Who invented spin casting?

Who invented spin casting?

• A. Carl Zeiss
• B. Louis Pasteur
• C. Otto Wichterle
• D. Buckminster Fuller

Answer: (C)

Spin casting distributes a liquid polymer between curved molds by spinning, so centrifugal force forms a thin, uniform film that can be polymerized into a soft hydrogel lens. This technique was developed in the 1960s by Otto Wichterle (with Drahoslav Lím), enabling the practical production of soft contact lenses from hydroxyethyl methacrylate (HEMA). The other names are notable for contributions in entirely different fields—optical instruments, microbiology, and architecture—so they aren’t connected to the invention of spin casting.

Spin casting distributes a liquid polymer between curved molds by spinning, so centrifugal force forms a thin, uniform film that can be polymerized into a soft hydrogel lens. This technique was developed in the 1960s by Otto Wichterle (with Drahoslav Lím), enabling the practical production of soft contact lenses from hydroxyethyl methacrylate (HEMA). The other names are notable for contributions in entirely different fields—optical instruments, microbiology, and architecture—so they aren’t connected to the invention of spin casting.