N-SF11是符合RoHS的重火石玻璃，它在420 nm到2.3 µm波长范围是透明的。这种玻璃比N-BK7散射  ，但其它属性差不多。它的折射率高、阿贝数低、散射功率高，非常适合在可见光范围内要求高散射的应用。它在587.6 nm处的折射率是1.785。
 
 
 
 
  
 
   
 
N-SF11 Specifications
 
 
  
 
  
 
   
 
Index of Refraction at d-Line (587.6 nm)a
 
 
   
 
1.785
 
 
  
 
  
 
   
 
Abbe Number (Vd)
 
 
   
 
25.68
 
 
  
 
  
 
   
 
Transmission Range
 
 
   
 
420 nm - 2.3 µm
 
 
  
 
  
 
   
 
Density
 
 
   
 
3.22 g/cm3
 
 
  
 
  
 
   
 
Knoop Hardness
 
 
   
 
615 kg/mm2
 
 
  
 
  
 
   
 
Young's Modulus
 
 
   
 
92 GPa
 
 
  
 
  
 
   
 
Shear Modulus (Calculated Value)
 
 
   
 
36.6 GPa
 
 
  
 
  
 
   
 
Bulk Modulus (Calculated Value)
 
 
   
 
63.1 GPa
 
 
  
 
  
 
   
 
Poisson's 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