s mullite content give both blankets good strength and stability at elevated temperatures and in aggressive chemical environments. Both types provide utility when layered between rigid insulation and when used as insulation packing in furnace spaces, around furnace sight tubes and ports, and as fill-in expansion joints.