Ultem Optical Frame

Ultem Plastic Glasses (Also Known as Tungsten-Titanium or PEI Glasses)

Ultem glasses are made from a high-performance thermoplastic material known as PEI (polyetherimide). Below is a detailed description of their features and characteristics:

Material Properties

Lightweight:
Ultem frames weigh only about one-third of traditional metal frames. Each pair weighs around 9 grams, significantly reducing pressure on the nose and ears for a more comfortable wearing experience, even over long periods.

High Hardness and Wear Resistance:
The surface hardness is comparable to steel — even sharp objects or fingernails cannot easily scratch it. The frame is also highly resistant to deformation, offering excellent durability.

Excellent Flexibility:
Ultem has outstanding flexibility and can be bent 360° without breaking. This property helps prevent breakage caused by accidental squeezing, impact, or pulling, making it ideal for sports enthusiasts and children.

Heat and Corrosion Resistance:
As a flame-retardant, high-performance thermoplastic, Ultem maintains stability even in high-temperature environments and resists deformation. It is also highly resistant to sweat, cosmetics, and other corrosive substances, ensuring long-term reliability.

Eco-Friendly and Safe:
Certified as non-toxic and safe for human use, Ultem complies with ECO environmental standards and poses no health risks.

Appearance Features
Ultem material is easy to mold and color, allowing for a wide range of tones and patterns. Many Korean-imported Ultem glasses use electroplating technology, creating a strong texture with glossy or matte finishes. Some variants feature transparent colors that are crystal-clear and free of impurities, giving the glasses an elegant and premium appearance.

Manufacturing Difficulty
Ultem has a melting point of 380°C, much higher than ordinary plastics. This requires special modification of injection molding machines and the use of high-temperature, high-pressure injection processes. As a result, manufacturing Ultem frames is technically demanding and more expensive than producing standard plastic frames.

Suitable Users
Thanks to their lightweight, durable, and impact-resistant characteristics, Ultem glasses are ideal for teenagers, athletes, and people who wear glasses for extended periods, such as office workers and students. Their refined, high-end look also makes them suitable for business professionals.