HOME > Technology > Subcritical water extraction technology SWET is a green technology for the future. It is an environmentally clean solvent, reducing solvent usage and disposal costs. Owing to the low dielectric constant of subcritical water (1〈?〈25), SWET is effective for the extraction of medium polar compounds such as flavonoids. Using the SWET, Seoul Perfumery Co. has a variety of products, such as natural flavonoids and functional food ingredients extracted from natural food materials.