I am working on a stearic acid based shave cream that becomes so thick it's almost solid at 55-60C, but when it gets to room temp the viscosity significantly decreases to ~50,000 cPs.
~5% Sodium Lauroyl Methyl Isethionate
~15% Stearic Acid
~.5% Potassium Hydroxide
Water phase and oil phase are heated to ~75C (surfactant in water phase) and combined hot via 3 blade prop. Neutralized with potassium hydroxide shortly after combining.
Final product pH is 6.5-7
Right now my concern is scale up, but I was curious if anyone had seen or knew why this phenomena existed (as I have never seen it before).