Does lexan yellow with age

Answer 1

Lexan is a name brand of polycarbonate plastic. Sort of like Xerox has come to mean making a copy on a photocopier. Polycarbonate will lose many beneficial characteristics if left in sunlight extensively. It has a blue tint that would tend to cancel some yellowing effects of sunlight but will turn yellow if left in sunlight over a long period of time. Other types of plastics turn yellow in sunlight as well. No sunlight, no yellow. It also becomes brittle and generally weaker over time when exposed to sunlight. This type of plastic has been used in bullet proofing cars. However, over a period of time in sunlight, the plastic must be replaced if it is to continue stopping bullets. I saw a .44 magnum cal. bullet imbedded in a 1 inch thick piece of poly-carbonate years ago. The inside surface had a slight dimple. Polycarbonate does not fracture or crack if in good condition (no sunlight).