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Calflex™

Heat Protection Filters

Materion Balzers Optics family of Calflex™ heat protection filters effectively remove damaging radiation from optical systems using broadband light sources. These filters combine extremely high transmission in the visible and a sharp transition to reflection in the IR. Several types of Calflex™ are available to balance cost versus performance. The products differ primarily in their IR-blocking range.

  • Calflex™ 3000 SP and B1/K1: blocking range NIR + IR
  • Calflex™ C and X SP: blocking range NIR

Heat Protection Filters

Benefits

  • Heat rejection independent of glass thickness
  • High visible transmission
  • No color degradation
  • Hard, chemically and mechanically stable dielectric oxide coating

Applications

  • Projection systems
  • Automotive headlights
  • Copiers and film readers
  • Medical lighting
  • Product showcase lighting
  • Fiber optics
  • Museum lighting
  • Imaging detectors
  • Photodiode receivers

Technical Data Overview

Product

Visible transmission

IR transmission

Thermal load*

Standard sheet size**

Calflex™ C

Tavg. > 90% 425–680 nm

Tavg. < 3% 800–1150 nm

400 °C

160 ⋅ 110 ⋅ 1.1 mm

Calflex™ X SP

Tabs. > 80% 425–680 nm

Tabs. < 1% 780–1100 nm

250 °C

160 ⋅ 110 ⋅ 1.1 mm

Calflex™ 3000 SP

Tavg. > 80% 425–680 nm

Tavg. < 3% 800–1150 nm
Tavg. < 8% 1150–2500 nm

400 °C

160 ⋅ 110 ⋅ 1.1 mm

Calflex™ B1/K1

Tavg. > 75% 400–660 nm

Tabs. < 10% 760–2600 nm

350 °C

160 ⋅ 110 ⋅ 1.8 mm

* For slow and even heating   |     All data measured at AOI = 0°

** Heat resistant glass (BOROFLOAT®, Corning Eagle XG or equivalent, IR absorption-glass)

Calflex™: Heat/light separation by reflection of IR-radiation
Spectral curve of Calflex™ 3000 SP, Calflex™ B1/K1 and radiation of black body 3000K
Spectral curve of Calflex™ C and radiation of XENON lamp
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