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What are spectacle frames made of, and which material suits me?

Two frames of the same shape and size can feel completely different on the face, because of what they are made of. Material decides the weight, how well the frame can be adjusted to fit you, how your skin reacts to it, and how it stands up to sweat, salt air and the monsoon. Fit, rim types and the basics are covered on our spectacle frames page; this guide goes material by material.

How heavy is each material?

Weight depends on density, that is, how heavy a material is for its size. For the same-sized piece, approximate figures are: TR90 nylon about 1.0 g/cm³ (close to water), acetate 1.3, aluminium 2.7, titanium 4.5, stainless steel 7.9 and monel 8.8. Metal frames are made thinner than plastic ones, so the finished frame can still be light, and with a strong power the lenses usually weigh more than the frame.

Plastics

Cellulose acetate

A plastic made from cellulose (the fibre in cotton and wood pulp) mixed with a softener. Good acetate frames are cut from layered blocks or sheets, which is how they get their deep colours and tortoiseshell patterns, then shaped and polished by hand. Acetate replaced celluloid, an older and highly flammable plastic, as the main material for plastic frames in the twentieth century. Some of the sheet comes from Italian makers such as Mazzucchelli, founded in 1849.

• Advantages: rich colour and pattern, a solid feel, and it softens with gentle heat so the arms and bridge can be adjusted.
• Disadvantages: heavier than TR90; a moulded bridge may slide on a low nose; over years, sweat, skin oils and heat can dull, whiten or crack lower-grade acetate, and a frame left on a hot car dashboard can warp.
• Good for: people who want colour or a bold shape, and high minus powers, because a thick rim hides a thick lens edge.
• Think twice if: you have a very low, flat nose bridge and the frame has no nose pads or low-bridge design.
• For your lenses: the deep rim groove holds lenses firmly and hides much of a thick edge.

Bio-acetate

Acetate made with a plant-based softener in place of the usual petroleum-based one. Makers say it uses less fossil raw material; how it breaks down depends on conditions, so ask what a green label actually means. It was widely shown at the 2026 eyewear fairs; see eyewear trends 2026.

• Advantages: looks, feels and adjusts like ordinary acetate, and more of its raw material comes from plants, because the softener is plant-based as well as the cellulose.
• Disadvantages: needs the same care as acetate, and green claims vary from label to label.
• Good for: anyone who likes acetate and cares about materials.
• Think twice if: a label promises more than it explains; ask what the material actually is.

Injection-moulded plastic and propionate

Liquid plastic forced into a mould, much like a toy, with the colour often sprayed on afterwards. It is a factory method, credited to no single designer. Cellulose propionate is a lighter injected plastic used by some large brands for everyday frames.

• Advantages: light, any shape is possible, and quick to make in large numbers.
• Disadvantages: can feel less solid, allows little adjustment, and sprayed colour can chip; some plastics turn brittle after long sun exposure.
• Good for: a spare pair, plain sunglasses, occasional wear.
• Think twice if: you need a precise, adjustable fit, as with progressive lenses or a strong power.

TR90 (Grilamid nylon)

A thermoplastic polyamide (a type of nylon) developed in Switzerland and sold under the trade name Grilamid TR 90. It bends a long way and springs back.

• Advantages: very light, very hard to break, and resists sweat; often chosen for children and sport.
• Disadvantages: hard to adjust, because it tends to spring back to its moulded shape after heating; the finish can look plain.
• Good for: children, active people, anyone who is rough on spectacles, and people who want a light everyday frame.
• Think twice if: you need fine adjustment of the bridge or arms; a TR90 frame must fit well from the start.
• For your lenses: for children, pair it with impact-resistant polycarbonate lenses.

Metals

Monel and nickel alloys

Monel is a nickel-copper alloy patented in the early 1900s and named after Ambrose Monell of the International Nickel Company. Monel and similar nickel alloys are the base of many everyday metal frames, which are then plated with colour.

• Advantages: easy to shape and solder, so they come in many designs and are easy to repair.
• Disadvantages: plating wears off where the frame touches skin; nickel is one of the commonest causes of contact skin allergy, with itching, redness or dark marks on the nose or behind the ears; they corrode faster in sweat and salt air.
• Good for: people with no metal allergy who want a slim metal look.
• Think twice if: earrings, watch straps or belt buckles give you a rash, you sweat heavily, or you work outdoors near the sea.

Stainless steel

Steel with chromium added, which forms a thin protective layer against rust. Harry Brearley of Sheffield is usually credited with inventing it in 1913.

• Advantages: strong even when very thin, so flat, slim designs are possible; good corrosion resistance; some grades contain little or no nickel.
• Disadvantages: heavier than titanium, and not every grade suits sensitive skin.
• Good for: slim office frames, and people who want strength without bulk.
• Think twice if: you have a strong nickel allergy; ask which grade the frame uses.

Titanium and beta-titanium

A light, strong metal also used in aircraft. Japanese frame makers, especially in the town of Sabae, are widely credited with turning it into a spectacle-frame material in the early 1980s. Beta-titanium is a titanium alloy that is more flexible, which suits springy arms.

• Advantages: light, strong, does not rust, holds its adjustment, and pure titanium contains no nickel.
• Disadvantages: costs more to make, and a broken titanium frame is hard to repair locally because it needs special welding; some frames are titanium only in parts. Look for stamps such as Titanium, Ti-P or β-Ti, and see how to check genuine branded frames.
• Good for: nickel allergy, heavy sweating, life near the sea, and older wearers who want a frame they barely feel.
• Think twice if: you have a strong nickel allergy and the hinges or nose-pad arms are a different metal; ask.
• For your lenses: thin titanium rims show the lens edge, so with a moderate or high power a thinner lens may help; your eye doctor or optometrist advises after the eye test.

Memory metal (nickel-titanium)

An alloy that returns to its shape after being bent. It was developed at a US Navy laboratory in the early 1960s and named Nitinol.

• Advantages: survives being sat on, twisted or grabbed by a toddler.
• Disadvantages: contains nickel, comes in fewer styles, and its springiness makes fine adjustment difficult.
• Good for: people who are hard on their spectacles.
• Think twice if: you are allergic to nickel.

Aluminium

A light metal, often anodised in clean, modern colours; a niche choice in eyewear, credited to no single designer.

• Advantages: light and distinctive.
• Disadvantages: hard to adjust or solder, can dent and scratch, and salt and sweat can mark the surface.
• Good for: people who want a light, modern metal look and handle frames gently.
• Think twice if: you need precise adjustment or work in a salty, sweaty setting.

Wood and horn

Thin layers of wood, or buffalo horn, shaped largely by hand, so each frame looks a little different. Horn is one of the oldest frame materials, which is where the phrase "horn-rimmed" comes from.

• Advantages: natural, warm to the touch, and individual; wood is light.
• Disadvantages: sensitive to water and humidity, which can make them swell, crack or warp; limited adjustment and repair.
• Good for: an occasional or special-occasion pair.
• Think twice if: it would be your only pair through a Goan monsoon, or the wearer is a child.

Frame materials and Goa's climate

Salt and sweat attack metal first. Hinge screws and nose-pad arms, often made of nickel alloys, corrode before the rest of the frame, and plating wears through where skin touches it. Titanium and good stainless steel resist this, plastics such as TR90 and acetate cannot rust, and lower-grade acetate dulls sooner in heat and humidity. For day-to-day care, see our page on spectacle care in humid weather.

Which material for which person?

• Nickel allergy: titanium (all parts), acetate, TR90, or a suitable stainless steel; avoid monel, nickel alloys and memory metal.
• Heavy sweating or outdoor work near the sea: titanium, TR90 or acetate.
• Children: TR90 or soft acetate with spring hinges. See spectacles for children.
• High power: a sturdy full-rim frame, often acetate, that holds a thick lens securely; see stylish frames for high power.
• Progressive lenses: a material that can be adjusted precisely, such as acetate or metal with nose pads, because the fitting height must stay where it was measured.
• Lightest possible frame: titanium or TR90.

Material is one part of a good pair. After your eye test, the frame is chosen around your prescription, your measurements, your skin and your daily routine, then adjusted to sit correctly once the lenses are fitted. That fitting work, more than the label, decides how comfortable your spectacles feel.

If you need spectacles, the Vision Correction Centre at ReNew Vision Eye Hospital, Vasco, provides vision correction: an eye test, lenses made to your prescription, and help choosing a frame that suits your lenses and your face.

Questions patients ask

Which frame material is the lightest?

TR90 nylon is the lightest common material, with acetate close behind among plastics and titanium the lightest of the usual metals. Because metal frames are made thinner, a titanium frame can feel lighter than a plastic one. With a strong power, the lenses often weigh more than the frame.

Why has my acetate frame turned white or cloudy?

Over years, sweat, skin oils and heat slowly attack the surface of acetate, and lower-grade acetate shows it sooner. Light dullness can sometimes be polished, but a frame that is cracking near the hinges or bridge should be replaced before it breaks.

Can a broken titanium or TR90 frame be repaired?

Often not easily. Titanium needs special welding, and TR90 does not glue or solder well. Screws, nose pads and sometimes hinges can be replaced on most frames, so have a damaged frame checked by an optician before you give up on it.

Are wooden frames suitable for the Goan monsoon?

They can be worn, but humidity and rain can make wood swell, crack or warp, even with a sealed finish. Wood suits an occasional or second pair better than the only pair you wear every day through the monsoon.

Which frames are safe if I am allergic to nickel?

Titanium (with every part titanium), acetate, TR90 and some grades of stainless steel are the usual choices. Avoid monel, nickel alloys and memory metal. If a rash keeps coming back where your frame touches, see a skin doctor.

Brand and model names on this page are trademarks of their owners and are used only to explain eyewear. ReNew Vision Eye Hospital is not connected with these brands.

This page is general eye-health information, not personal medical advice. Your eye doctor advises you after examining your eyes.