Manager Sales and Marketing

Jonas Nicoll
Manager Sales and Marketing

telefon +49 7121 894-181
jonas.nicoll@berghof.com

Engineered Parts made from Optical PTFE

Engineered Parts made from Optical PTFE

Due to the processing using the press-sinter process, Optical PTFE by Berghof gets its robust material structure, comparable with the one of HD Polyethylene. This structure provides a good mechanical workability. Therefore, we can manufacture dimensionally stable reflectors and engineered parts in various geometries with this material – for example self-supporting integrated spheres or laser cavities. During processing, the special, lambertian surface structure remains; it makes our Optical PTFE a material with the highest known diffuse reflection of up to >99 percent in the UV-VIS-NIR range. Berghof Fluoroplastics offers a variety of options in mechanical processing. Starting with quick prototypes up to the implementation of large-scale production – we are always the right partner!

Integrated Spheres

The unique diffuse reflection properties and the mechanical stability of our Optical PTFE makes it the ideal material for reliable optical measurements. Berghof produces for example complex spherical geometries that are the centerpiece of optical measurement instruments such as spectral photometers. However, it is also used for self-supporting integrated spheres. Typically, we manufacture Optical PTFE integrated spheres and accessories based on drawings. For larger geometries, isostatic molding with precise contours allows a ressource-friendly use of this high-quality material.

Advantages

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

  • Robust surface, more robust against abrasion than comparable surface coatings
  • Surface homogeneity +/– 1 %R

  • High energy density limit of up to ~8 J/cm³ (laser damage threshold)

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

  • Highest UV stability and universal chemical resistance, no discoloration

  • Dimensionally stable and flexible in shape

Reflectance Standards

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.

Advantages

  • 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/cm³ (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

Applications

Calibration of

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

 

Linearity testing of

  • Detector systems

  • Colorimeters

  • Densitometers

  • Spectrophotometers

     

     

Other Topics