Porous PTFE material exhibits high reflectivity
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FTL Seals Technology product story
Edited by the Engineeringtalk editorial team
May 20, 2003
A novel porous PTFE-based material offers many advantages to companies concerned with optical technology and lighting engineering.
Working in conjunction with Elring Klinger Plastics Technology (EKPT) of Bittigheim, Stuttgart, FTL Seals Technology has developed a PTFE-based material that offers many advantages to companies concerned with optical technology and lighting engineering.
Manufactured at the company's Heidenheim plant this modified PTFE material not only possess the inherent "normal" properties of PTFE such as a high working temperature up to 260C, low coefficient of friction and resistance to chemical attack but also several unique optical characteristics which make it particularly suitable for optical calibration and standards work.
Porous PTFE has a higher "degree of whiteness" than any other material.
Lambertian surfaces are materials that are able to reflect diffused light evenly and in all directions with little or no loss in light value from that of the originating source.
This makes it particularly suitable for use in a broad range application fields, such as the white light calibration in optical systems.
Owing to the structure of the material reflectivity in the order of more than 98% can be achieved.
FTL Seals Technology is able to offer standard circular and square platen sizes of 10mm thickness for use as reflectance standards.
Calibration curves are available if required.
For standard applications the reflecting surface on the inside of a sphere photometer is often barium sulphate, which has certain disadvantages.
Porous PTFE exhibits the ability handle a larger range of UV and NIR wavelengths, improved ageing behaviour and higher mechanical stability.
It is possible to either manufacture hollow spheres from porous PTFE or to recoat exiting spheres.
Laser display technology demands display screens of the highest optical quality.
EKPT porous PTFE material meets these stringent demands with vision range of approximately 2-pi.
The so called Speckle effect is also dramatically reduced.
A potential problem occurs with large screens in that they are unable to carry their own weight.
A laminated material has been developed that is able to support both the weight of the surface and of the carrier material itself.
Curved screens, such as used in planetaria, can be made with such a material.
Development work is also currently underway on back projection systems of only a few millimetres thickness.
Porous PTFE has air and gas flow rates fro 1 to 1000ml/scm.
However it has a water hold back value of up to 1.2bar without compromising the gas flow rate.
This makes porous PTFE suitable for applications such as filters, membranes and diaphragms.
Porous PTFE material is available in dimensions to suit specific applications, ranging from solid blocks to sheet foils.
Like nonporous PTFE material it is normally supplied in semi finished form for the client to finish to the required dimensions.
However we are able to supply fully finished articles if that is what is required A full technical advice service is available from FTL Seals Technology, on request.
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Contact FTL Seals Technology
Tel +44 113 252 1061
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