TR90
DEFINITION
- TR-90, or Grilamid TR-90, is a thermoplastic material known for its flexibility, lightness, and resistance to heat and chemicals.
- It has a memory effect, returning to its original shape after bending.
- Flexibility: TR-90 frames are highly flexible and can withstand bending or twisting without breaking.
- Lightweight: They are extremely lightweight, enhancing comfort during long-term wear.
- Hypoallergenic: TR-90 is hypoallergenic, making it suitable for individuals with sensitive skin
CONS
- Limited Adjustability: Like polycarbonate, TR-90 frames may have limited adjustability compared to acetate frames .