What Is The Function Of Stpp In Liquid Soap Making

STPP (sodium tripolyphosphate) is a common ingredient in liquid soap making. Its function is to act as a water softener, which means it helps to counteract the effects of hard water. Hard water contains high levels of minerals like calcium and magnesium, which can interfere with the cleansing action of soap by forming insoluble salts with the soap molecules.

STPP works by sequestering (binding up) these mineral ions, preventing them from interfering with the soap's ability to clean. This allows the soap to form a more effective lather and achieve better cleaning results. In addition, STPP can also help to stabilize the viscosity of the soap and improve its overall quality and appearance. It is important to note that STPP has come under scrutiny for its potential environmental impact, and some soap makers may choose to use alternative ingredients or formulations.