OPTICAST MIRROR SPECIFICATIONS


OPTICAST mirrors consist of cast gypsum cement substrate covered with several very thin layers of hard high temperature thermosetting plastic. Heat treatment of the plastic between the casting of successive layers ensures the long term stability and high accuracy of the finished surface.


Diffraction pattern This diffraction pattern from an eight year old OPTICAST mirror shows the excellent figure and long term stability of these mirrors.


TYPICAL CHARACTERISTICS OF OPTICAST MIRRORS
Surface Accuracy 1/4 wave, peak to valley, 6328 Å
Reflectivity90%
Thermal coefficient of expansion 16x10E-6 per ºC
Thermal conductivity 2x10E-5 cal•cm/cm²secº C (Hydrostone)
Average surface roughness Less than 25Å
Total scattered light .0025 per steradian
Substrate density From 1.3 g/cm³ to 2.4 g/cm³


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