CR-39 refers back to the product that is accustomed to make The bulk prescription lenses. It truly is an optical grade plastic polymer recognised for its mild excess weight, chemical resistance Qualities and ‘tint-skill’. In equivalent prescriptions it really is close to half the load of glass lenses, when being slightly thicker. Its influence resistance is bigger than glass but doesn’t rise to the level of polycarbonate and it really should not be regarded for applications where by impacts are commonplace. On this basis, It’s not advised for Energetic athletics and motorcycling. It is much more scratch resistant than polycarbonate, but will scratch Otherwise correctly looked after.
Polycarbonate is undoubtedly an affect resistant substance. It is now applied additional commonly in the latest situations – specifically for motorcycling and motion acrylic tubing sports activities. It is also employed frequently for the glazing of rimless frames as a consequence of these properties. While polycarbonate is effect resistant, it should not be deemed indestructible. Polycarbonate is definitely the strongest materials obtainable and can have the tendency to break into more substantial items, as opposed to the CR39’s smaller sized parts, and is also, As a result, fewer dangerous. Polycarbonate is thinner than typical CR39.
Polycarbonate lenses are 10 moments additional affect resistant than other plastics earning them really well suited for action sports or folk that are somewhat (shall we say) heavy-handed! They provide UV defense and end ninety nine.9% of rays from your Sunlight, fluorescent lights and Laptop screens. Our polycarbonate lenses are equipped using a scratch resistant coating and so are thinner than regular lens and as a consequence more cozy to have on.