N-SF11是符合RoHS的重火石玻璃，它在420 nm到2.3 μm波長范圍是透明的。這種玻璃比N-BK7散射更高，但其它屬性差不多。它的折射率高、阿貝數(shù)低、散射功率高，非常適合在可見光范圍內(nèi)要求高散射的應(yīng)用。它在587.6 nm處的折射率是1.785。 N-SF11 Specifications Index of Refractiona   Index of Refraction at d-Line (587.6 nm)a 1.785 Sellmeier Equationa   Abbe Number (Vd) 25.68 Attenuation Coefficient   Transmission Range 420 nm - 2.3 μm Fresnel Reflectance and Transmittance (Calculated)   Density 3.22 g/cm3 Knoop Hardness 615 kg/mm2 Youngs Modulus 92 GPa Shear Modulus (Calculated Value) 36.6 GPa Bulk Modulus (Calculated Value) 63.1 GPa Poissons Ratio 0.257 Coefficient of Thermal Expansion 8.5 x 10-6 /°C Heat Capacity 0.710 J/(g*K) Softening Point 592 °C Change in Index of Refraction with  Temperature ( 20/ 40°C @ 1060 nm) 0.1 x 10-6 /°C