The Label On Each Pair Of Eyeglasses Can Tell What It Is Made Of
When making the cheapest eyeglasses lenses, PA, nylon, and resin materials can enhance toughness, tensile strength, impact strength, scratch resistance, flame retardancy, high temperature resistance, and other properties; Scratch resistance, high temperature resistance, and other properties can also be added to glass materials!   Now that you understand, take action to get a new pair...
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