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Spy Mirrors

"One-Way-Mirror" coatings on glass substrates

TDS Series

Special Properties

  • Subjective transparency depends on lighting conditions
  • Reflectance approx. 60%
  • Transmittance approx. 3-4%
  • RoHS compliant
  • Good moisture resistance
  • Condensation-resistant

Typical Applications

  • Spy-Mirror
  • "One-way mirror"
  • Mirror attachment for security video camera systems
  • Hidden observation windows
  • Mirror for environments with high humidity
  • Animal observation

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A so-called spy mirror allows observing a bright room from a dark room. At the same time, it is impossible to view from the lit room into the dark room. In the bright room, only a mirror reflection is seen, so the observer can't be discovered. Due to this effect, such a spy mirror is also called a one-way mirror. This one-way effect, however, is solely based on the light contrast between the two sides of the mirror because a mirror that is transparent only from one side is not possible for physical reasons. So it is imperative for the desired function of a spy mirror that the lighting conditions between the region to be observed and the area from which it is observed differ significantly. The space to be viewed should be illuminated as light as possible while the observer room remains as dark as possible for best results.

Our TDS spy mirror can also be used to hide surveillance video camera equipment, which works based on the same principle of different lighting conditions in front of and behind the mirror as described before. The camera, however, should be sensitive enough to deliver a picture bright enough.

The TDS mirrors have a chrome coating with only a small transmittance. It is corrosion resistant, highly resistant to water, acids, and other environmental influences and it is RoHS compliant. The coated side of the spy mirror should point towards the bright room.

At adequate quantities, a thermal hardening of the spy mirror is possible as it is often required for safety-relevant areas. Also available at large purchase quantities are other optical rest-transmissions and further glass thicknesses. Please send us your requirements in such cases.


To request a quote our TDS spy mirror with individual dimensions, please click the button below:


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Optical properties

  • Average transmittance in the visible ca. 3-4%
  • Reflectance approximately 60%

Product code

  • TDS Spy Mirror



  • Single side chrome mirror coating (RoHS compliant)

Standard Thickness


All given details and specifications are mean reference values and are not guaranteed. Also, please consider our "Notes on technical specifications".

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