MSE PRO 100 mm SCHOTT N-BK7 Glass Wafer, 500 um Thick, DSP, w/ Bevel, Primary Flat Only

100 mm SCHOTT N-BK7 Glass Wafer, 500 um Thick, DSP, w/ Bevel, Primary Flat Only

SCHOTT N-BK7 is a borosilicate high purity clear optical glass which has unique features such as: excellent optical quality, uniform transmission in visible wave range, free of bubbles and inclusions and very high refractive index homogeneity. It is widely used for optical applications, such as crowns, windows, lenses, prisms, sensor-technology use and substrates for mirror and filter coatings.

Order 100mm SCHOTT N-BK7 glass wafers with the best price on the market from a trusted materials science supplier, MSE Supplies.

Product Number: WA1301

Material: SCHOTT N-BK7 borosilicate glass

Grade: Optical Grade

Diameter: 100 +/- 0.1 mm

Thickness: 500 +/- 25 um

Bow < 30 um

Surface Polishing: Double Side Polished (DSP) with surface roughness Ra < 1 nm on both the top surface and bottom surface

Surface Finish: S/D 60/40, Top side Ra <1nm, Backside Ra <1nm

Physical Properties of BK7

• Density: 2,51 g/cm³
• Refractive index: 1.52
• Young's modulus E: 82 x 10³ N/mm²
• Poisson's ratio μ: 0,206
• Knoop hardness HK_0,1/20: 610
• Coefficient of expansion:
  • 7,1 x10^-6/K (-30 °C to +70 °C)
  • 8,3 x10^-6/K (+20 °C to +300 °C)
• Viscosity:
  • Softening Point (10^7,6 dPa): 719 °C
  • Annealing Point (10¹³ dPa): 557 °C
• Transformation temperature Tg: 557 °C
• Thermal conductivity: 1,114 W/(m x K)
• Specific heat capacity: 0,858 J/(g x K)
  (20 °C; 100°C)