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All Products / Optics / Windows and Diffusers / Visible Windows / B270 Windows
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

20mm Square, Uncoated, B270 Window

See More by SCHOTT Optical Components

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Stock #64-087 3-4 days
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Quantity Selector - Use the plus and minus buttons to adjust the quantity. +
£13.60 £27.20
Qty 1-5
£13.60 £27.20
Qty 6+
£10.84 £21.68
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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
B270
Surface Flatness (P-V):
1λ
Surface Quality:
60-40
Type:
Protective Window
Wavelength Range (nm):
360 - 2700
Young's Modulus (GPa):
71.5
Length (mm):
20.00
Width (mm):
20.00

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 235:
Compliant
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Product Family Description

  • Large Selection of Sizes
  • 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.