Sorry, this product is no longer offered for sale. It was discontinued on Jun 11, 2025The recommended replacement product is FSR-KG5-C.
Heat Absorbing Glass Filter, 25.4 mm Diameter, IR Cut-off, KG-5 Glass
The FSR-KG5 Heat Absorbing Glass Filter is a 25.4 mm diameter infrared (IR) cut-off filter made of Schott KG5 filter glass. Heat absorbing glass filters reduce the heat transmitted through an optical system. They have high transmission in the visible wavelength region and absorb in the IR wavelength region, making them also useful as a shortpass filter. These absorption filters are precision polished for demanding research or OEM applications.
This filter is extremely susceptible to high humidity. The filter will absorb moisture, and discoloration may happen. Please store this in a low humidity environment.
Specifications
- TypeHeat Absorbing Filter
- MaterialSchott KG5 or equivalent
- Center WavelengthVIS
- Angle of Incidence0°
- SizeØ25.4 mm
- Size Tolerance±0.3 mm
- Thickness2.0 to 3.0 mm, typical
- Surface Flatness≤2λ at 632.8 nm over the clear aperture
- Surface Quality60-40 scratch-dig
- Damage Threshold30 W/cm2 CW, Typical
- Wedge≤3 arc min
- Clear Aperturecentral ≥ 80% of diameter
- ChamfersUp to 1 mm face width
- Chamfers Angle Tolerance45° ±15°
- Cleaning
Resources & Downloads
2D Product Drawings
FBR-NDXX-S(62 kB, PDF)
Other
FSR-KG5 RoHS Certificate(703.9 kB, PDF)
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