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Views: 100 Author: Matt Publish Time: 2026-07-30 Origin: Site
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Wholesalers and retailers keep hearing the same question from customers and from their own buyers: TR90 or Ultem? Both are described as lightweight plastic frame materials, both appear on many product pages, and both are used in everyday optical frames. Yet they are different materials with different behavior, and the labels are not always as clear as they look.
This guide compares them from a buyer's point of view. It answers the question many people search for, which is lighter, with published data, then looks at flexibility, heat, adjustment, labeling, customers and regions. We avoid price claims, because cost depends on the specific frame and supplier, and we avoid declaring a winner, because the right choice depends on your market.
Three things drive the question:
• Similar claims. Both materials are marketed as lightweight, so buyers cannot tell them apart from a product page.
• Unclear differences. Listings often say Ultem or TR90 without saying what that means for feel, durability or price.
• Choosing for a market. Buyers want to know which material to stock for their customers and their climate.
A clear answer builds trust with both retail customers and the buyers you supply.
TR90 is a nylon-based material, often sold under the trade name Grilamid TR 90 by the Swiss company EMS-Grivory. It is injection molded into frame parts and is known for being light and flexible.
Ultem is a trade name of the materials company SABIC for polyetherimide, often shortened to PEI. It is a high-performance engineering plastic that is also injection molded and is known for being stiff and heat resistant.
Point | TR90 | Ultem |
Material type | Nylon-based (transparent polyamide) | Polyetherimide (PEI) |
Typical behavior | Flexible, springs back after bending | Generally stiffer, less flexible |
Density (resin datasheet) | About 1.0 g/cm³ | About 1.27 g/cm³ (Ultem 1000) |
Glass transition temperature | About 155 °C | About 217 °C |
Common uses in eyewear | Everyday, sports and children's frames | Slim everyday frames, often marketed as premium |
The density and temperature values come from manufacturer or distributor datasheets for the base resins, Grilamid TR 90 and Ultem 1000. Frame makers may use different grades or blends, so treat them as a guide to the materials, not as the specification of a given frame.
Many buyers assume Ultem is the lighter material because it is often marketed as ultra-light. The datasheets point the other way. Grilamid TR 90 has a density of about 1.0 g/cm³, while Ultem 1000 resin is about 1.27 g/cm³. Per unit of volume, TR90 is not heavier than Ultem, and is lighter.
That does not settle the question for a finished frame, because the weight of a frame depends on its design as well as its material. Ultem is stiffer, and a stiffer material may allow thinner sections, which could reduce the amount of material used. Whether that offsets the higher density depends on the specific frame. The practical answer is:
• In principle: Material density favors TR90, while design and thickness can change the result.
• In sourcing: Ask suppliers for the measured weight of the exact frame, with lens size and size markings, and compare frames of similar size.
• In selling: Avoid telling customers that one material is lighter without checking the actual frames.
TR90 is known for flexibility. It can bend under pressure and tends to return toward its shape, which is why it is popular for sports, children's and everyday frames. Its limits are also worth knowing. It can become more brittle in cold conditions, high-stress points around hinge screws can crack under heavy use, and when a frame does fail it usually breaks rather than bends.
Ultem is generally described as stiffer and less flexible than nylon materials, including TR90. The datasheet for Ultem 1000 lists a flexural modulus of around 3,300 MPa, while the TR 90 datasheet gives a tensile modulus of 1,600 MPa. These are different properties, so the numbers cannot be compared directly, but together with other published descriptions they support the general picture that Ultem is the stiffer material.
Stiffer does not mean unbreakable and flexible does not mean weak. The better question is how a frame fails in your customers' real use: bending in a bag, being sat on, hot cars, or years of careful office wear.
Datasheets list a glass transition temperature of about 155 °C for Grilamid TR 90 and about 217 °C for Ultem 1000. Both are far above the temperatures glasses meet in normal wear, including hot weather, so for most customers the difference is not a daily concern. It matters more in manufacturing and in extreme conditions.
Adjustment is a separate issue. Standard TR90 frames are generally described as difficult to reshape because the material tends to return to its molded shape. Opticians in trade discussions also report that grades and constructions differ, with some frames including a metal core in the temples that allows adjustment, and some fronts reacting badly to direct heat. Because behavior varies, do not promise shop adjustment for either material until you have tested the exact frame.
TR90 and Ultem are both widely used names, and neither guarantees what is in a given frame. Points to check:
• Grade. Different grades of a material can behave differently, and the term TR90 is used loosely in the trade.
• Mixed constructions. Opticians have noted that some frames sold as Ultem have fronts and temples made of different materials. Ask what each part is made of.
• Cores and inserts. Some temples include a metal core, which affects flexibility and adjustment.
• Documentation. Ask suppliers to state the material in writing and, where possible, supply a datasheet for the grade used.
It is common to hear that TR90 is the budget choice and Ultem the premium one. That is a market habit, not a rule. The cost of a frame depends on the resin, the mold, the molding process, finishing, hardware and order quantity. The right way to compare is to request quotes for similar designs and specifications from the same supplier and see how the price actually differs. Positioning is then a decision about how you present each frame, not something the material name decides for you.
There are no strict rules, but some tendencies help when you recommend frames:
Customer or channel | TR90 tends to suit when | Ultem tends to suit when |
Children and school use | Flexibility and forgiving feel matter | A slim, stiff frame is wanted and the style is suitable |
Sports and active use | Flex and light feel are priorities | Heat stability or a rigid structure is a priority |
Everyday and office wear | A light, comfortable all-rounder is needed | A slim, stiffer look is preferred |
Online selling | Fit forgiveness and color range help limit returns | A refined look is part of the product story |
Specialty optical shops | Variety in colors and shapes is needed | A slim, modern frame is part of the assortment |
Use the table as a starting point and confirm with samples, because frame design, grade and finish matter as much as the material name.
We do not have reliable country-by-country data on material preferences, so we avoid claiming that one market prefers one material. What you can check are the factors that actually affect performance:
• Climate. In cold regions, consider the brittleness of TR90 and ask how the supplier handles it. In very hot regions, think about heat exposure such as a car dashboard, and test samples if this is a concern.
• Fit. Nose bridge height and face width vary between markets and affect returns more than material does. Check bridge and width measurements, and pad options, for the customers you serve.
• Documentation. Different markets may have different requirements for materials and labeling. Ask your supplier what documents they can provide, and check them against the rules where you sell.
• Local sales data. Start with a small trial range and let your own sell-through data guide the next order.
• Material in writing. Ask what each part of the frame is made of, and which grade is used.
• Measured weight. Request the measured weight of the exact frame and size.
• Stress points. Inspect hinges, screw seats and temple tips for stress points.
• Adjustment. Test adjustment on a sample before promising it to customers.
• Color consistency. Check color consistency between samples and production.
• Tooling. Ask whether each style uses an existing mold or needs a new one.
• Trial order. Start with a small order and compare production with the approved sample.
IU Eyewear is based in Danyang and supplies eyeglass frames to wholesalers and optical retailers. Its website lists TR90 and Ultem among its materials, and describes ready-stock molds and brand logo printing on frames. If you are deciding between the two, request samples of comparable frames, ask for measured weights and material information, and compare feel, finish and fit before placing a first order. Confirm minimums and timelines for your specific order in writing.
The TR90 vs Ultem question is easier to answer once the facts are clear. Per datasheet density, TR90 is not heavier than Ultem, but the weight of a finished frame depends on its design. TR90 is known for flexibility, Ultem for stiffness and heat resistance, and both names are used loosely, so labels should be checked. Choose by customer, climate and channel, test samples, and let measured results, not slogans, decide.
To see what a Danyang-based supplier can offer, explore wholesale glasses frames from IU Eyewear.
To view styles and materials, download our wholesale glasses frames catalog.
For questions about samples or sourcing, contact IU Eyewear and our team will be glad to help.
