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Abbe Number (vd):
58.3
Bevel:
Protective as needed
Clear Aperture CA (mm):
18.00 x 18.00
Dimensions (mm):
20.00 x 20.00
Thickness (mm):
2.00
Coating:
Uncoated
Coefficient of Thermal Expansion CTE (10-6/°C):
9.4 (+20 to +300°C)
Density (g/cm3):
2.56
Edges:
Fine Ground
Index of Refraction nd:
1.523
Knoop Hardness (kg/mm2):
500
Poisson's Ratio:
0.22
Substrate:
Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Available Uncoated, MgF2, or VIS-NIR Anti-Reflection (AR) Coated
Custom Sizes Available for Volume OEM Requirements
TECHSPEC® B270 Windows offer a high transmission from the visible to the near-infrared (NIR). They have a similar refractive index to N-BK7 while being more cost-effective. These windows are often used as a protective element due to their high solarization stability and chemical resistance, making them ideal for standard window applications. TECHSPEC® B270 Windows are available either uncoated or coated with a MgF2 or VIS-NIR Anti-Reflection (AR) Coating. Both circular and square options are offered in various sizes, and custom sizes and coatings are available for OEM applications.
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