What makes certain glasses so… tough? TR-90 - memory plastic - 620 kg/cm² - 2x stronger than nylon 💧Don't skip drying🔥 90-110°C → 2-4 hrs 💉 230-275°C → Mold → Cool ✨ Smooth out + remove burrs 🔍 100% inspected #Firmoo #Firmoooptical #eyewear #eyeglasses #frames