3MNextel440高温纤维布技术指标：PropertyUnitsNextel？440SizingColorcolorcoralChemicalCompositionwt.%70Al2O328SiO22B2O3MeltingPoint？F(？C)3272(1800)FilamentDiameterμm10-12Denier/NominalFilamentCountTex/NominalFilamentCountg/9000mg/1000m700/4001000/4002000/75078/400111/400222/750CrystalSizenm<500CrystalPhaseγ-Al2O3+Mullite+amorphousSi02Densityg/cc3.05RefractiveIndex1.614SurfaceAream2/g<0.2FilamentTensileStrength(25.4mmgauge)MPaksi2000290FilamentTensileModulusGPamsi19027ThermalExpansion(100-1100？C)ppm/？C5.3DielectricConstant(@9.375GHz)5.7LossTangent(@9.375GHz)0.015SpecificHeat@500？C(932？F)cal/g/？CorBTU/lb/？F0.27