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Heat Reflection Filters

Heat reflecting filter coatings with extended blocking range

SIR-IR Series

Special Properties

  • Broadband blocking of infrared light
  • Good visible transmission
  • Operating temperature up to 250 °C
  • Dielectric multi-layer coating

Typical Applications

  • Broadband heat protecting filters
  • Sensor and measurement applications
  • Automotive filter applications
  • Medical lighting filter
  • Projector and lighting systems

Related filters and coatings

The SIR-IR heat-reflection filter optics design represents the best compromise between frequently requested filter characteristics and realizability. It features an extended blocking range up to 2500 nm. The transmission offered by the SIR-IR filters in the visible spectrum is not as high and neutral as that of our highly transparent SIR heat-reflecting hot mirror. However, this slightly lower transparency in the visible spectrum enables a much broader blocking capability for infrared light radiation. At sufficient order quantities, we can adapt the cut-on wavelengths of the filters to individual requirements.


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Transmission curve of the SIR-IR filter

Standard Thicknesses

(Please click on glass thickness to request a quote)

Thickness (mm)


48h-Express Service
2.00 ±0.20 -
Custom thicknesses are available on request

Product Code

  • SIR-IR heat-reflection filters


  • High-temperature borosilicate glass
  • Other on request


  • Other cut-ons or cut-offs are possible per coating run on request

Operating Temperature

  • up to 250 °C


  • Depending on substrate material and thickness
  • Other on request

Surface Quality

  • typ. 80-50 scratch & dig (MIL-0-13830A)
  • Other on request

Other Specifications

  • Adherence according to MIL-C-675 C (tape test)
  • Abrasion-resistant according to MIL-M-13508 C
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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Last update: May 21, 2024