Anionic surfactant has a longest history, highest output and most various types. It is classified according to the structures of their hydrophilic groups: sulfonates and sulfates, which are the main types of anionic surfactants. The various functions of anionic wetting agent are mainly manifested in changing the properties of the liquid surface, the liquid-liquid interface and the liquid-solid interface.

Sodium Laureth(2) Sulfate (AES/SLES)
Chemical Formula: C12H26Na2O5S
CAS No.: 68585-34-2
Dangerous Grade: Non-dangerous
Sodium Alpha Olefin Sulfonate (AOS-35)
Chemical Formula: R-CH=CH-(CH2)n-SO3Na
CAS No.: 68439-57-6
Dangerous Grade: Non-dangerous
C12-14 Linear Alkyl Benzene Sulfonate（LAS）
Chemical Formula:C18H30O3S
CAS No.:27176-87-0
Dangerous Grade: 8
Common anionic surfactant:
Sulfate, sulfonate, and phosphate esters