Optical filters picture, Hot Mirrors
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Hot Mirrors
Heat Reflecting Filters


Special Properties

  • Very high infrared reflection up to 1100nm
  • High and neutral visible transmission
  • High operating temperature (up to 400°C)
  • 100% dielectric multilayer coating

Typical Applications

  • Color neutral and efficient heat/light separation
    (Lighting filters)
  • IR-Filters or CCD-Filters for camera chips
  • Sensor- and measurement applications
  • Detector trimmers
  • Heat filters
  • Infared mirrors and infrared filters
  • Eye tracking mirrors
  • Heat mirrors in lighting systems
  • Projector light sources

Hot Mirrors are used to filter out the undesired heat from a light source or to reflect infrared light while transmitting the visible spectrum. Our SIR heat reflecting hot mirror has a decisive Hot Mirroradvantage over common hot mirrors or heat absorbing filters. The transmission of visible light is higher and more color neutral, while the heat radiation up to 1100nm is reflected significantly more efficiently. Because of its all dielectric coating construction and the heat resistant high quality BOROFLOAT® substrate, our SIR hot mirror can be used at high operating temperatures. The standard SIR coating withstands operating temperatures of up to 400°C and the heat reflecting filters do not get as hot as heat absorbing filters, because the infrared light or heat energy is reflected, not absorbed. The dielectric coating design makes our SIR resistant to humidity and many other environmental conditions.

All of our hot mirror coatings can be modified in regards to transmission and reflection ranges, as well as to the cut-on and cut-off wavelengths. Please use our custom coating inquiry form to conveniently request your customized hot mirror.

To request our SIR hot mirror with individual dimensions, please click the button below:

Request SIR hot mirror


SIR Hot Mirror transmission curve

Show transmission of your SIR hot mirrors


Product Code

  • SIR



  • 100% dielectric
  • Other cut-ons / cut-offs on request

Operating Temperature

  • up to 400°C


Surface Quality

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

Standard thicknesses

  • 1,1mm / 1,75mm / 3,3mm

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. In addition, please consider our "Notes on technical specifications"