In spin casting, after the surfaces are formed, which process occurs that uses UV light to solidify?

In spin casting, after the surfaces are formed, which process occurs that uses UV light to solidify?

• A. Cooling
• B. Curing
• C. Sealing
• D. Hardening

Answer: (B)

UV curing is the step that solidifies the formed surface when exposed to UV light. In spin casting, you create the lens surface from a photopolymerizable resin that contains photoinitiators. When UV light shines on the resin, these initiators generate reactive species that start polymerization, turning the liquid monomer into a cross‑linked solid network. This curing process locks in the shape and optical properties, making the lens dimensionally stable and ready for use. Cooling would not cause this chemical hardening, sealing is about closing gaps rather than solidifying the material, and hardening is a broad term that doesn’t specifically describe the UV‑initiated chemical reaction at play here.

UV curing is the step that solidifies the formed surface when exposed to UV light. In spin casting, you create the lens surface from a photopolymerizable resin that contains photoinitiators. When UV light shines on the resin, these initiators generate reactive species that start polymerization, turning the liquid monomer into a cross‑linked solid network. This curing process locks in the shape and optical properties, making the lens dimensionally stable and ready for use. Cooling would not cause this chemical hardening, sealing is about closing gaps rather than solidifying the material, and hardening is a broad term that doesn’t specifically describe the UV‑initiated chemical reaction at play here.