Heat absorbing filters made of KG1, KG2, KG3, KG4, and KG5 filter glass materials allow removing heat energy from an optical system in a targeted manner. Such filters are also called heat-absorbing glasses due to their high optical density for infrared wavelengths. These glass filters allow the absorption of the thermal energy emitted from a light source in lighting systems. While absorbing heat, these glass filters also offer a high, almost color-neutral transmission of visible light.
Heat-absorbing filters in lighting systems get hot during operation. Therefore, the heat is efficiently dissipated from an optical system by direct cooling or ventilation of the absorbing filter glass. We recommend the filters' thermal tempering after the polishing and shaping processes whenever heat-absorbing glass must withstand an increased operating temperature.
KG-Filters not only work in lighting applications. Many other optical systems profit from the exciting properties of these standard SCHOTT glass filter materials. As the KG-absorption glasses have the advantage of a much more broadband blocking of the infrared wavelength range than coated filters (Hot Mirrors), they represent a better solution whenever you want to block a broad IR spectrum.
To get a quotation for any SCHOTT KG-filter, please click on the button below.
Use our online SCHOTTfilter calculator to analyze the transmission of all available color glass filters made of SCHOTT filter material. The calculator allows you to compute individual filter transmission curves and display the internal and the external transmittance of the glass filters, including surface reflection losses. Also, you can analyze KG-heat absorbing filters with our SCHOTT filter app.
We fabricate KG absorption filter optics from raw material in the form of unpolished filter plates. Hence, there are generally no standard thicknesses.
However, a quick delivery (typically 1-2 weeks) is possible for a filter thickness of 1 mm, 2 mm, or 3 mm up to a diameter of 49 mm or, for square parts, up to a dimension of 50 mm x 50 mm. If required, please send us your inquiry, and you will receive our offer immediately.
Further detailed information about all KG-glass filters is available on request.All given details and specifications are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specifications".
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