Supply TR90 frames with spring hinges for enhanced flexibility and fit.

TR90 (also known as Grilamid) is a high-performance, nylon-based thermoplastic polymer originally developed in Switzerland. Its magic lies in a unique combination of properties that are ideal for eyewear. First and foremost is its exceptional flexibility and memory. A TR90 frame can be bent significantly—far beyond what acetate or metal can tolerate—and will return to its original shape without permanent deformation. This “superelasticity” makes it incredibly impact-resistant and durable. Secondly, it is remarkably lightweight, often 20-30% lighter than acetate, reducing wearer fatigue. Thirdly, it is hypoallergenic and resistant to UV degradation and temperature extremes. For brands, a TR90 frame represents a product that solves the core problem of breakage, appealing directly to practical consumers seeking long-term value and comfort.

While no material is literally unbreakable under all conditions, TR90 frames are as close as it gets in the eyewear industry under normal use. Their defining characteristic is flexural strength and fatigue resistance. Instead of cracking or snapping like acetate or bending permanently like metal when dropped or sat on, a TR90 frame will flex, absorb the impact energy, and rebound. They are designed to survive the kinds of accidents that typically destroy other frames: being crushed in a backpack, accidentally sat upon, or twisted by a child. We subject our TR90 frames to rigorous torture tests, including repeated flexing and drop tests, to validate this performance. For all practical purposes, marketing them as “virtually unbreakable” or “extremely durable” is an accurate and powerful selling point.

Comfort is engineered into our TR90 frames from the molecular level up. The inherent lightweight nature of the material is the first comfort factor. We further enhance this through intelligent design: using thin-walled constructions and hollow core temples where possible to shave off every unnecessary gram. The flexibility of TR90 also contributes to comfort, as the frame can adapt slightly to facial movements without pinching. We pay meticulous attention to ergonomic details: sculpting the nose bridge to distribute weight evenly, designing temple tips with soft silicone sleeves for a secure, non-slip grip, and calibrating spring hinges for just the right amount of tension. This holistic approach ensures our TR90 frames are not just tough, but also exceptionally comfortable for all-day wear.

Yes, modern TR90 frame manufacturing offers excellent versatility in aesthetics. While early TR90 was often limited to translucent or solid dark colors, advancements in molding and finishing now allow for a wide range. We can produce TR90 frames in vibrant solid colors (reds, blues, greens), sophisticated translucent tones, and even create two-tone or marble effects through advanced injection molding techniques. The style range is also broad: from sleek, minimalist sports wraparounds and classic wayfarer shapes to modern geometric designs and fun, sculpted styles for kids. While it may not replicate the deep, layered look of acetate, a contemporary TR90 frame can be both highly stylish and technically superior.

Absolutely. The properties of TR90 make it an excellent platform for both optical frames and sunglasses. For optical glasses, its durability is a major advantage for everyday prescription wear, especially for children or active adults. The lightweight nature reduces pressure on the nose from heavier prescription lenses. For sunglasses, TR90 is ideal for sports and performance models due to its flexibility and impact resistance. It can be molded into secure, wrap-around styles that stay put during activity. Whether for holding prescription lenses or tinted sun lenses, a TR90 frame provides a reliable, comfortable, and safe foundation, making it a versatile choice for brands looking to build durable lines across categories.

Producing a high-quality TR90 frame is a precise science. It starts with sourcing certified, pure TR90 resin pellets to ensure material integrity. The core process is injection molding. The pellets are heated and injected under high pressure into precision-made steel molds. The critical factors are temperature, pressure, and cooling time—any deviation can cause weaknesses or imperfections. After demolding, frames undergo precision trimming to remove excess material (flash). Hinges are then assembled—often using metal cores for reinforcement in key stress areas. The final step is quality verification: we check dimensional accuracy, hinge function, and most importantly, we perform flex tests on samples from each batch to confirm the frame returns to its true shape, ensuring the “memory” property is fully activated. This controlled process guarantees every TR90 frame meets our performance standards.