... -fiber blanket, made of common, high purity, high alumina and zirconium alumina silicate fibre cottons produced by blowing fiber forming technology ... high aluminum ones are made of composite materials of pure alumina and silica powder, which are meltdown in resistance furnaces ... .Zirconium ones are made of composite materials of high purity alumina, silica powder and zircon sands, which are meltdown in ...