Alpha Olefin Sulphonate, or α-Olefin sulfonates, commonly called AOS for short, is a third-generation anionic surfactant. It’s biodegradable, mild, and resistant to hard water, yet with outstanding detergency and excellent compatibility with other types of surfactants.
It’s widely used to formulate high-foaming heavy-duty detergent as the secondary surfactant alone with Linear Alkyl Benzene Sulphonic Acid (LABSA) or to formulate mild light-duty detergents and personal care products, such as hand soap liquid, shampoo, baby bubble bath, and so on.
There are commonly two types of AOS commercially available, the liquid solution(with 33%-40% active matter content) and the dry powder(with 85%-95% active matter content). The choice of these two types is based on the formulation target, transporting and handling convenience, and cost.
| Chemical Name | Sodium alpha-olefin sulfonate / α-Olefin sulfonates | |
| Synonyms | AOS, Sodium c14-16 olefin sulfonate | |
| CAS Number | 68439-57-6 | |
| Classification | Anionic surfactant | |
| Molecular Formula | CH-(CH2)n-SO3Na/R2-CH(OH)-(CH2)n-SO3Na | |
| Appearance (25℃) | Light yellow transparent liquid | White or slightly yellow powder |
| Forms | AOS 35% liquid | AOS 92% powder |
| Odor | Slight characteristic odor | Slight characteristic odor |
| Water solubility | N/A | Highly soluble |
| Active Substance (%) (Lab Grade) | 34 ~ 36 | 90 ~ 94 |
| Unsulfated compounds content, % | ≤1.5 | ≤5 |
| Sodium sulfate (Na2SO4) content, % | ≤0.7 | ≤6.0 |
| Free alkali (NaOH) content, % | ≤0.5 | ≤1.0 |
| Color (Hazen, 5% a.m. solution) | ≤60 | N/A |
| Whiteness (WG) | N/A | ≥80 |
| Packing | 200kg plastic drum, bulk | 25kg composite bag |
25kg composite bag packaging.
200kg plastic drum packaging, bulk packaging.
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