Lemon

Lemon makes nanofiber-based filter materials, ultra-fine fibrous sheets used to physically block microscopic particles, including fine dust and airborne pathogens.

Its products serve markets such as automotive cabin-air filters, industrial air-handling systems, and specialty defense filters designed to screen out chemical, biological, radiological, and nuclear agents. The company is also active in developing nanofiber alternatives to PFAS (per- and polyfluoroalkyl substances, a class of persistent synthetic chemicals now facing regulatory restrictions in Europe and the United States) for use in outdoor apparel and equipment. Lemon is listed on KOSDAQ, South Korea's tech and small-cap exchange.