Eyeglass Frames: It's a Material World By Erinn Morgan, with updates by Gina White

What are you looking for in eyeglass frames? A wide range of available colors? Durability? Lightness on your face? Hypoallergenic materials? A good price? Uniqueness?

Finding eyeglasses with the qualities that are most important to you is as simple as choosing a frame material: each one comes with its own unique set of strengths that makes it distinct.

Plastic
If you want the colors of the rainbow, then zyl (zylonite, or cellulose acetate) is your material. Zyl is a very cost-effective and creative option for eyewear and is extremely lightweight. Particularly popular right now are laminated zyl frames that have layered colors.

Some manufacturers are also using propionate — a nylon-based plastic that is hypoallergenic. It's lightweight and has a different look and feel than other plastics.

This sunglass is mostly nylon, with stainless steel hinges for extra strength. Vestra, by Lazi.Eyeglasses made of nylon were first introduced in the late 1940s. Because of brittleness and other problems, eyeglass manufacturers switched to blended nylon (polyamides, co-polyamides and gliamides). Today's blended nylon frames are both strong and lightweight.

Nylon is also a premier material for sports and performance frames — typically made of gliamides, which are very resistant to hot and cold and are more flexible, yet also stiff. Nylon is also easily molded into today's popular wraparound styles, as well as other shapes that are difficult to produce.

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 slightly decrease their strength but do not affect color.

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Titanium used to come only in silver-gray, but now many colors are available. This is an Everlast frame.Metal
Monel — a mixture of any of a broad range of metals — is the most widely used material in the manufacture of eyeglass frames. It is malleable and corrosion-resistant — especially if the right kind of plating, such as palladium or other nickel-free options, is used.

Frame manufacturers are coming out with more and more titanium styles these days; titanium is a silver-gray metal that's lightweight, durable, strong and corrosion-resistant. It has been used for everything from the Gemini and Apollo space capsules to medical implants such as heart valves. Titanium eyewear can be produced in a variety of colors for a clean, modern look with a hint of color.

Not all titanium frames are 100 percent titanium. Some are made from an alloy that is a combination of titanium and other metals, such as nickel or copper. In general, titanium alloy frames cost less than 100 percent titanium frames.

The figure-8 frame on these Lazi sunglasses is made of beryllium.Beryllium, a steel-gray metal, is experiencing increased popularity as a lower-cost alternative to titanium eyewear. It resists corrosion and tarnish, making it an excellent choice for wearers who have high skin acidity or spend a good amount of time in or around salt water. It's also lightweight, very strong, very flexible (making it easy for an optician to adjust your glasses) and available in a wide range of colors.

Stainless steel frames are another alternative to titanium. Qualities of stainless steel frames include light weight, low toxicity and strength; many stainless steel frames are also nickel-free and thus hypoallergenic. Stainless steel is readily available and reasonably priced. It's an alloy of steel and chromium; it may also contain another element. Most stainless steels contain anywhere from 10 to 30 percent chromium, which imparts an excellent resistance to corrosion, abrasion and heat.

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Relatively new to the eyewear market, Ticral is an alloy of titanium, copper and chrome. It is nickel-free and thus hypoallergenic. It's also extremely lightweight and offers many of the features of titanium without the high cost. It can be cut a bit thicker than titanium, which enables it to have the popular look of a thin plastic frame while still offering light weight. The material is also strong, durable and available in a variety of colors.

Kevin James of The King of Queens is wearing Flexon Select style 1117 in bronze.Flexon is a titanium-based alloy. This unique and popular material, which is proprietary to the eyeglass manufacturer Marchon, is called a "memory metal" because it can go back to its original shape if damaged. Frames made of Flexon come back into shape even after twisting, bending and crushing. Flexon frames are lightweight, hypoallergenic and corrosion-resistant.

"Since Flexon easily goes back into the shape the dispenser originally gave it, it ultimately makes for a better frame and fit," said Dave Chure, executive vice president of Marchon. "Flexon is also about 25 percent lighter in weight than standard metals so you get much less weight on the face."

Frames made from aluminum are lightweight and highly corrosion-resistant. Aluminum is used primarily by high-end eyewear designers because of the unique look it creates. Aluminum is not only the world's most abundant, but also the most widely used, nonferrous material. Pure aluminum is actually soft and weak, but commercial aluminum with small amounts of silicon and iron is hard and strong.