Manager Sales and Marketing

Jonas Nicoll
Manager Sales and Marketing

telefon +49 7121 894-181

Reflectance Standards made from Optopolymer®

Reflectance standards made from ultrapure Optical PTFE by Berghof are used for calibration of optical instruments in the optical measurement technology. The special surface structure of the material results in a diffuse, lambertian reflection of up to >99 %R. When adding specific black pigments, they can also be produced in further gray scales. Due to the high material thickness of the volume reflectors of 10 mm, the highest possible diffuse reflection of a wide wave length (250–2,500 nm) can be reached and therefore makes the reflectance standards a perfect reference measurement area for calibration or the white balance of optical devices. Another advantage: The measurement area can be cleaned through the removal of the top, contaminated material layer.


  • Extremely diffuse reflection of up to >99 %R, evenly across a wide wave length of ~250–2,500 nm

  • Refractive index ~1,38

  • Surface homogeneity +/– 0,1 %R

  • High energy density limit of up to ~8 J/cm² (laser damage threshold)

  • Different gray scales for calibrated reflection: 70, 50, 20, 5, 2 %R

  • Surface homogeneity (gray scales) +/– 1 %R

  • Linearity of spectrum (gray scales) +/– 0,5 %

  • Temperature resistance of –200 to +260 °C (temporarily +300 °C)

  • Highest UV stability and universal chemical resistance, no discoloration

  • Easy, mechanical cleaning


Calibration of

  • Colorimeters
  • Radiometers
  • Photometers
  • Spectrophotometers
  • Densitometers
  • Integrated spheres systems
  • Reflectometers


Linearity testing of

  • Detector systems

  • Colorimeters

  • Densitometers

  • Spectrophotometers