Basic Characteristics Of Metal Frame Glasses

Lightweight: Most injection-molded materials (such as TR, PC) have low density, are light to wear, and reduce the burden on the nose bridge and ears.

Lower Cost: Injection molding is suitable for large-scale production, with low unit cost and affordable prices.

Good Flexibility: Especially TR (memory plastic) material, which has excellent elasticity and can withstand bending or even stepping on without breaking easily.

Surface Treatment Depends on Painting: Most injection-molded frames require a sprayed surface coating, but the paint layer is prone to wear, fading, or peeling, affecting aesthetics and durability.

Cannot be Finely Adjusted: Due to high material elasticity, frames are difficult to personalize and adjust according to facial shape (such as nose pads or temple angles).

Presence of Mold Lines and Shrink Marks: Injection molding often leaves visible lines at mold seams (mold lines), and thick-walled areas may have shrinkage dents (shrink marks).

Average Comfort: Compared to acetate or cellulose acetate, injection-molded materials feel soft, have poor breathability, and can cause slipping due to sweat in summer.