Clear smooth UV protective acrylic, indistinguishable from glass in a frame. Provides the highest protection against damaging UV light. Used by museums around the world. ACRYLITE® UV filtering (OP3) is a continuously manufactured UV resistant acrylic sheet with built-in protection rather than a coated surface. Lightweight, durable and clean when you buy it. .098 inch thick (approximately 1/8″ thick).