Product Name: Sodium Alpha Olefin Sulphonate Synonym: AOS; ± -AOS; Sodium ±- Olefin Sulfonate; Sodium Alpha Olefin Sulfonate. CAS No: 68439-57-6 EINECS No.: 270-407-8 Appearance: AOS 35% Liquid: Light Yellow Liquid. AOS 92% Powder: White or light yellow powder.