Hydrophilic, ether-type nonionic surfactant manufactured by addition polymerization of ethylene oxide to cetanol. This product complies with the Japanese Pharmaceutical Excipients 2003 "Setomacrogol 1000." It is widely used as an emulsifier and has strong emulsifying ability in various emulsification systems. Emulsions with excellent stability over time and a good texture can be prepared. This product is stable against acid and alkali.