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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

25mm Diameter Uncoated, B270 Window

See More by SCHOTT Optical Components
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Stock #45-640 10 to 12 days
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₹2,696
Qty 1-5
₹2,696
Qty 6+
₹2,164
Volume Pricing
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Specifications

General

Type:
Protective Window

Physical & Mechanical Properties

Bevel:
Protective as needed
Clear Aperture CA (mm):
22.50
Diameter (mm):
25.00 ±0.25
Thickness (mm):
2.00
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
500
Poisson's Ratio:
0.22
Young's Modulus (GPa):
71.5

Optical Properties

Abbe Number (vd):
58.3
Coating:
Uncoated
Index of Refraction (nd):
1.523
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Flatness (P-V):
Surface Quality:
60-40
Wavelength Range (nm):
360 - 2700

Material Properties

Coefficient of Thermal Expansion CTE (10-6/°C):
9.4 (+20 to +300°C)
Density (g/cm3):
2.56

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
REACH 241:

Product Details

  • 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. 

Technical Information

Related Products

Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.

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