Heat Reflection Filters with Extended Blocking Range

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

• SCHOTT Heat Absorbing Filters
  (KG1, KG2, KG3, KG4, & KG5)
• SIR-Series
  (dielectric hot mirrors)

Higher rejection of infrared radiation

The SIR-IR heat-reflection filter design represents the best compromise between frequently requested filter characteristics and realizability. It features an extended blocking range of 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 filter coating to individual requirements.

The SIR-IR is coated on selected BOROFLOAT® 33 substrates. Other substrate materials are possible on a per-coating-run basis.

 

To request an SIR-IR at custom dimensions, please click the button below:

 

Request for Quotation

 

Specifications

Transmission curve of the SIR-IR filter

Standard Thicknesses

(Please click on glass thickness to request a quote)

Thickness (mm)	Tolerance
2.00	±0.20	-
Custom thicknesses are available on request

Product Code

• SIR-IR heat-reflection filters

Substrates

• High-temperature borosilicate glass
• Other substrates on request

Coating

• Other cut-on or cut-off wavelengths are possible per coating run on request

Operating Temperature

• up to 250 °C

Flatness

• Depending on substrate material and thickness
• Defined flatness on request

Surface Quality

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

Other Specifications

• Adherence according to MIL-C-675 C (tape test)
• Abrasion-resistant according to MIL-M-13508 C

All data and specifications given are average guide values and are not guaranteed. Moreover, please consider the “Notes on Specifications”.

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Last update: November 21, 2025