Front surface mirror

Surface mirrors, or also called front surface mirrors, are effective and inexpensive glasses when it comes to reflecting or redirecting radiation, especially in the visible range, due to aluminum as the reflective material.
The aluminum is coated with dielectric layers that protect it and specifically enhance the reflection in the glass. The reflection from the front of the glass mirror occurs without light passing through the glass. In this way, front surface mirrors avoid the formation of double images and are used in mechanical and apparatus engineering, for inspection technology and also by photographers.

Substrate: Float glass, clear & low iron glass
Available thicknesses: 1mm, 2mm, 3mm, 4mm, 5mm and 6mm

Information & specification


Single-side coating: Aluminium with an interference coating for reflectivity enhancement, deposited by magnetron sputtering under a high vacuum.

Surface protection

Following the visual inspections, the coated side of the front surface mirror is provided with a thin, easy-peel protective film to prevent damage during transport, removable without leaving any residue.

Optical requirements

Minimum reflective values at defined wavelenghts under differnt light incidence angles (directed reflection):

    Wavelength in mm     6° light incidence angle     45° light incidence angle
                 400                  ˃ 92%                  ˃ 92%
                 450                  ˃ 93%                  ˃ 93%
                 550                  ˃ 94%                  ˃ 94%
                 600                  ˃ 90%                  ˃ 90%

Front surface mirrors are optically opaque, meaning they have no measurable transmission.

Durability requirements

  • Abrasion test, 200 strokes, 566 g, with cheesecloth
  • Adhesion test with tape, Scotch 3M 8981
  • Humidity test, 48 h, 95% relative humidity, 50°C
  • Immersion test in salt solution, 37 g/l, 24 h at room temperature
  • Salt spray test to ISO 9227 NSS, 48 h
  • Wipe test (20 cycles) with isopropyl alcohol, acentone, 2h at room temperature
  • Cycling test (4h at 80°C, 4h at -30°C, 16h at humidity to ISO 6270 Part 1), 4 cycles
  • High-temperature storage (7 days at 100°C)

Following these tests, the coating must not show any defects such as stains, delaminations or pinholes. The required minimum reflectance values must also be exceeded after these tests.

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