Acetate/Plastic is a very cost-effective and creative option for eyewear and is extremely lightweight. If you want the colors of the rainbow and the must up to date eyeglasses trends, then this is your material. Plastic frames do have some drawbacks. They are easier to break than metal frames, they will burn (but are not easily ignited), and aging and exposure to sunlight decrease their strength slightly. Color can fade over time, but not as much with modern materials.
Metal - a mixture of any of a broad range of metals - is the most widely used material in the manufacture of eyeglasses frames. Its malleability and corrosion resistance are pluses.Still, it is not 100 percent corrosion-resistant: for some people, metal can react with their skin chemistry. But this is preventable if the right kind of plating, such as palladium or other nickel-free options is used.
Titanium is a silver-gray metal that's lightweight, durable, strong and corrosion-resistant. Titanium eyewear can be produced in a variety of colors for a clean, modern look with a hint of color. And they're hypoallergenic.
Stainless steel frames are another alternative to titanium. Qualities of stainless steel frames include light weight, low toxicity and strength; many stainless steel frames also are nickel-free and thus hypoallergenic.Most stainless steels contain anywhere from 10 to 30 percent chromium, which provides excellent resistance to corrosion, abrasion and heat.
Flex is a titanium-based alloy called "memory metal": frames made of Flex come back into shape even after twisting, bending and crushing. Flex frames are lightweight, hypoallergenic and corrosion-resistant they are about 25 percent lighter in weight than standard metals, giving you a much lighter feel on your face.