What is the most common alloy used in making eyeglass frames, composed of 63-70% nickel?

Monel is indeed the most common alloy used in the production of eyeglass frames, primarily composed of 63-70% nickel. This alloy is favored in the eyewear industry due to its excellent corrosion resistance and strength, making it particularly suitable for items that experience daily wear and exposure to environmental elements. The high nickel content gives Monel enhanced durability, which is important for frames that need to withstand the rigors of regular use while remaining lightweight and comfortable for wearers.

Monel also has the advantage of being easily adjustable, ensuring that the frames can be molded to fit different face shapes and sizes comfortably. This flexibility is essential for opticians when fitting glasses to individual clients.

In contrast, the other options, while they have their own applications, do not match Monel in terms of common usage for eyeglass frames specifically. Titanium, for instance, is known for being lightweight and hypoallergenic but is less commonly used due to its higher cost. Stainless steel offers strength and durability but may not possess the same level of adjustability and aesthetic appeal that Monel provides. Aluminum is recognized for being lightweight but lacks the robustness needed in eyeglasses, particularly in maintaining shape over time.