BIO-TERGE® AS 90 foaming surfactant Sodium C14-16 Olefin Sulfonate, also known by the trade name BIO-TERGE® AS 90, is a top- performing surfactant used in a variety of products. It has excellent wetting, foaming, properties in alkaline, acid, or neutral product and in the presence of metallic salts commonly found in hard waters. It is sulfate free and biodegradable. BIO-TERGE® AS-90 can be used in many personal care products, such as facial cleansers, body washes, bar soaps, even laundry and dish detergents.