CAS Number:
61789-40-0
Chemical Formula:
C19H38N2O3 (for the main component, Lauramidopropyl Betaine)
EINECS/ELINCS No:
263-058-8
COSING REF No:
33494
Description:
Cocamidopropyl Betaine (CAPB) is a widely used amphoteric surfactant (zwitterionic) derived from coconut oil. It is highly valued in cosmetic formulations for its mildness, excellent foam-boosting properties, and ability to reduce the irritation potential of other surfactants, particularly anionics like Sodium Laureth Sulfate. It is most commonly supplied as a viscous, pale yellow aqueous solution with an active matter content of 28-30%, but is also available in other grades.
Uses:
CAPB is a versatile secondary surfactant used across rinse-off personal care products for its multifunctional benefits.
· Hair & Skin Cleansing: A staple in shampoos, shower gels, facial cleansers, and hand soaps. It effectively boosts and stabilizes lather, improves viscosity, and provides a mild, smooth feel during use.
· Conditioning & Antistatic: Used in conditioners and cleansing products to soften hair and reduce static.
· Household & Industrial: Found in dish liquids and all-purpose cleaners for its foaming and cleaning efficacy.
Origin:
CAPB is a semi-synthetic ingredient. It is produced industrially in a two-step synthesis: fatty acids from coconut oil (primarily lauric acid) are first condensed with dimethylaminopropylamine (DMAPA) to form an amide, which is then quaternized with chloroacetic acid.
What does COCAMIDOPROPYL BETAINE do in a formulation?
- Surfactant / Cleansing
- Foam Booster / Viscosity Modifier
- Anti-irritant / Mildness Enhancer (for other surfactants)
- Conditioning / Antistatic Agent
Safety Profile:
· General Assessment: Considered safe for use in cosmetics. A 2024 safety assessment concluded that its use in rinse-off products at up to 30% concentration and in leave-on products at up to 6% is safe, with a sufficient margin of safety.
· Primary Safety Concern – Impurities: The main risk of skin sensitization and allergic contact dermatitis is linked to residual manufacturing impurities, specifically amidoamine (AA) and dimethylaminopropylamine (DMAPA). High-purity grades with controlled impurity levels are less likely to cause reactions.
· Irritation Potential: In its raw, concentrated form, it can cause skin and eye irritation. Properly formulated into final products at typical use levels, it is known for its mildness.
Technical profile: (for 28-30% Active Aqueous Solution)
| Property | Values |
| Appearance | Viscous, clear to pale yellow liquid |
| Active Matter | 28-30% (Commercial grades also commonly available at ~35%) |
| pH (as supplied) | Typically close to neutral |
| Density | 1.05 g/cm³ at 20°C |
| Typical Use Concentration in Final Formulas | 2.5% - 5.0% (as a secondary surfactant/foam booster) |
| Solubility | Readily soluble in water |
| Viscosity | < 100 cP at 30°C (for 30% active solution) |