Eyeglass frames are made out of many different composite materials and formulas, but the basic groupings are metal and plastic. In plastics, zyl is the most common although lower quality plastics are used in the cheaper frames. Nylon is often used in sport sunglasses due to its impact resistance and flexibility. Among the metals, monel is most common, followed by titanium, stainless steel, nickel silver, alpaca, and aluminum. Zyl Zyl is a short name for the material cellulose acetate, which […]

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