Adjusting Viscosity with Salt in Surfactant Formulations

Adjusting the viscosity (thickness) of a formula containing Cocamidopropyl Betaine with salt (Sodium Chloride) depends on the other surfactants in your formula:

1. When used with Anionic Surfactants: If you are using Cocamidopropyl Betaine as a secondary surfactant (Co-Surfactant) alongside anionic surfactants (such as SLES or SLS), adding salt will effectively increase the viscosity. The salt helps the surfactant micelles pack more closely together, creating a thicker texture.
2. When used alone: If Cocamidopropyl Betaine is the only surfactant in your formula, adding salt will not significantly increase the thickness.

Recommendations for thickening:

• If your formula does not contain anionic surfactants and you need it to be thicker, you may need to use a water-phase thickener or a specialized surfactant thickener instead of salt.
• When using salt, it is recommended to add it gradually (usually 0.1% to 2%) and observe the results, as adding too much salt can cause the formula to become thin again (the "salt curve" effect) or become unstable.