It is a readily biodegradable primary alcohol ethoxylate initiated by a C9-11 alcohol and ethoxylated with an average of 8 mol EO. The CASN is 68439-46-3. This nonionic surfactant is an exceptional detergent, wetting agent and dispersant in various applications ranging from household detergents to oilfield applications. TERGITOL™ 91-8 is recommended as an NPE replacement, as the product meets the U.S. EPA Safer Choice Program’s criteria and is listed as a Safe Chemical Ingredient.