All Opticast mirrors now come with a protective silicone monoxide overcoat. Use the following cleaning proceedures to keep the mirror in good condition.

Opticast mirrors are not recommended for extreme temperature service. Below zero degrees Fahrenheit the image quality may temporarily degrade due to the unequal thermal expansion coefficients of the substrate and the surface layers. Continuous service at temperatures above one hundred ten degrees Fahrenheit may cause permanent distortion of the figure by half a wave.

Continuous service at humidities above 70% may cause temporary "orange peel" surface irregularities which can be reversed by storing the mirror in a dessicated container.

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