Tensile Strength

Hoya Vision Care's Phoenix lens, made from Trivex lens material from PPG Industries, withstood up to 65 kg of force during this tensile strength test performed at the Hoya booth during Vision Expo.  For each test, a standard rimless screw was inserted through the two drill holes on opposite ends of the lens.  Collets attached to the screws pulled them in opposite directions until either the lens or the screw failed.  In some cases, the screw even broke before the Phoenix lens.  In contrast, standard CR 39 lenses all failed when 10 to 20 kg of force were applied.  The test demonstrates the durability of the Phoenix lens, which makes it ideally suited for rimless and three-piece frames in which the lens is an integral part of the design.