Cocamidopropyl - CAPB 30 Formulation Guide

CAPB 30 is a commercial grade of Cocamidopropyl Betaine, an amphoteric or zwitterionic surfactant widely used as a secondary surfactant in cleansing systems. The “30” typically indicates approximately 30% active surfactant, although the exact specification varies by manufacturer. Stepan, for example, supplies 30% active Cocamidopropyl Betaine grades, while Mars' current specification lists approximately 29-33% betaine content with additional limits for salt, moisture and pH.

Cocamidopropyl Betaine carries both positive and negative ionic functionality within its molecular structure and is classified as an amphoteric surfactant. In compatible cleansing formulations it can function as a secondary surfactant, helping support foam quality, cleansing performance and viscosity development. COSMILE lists cleansing, foam boosting, viscosity control, antistatic and hair-conditioning functions for Cocamidopropyl Betaine.

CAPB is frequently blended with primary surfactants rather than used as the only cleansing ingredient. In systems containing compatible anionic surfactants such as SLES, CAPB can contribute to foam structure and viscosity response, allowing formulators to adjust product texture and lather characteristics. The final result depends on the surfactant ratio, active matter, salt level, pH, electrolyte concentration and other formulation components. Stepan specifically identifies Cocamidopropyl Betaine as a foam booster and viscosity builder.

When comparing CAPB 30 grades, buyers should look beyond the product name and evaluate the complete technical specification. Important parameters can include active/betaine content, dry matter, sodium chloride, pH, colour, viscosity and moisture, along with impurity controls appropriate to the intended application. Mars' current CAPB 30 specification lists 29-33% betaine, maximum 6.5% salt, 36-39% dry content and pH 5.0-8.0. For cosmetic applications, formulators should also evaluate the impurity profile and ensure the finished system meets applicable destination-market requirements.