Back to Ingredient Dictionary

AMMONIUM LAURETH-9 SULFATE

Description

Ammonium Laureth-9 Sulfate is a versatile surfactant widely used in personal care and cosmetic products. This anionic compound is derived from lauryl alcohol, which undergoes ethoxylation and sulfation processes before being neutralized with ammonium hydroxide. The "9" in its name refers to the average number of ethylene oxide units added during ethoxylation.

As a primary surfactant, Ammonium Laureth-9 Sulfate effectively reduces surface tension between water and oils, making it an excellent cleansing agent. It produces a rich, stable foam and helps to emulsify oils and remove dirt from skin and hair. This ingredient is milder than its counterpart, Sodium Lauryl Sulfate, due to the ethoxylation process, which reduces potential skin irritation.

In formulations, Ammonium Laureth-9 Sulfate is typically used at concentrations between 5-15%. It performs well in a wide pH range and is compatible with most other cosmetic ingredients. While effective, it may still cause dryness in some individuals with sensitive skin. Formulators often pair it with secondary surfactants or conditioning agents to balance its cleansing power with moisturizing properties.