Ammonium Lauryl Sulphate (ALS)

Ammonium lauryl sulfate (ALS) is the common name for ammonium dodecyl sulfate (CH3(CH2)10CH2OSO3NH4). The molecule consists of a long nonpolar hydrocarbon chain and a polar sulfate end group, the combination of which make the material a surfactant. These two components allow the compound to dissolve among both polar and non-polar molecules. ALS is classified as an alkyl sulfate and is an anionic surfactant found primarily in shampoos and body-wash as a foaming agent. Lauryl sulfates are very high-foam surfactants that disrupt the surface tension of water in part by forming micelles around the highly polar water molecules at the surface-air interface.

Parameter Value

CAS Number


Chemical formula


Molar mass

283.43 g/mol


yellowish viscous liquid


1.02 g/cm3

Boiling point

418 °C (784 °F; 691 K)

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