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.
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| This diffraction pattern from an eight year old OPTICAST mirror shows the excellent figure and long term stability of these mirrors. |
| Surface Accuracy | 1/4 wave, peak to valley, 6328 Å |
| Reflectivity | 90% |
| 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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