Heat is one of the major causes of crazing. Plexiglass is produced as a flat sheet, then shaped with heat. When it gets hot again, it tries to return to its original flat shape. This stress on the curved areas of the windshield causes distortion of the plexiglass which is commonly known as crazing. Crazing is very often first discovered on the curved portion of the windshield.
Heat is produced when the sun's rays are absorbed.
Plexiglass is transparent and does not absorb the sun's rays very well. But when they are absorbed by the interior of the aircraft, heat is produced. As the cockpit temperatures rise, so does the temperature of the plexiglass. The cockpit stays cool and windows stay cooler. Kennon uses the very best materials that are made to withstand the sun.