Injection molded eyeglass frames are made by injecting molten plastic into a mold and letting it cool and solidify. They are commonly found in mid- to low-end eyewear products.
Common Types and Characteristics of Injection Molded Materials
PC (Polycarbonate)
Advantages: High impact resistance (once used in bulletproof glass), low cost, suitable for sports glasses.
TR (TR90, Nylon 12 high polymer material)
Advantages: Ultra-light (can float in saltwater), flexible, strong memory, high temperature resistance (short-term up to 350°C), impact resistance more than twice that of ordinary nylon, meets food-grade safety standards.
Plastic Steel (Tungsten Titanium/Nylon based)
Advantages: Higher strength than TR, allows for ultra-thin frames, texture close to metal.
Carbon Fiber (mostly used for temple decoration)
Advantages: Lightweight, high strength, unique texture.
Which Material is Best for Eyeglass Frames
Eyeglass Frame Material Overview: Choose the One That Suits You
Selection Recommendations
Prefer unpainted, one-piece TR90 or PC frames to avoid peeling issues. You can judge by observing the metal screw interface at the hinge: if it is painted, it is likely a painted model.
