Eyeglass Frame Materials Compared: A Six-Material Guide for Optical Retailers And Wholesalers

A customer rarely asks for a frame material by name. They say the glasses must be light, must not break, must not irritate, or must look a certain way. The retailer's job is to translate those wishes into a material and a model, and the wholesaler's job is to supply a range that makes that possible.

This guide compares six materials side by side: sheet acetate, TR90, Ultem, stainless steel and similar metals, and titanium, with a note on nickel-titanium "memory" alloys. It is an overview. If you want a deep comparison of two or three of them, use a dedicated guide. Here the aim is to give staff and buyers a single reference for choosing and recommending.

The Materials at a Glance

 These are general descriptions. Within each material, quality varies by grade, design and factory, so use the table as a starting point and check actual samples.

Acetate

Acetate is the classic plastic for fashion frames. Because the frame is milled from a sheet, makers can use solid colors, layered sheets and patterns, and can make a frame quite thick. It can be adjusted by warming it, which is useful in the store, although a frame that has been heated too much or left in a hot place can lose its shape.

Acetate is often heavier than TR90 or titanium, and weight depends on the design and thickness. It is not an automatic choice for a customer who wants the lightest frame. It should also not be described as "hypoallergenic" or "safe for all skin". Reviews of frame allergens list plastics and their additives among the possible triggers, so a better line is that acetate suits many wearers but that anyone with a persistent reaction should see a doctor.

What to tell customers: "This gives you the most color and style choice. It has a bit more weight, and we can adjust it with gentle heat. Keep it away from hot places."

TR90

TR90 is a nylon-based plastic that is injection molded. Frames are light and flexible, which makes them popular for sports, children and anyone who wants a frame that gives a little. Because it is molded, a new shape needs a mold, which affects lead time and cost.

There are limits that buyers should know. TR90 is difficult to adjust compared with acetate and metal, so it suits frames that fit well off the shelf. It can be flexible but usually breaks when overstressed rather than bending back, it can be brittle in cold conditions, and stress can build around the hinge screws. The name TR90 is also used loosely in the trade, so ask the supplier what the material actually is and request a specification.

What to tell customers: "This is a light, flexible frame that is good for daily wear and active use. It does not adjust as easily as metal, so we choose the size carefully."

Ultem

Ultem is a high-performance plastic that is also injection molded. It has high heat resistance and can be used to make thin, strong frames. In data sheets it has a higher density than TR90, so it is not automatically lighter. A finished frame's weight depends on its design and thickness, so compare real samples rather than assuming.

Ultem frames are less common than TR90 and acetate, so supplier experience matters. Ask which grade is used, what finish is applied, and how the frame behaves when adjusted.

What to tell customers: "This is a slim, strong plastic frame with a modern look. Let's try it on to feel the weight."

Stainless Steel and Other Metals

Metal frames are made from wire and strip that are formed, joined, polished and finished. They are slim, have many shape options and are easy for staff to adjust. They are common for rimless and semi-rimless styles, though how well a rimless mount works depends on the lens material and power, which the optician decides.

The material list is wide. Stainless steel is common, and other metal alloys are used in budget frames. Some contain more nickel than others, and finishes can wear at the nose and behind the ears. Fine rims and pad arms can bend out of shape when handled roughly, and solder points are common fault sites. Ask what the base metal is, how it is finished and what test documents exist.

What to tell customers: "This is a slim, adjustable frame. We can fine-tune the fit for you. Keep it in a case and use two hands to take it off."

Titanium

Titanium frames are valued for being light for their strength and for resisting corrosion. Pure titanium, beta titanium and titanium alloys are used, and they behave differently. Some are springy, and some hold an adjustment better than others. Titanium is not unbreakable or unbendable, and a titanium frame can still go out of shape or fail at a joint.

Titanium itself is generally nickel-free, but a finished frame has other parts, such as screws, solder, coatings and pad arms. Titanium and its alloys have also been reported as allergens in some people, so avoid absolute claims. Surface treatments can give titanium a range of colors, so "limited colors" is not a fair rule.

Nickel-titanium "memory" alloys are a separate case. They spring back after flexing and are used for parts like temples or bridges, but they contain nickel and accept only limited reshaping.

What to tell customers: "This is a light, strong frame that resists corrosion. It costs more, and the way it adjusts depends on the alloy."

Myths to Correct

• "This material is hypoallergenic." Allergy depends on the specific material, additives, finish and the person. No frame material is safe for everyone, and a customer with a persistent reaction should see a doctor.

• "Titanium cannot be bent." Frames can bend, deform or fail at joints. Choose it for weight and corrosion resistance, not for being unbreakable.

• "This frame material suits high prescriptions because it keeps lenses thin." Lens thickness depends on the prescription, lens material and index, and lens size and position. A frame material does not make a lens thinner. A frame material can change the weight of the frame.

• "Thin always means light." Weight depends on design, thickness and size, and a thick light plastic can weigh less than a thin heavy metal.

• "The lightest frame is the most comfortable." Strong lenses can be heavy, and comfort also depends on fit and nose pad position.

Recommending a Material by Customer Need

Use the customer's description rather than a rule. The table gives starting points.

Notice that for strong prescriptions the first step is lens and frame size, not material. This keeps staff honest about what each material can and cannot do.

Adjustment and After-Sales by Material

Where a frame has cracked at a joint or a finish has failed early, adjusting again will not solve it. Record it and use the defect terms agreed with your supplier.

Stocking a Multi-Material Range

There is no fixed split that suits every store. A practical approach is:

• Start from your own data. Review your sales and returns by material over several seasons.

• Core models. Keep a few reliable core models in each material your customers buy, in a spread of sizes.

• Test models. Add a small number of new models in a material you do not yet carry to see how customers respond.

• Track results. Record returns and complaints by material and cause, and adjust the range.

• Train staff. Staff who can explain materials simply sell with more confidence and reduce returns from mismatched expectations.

What to Ask Suppliers, Material by Material

• Acetate: sheet source and thickness, hinge fixing method, polishing and finish, and care instructions.

• TR90: the actual material specification, hinge design and screw seat, and how the frame handles low temperatures.

• Ultem: grade, finish and adjustment advice.

• Metal: base metal, plating or coating, solder method, nose pad and screw materials, and available test reports.

• Titanium: the alloy type, the material of other parts and any coating, and adjustment limits.

• All materials: dimension sheets, sample approval, batch consistency and defect terms in writing.

Where IU Eyewear Fits

IU Eyewear is based in Danyang. According to its website, it works with materials including acetate, metal, TR90, titanium, alloy and Ultem, and its custom process runs from the project brief through design review, material selection, tooling and samples, sample approval, mass production, inspection and packing.

When you plan a multi-material range, ask any supplier, including IU Eyewear, the questions above for each material, and get the answers in writing before you place an order.

To see the range and what we supply, visit our homepage for wholesale glasses frames.

For product details and specifications, download our wholesale glasses frames catalog.

If you have questions about your order or want to discuss samples, contact IU Eyewear.