Reducing Foam in Low-Water Formulations

Regarding your question about using 1,3-Propanediol to reduce foam in your formulation with 30% water:

1,3-Propanediol is primarily known for its properties as a humectant, solvent, and preservative booster. While its solvent properties might indirectly influence the formula's viscosity or surface tension, it is not typically used as a primary anti-foaming agent.

Adding 3% 1,3-Propanediol, while within its recommended usage rate (1-20%), is unlikely to be sufficient to significantly reduce substantial foam caused by surfactants or the mixing process itself in a low-water system.

If foam reduction is a critical concern, you might need to consider incorporating dedicated anti-foaming agents designed for cosmetic formulations.

If you still wish to include 1,3-Propanediol for its other benefits, it is water-soluble and can generally be added to the water phase or incorporated during the mixing process.