About 1, 2-Hexanediol
1,2-Hexanediol ( 1, 2-Hexanediol ). This polyol, which is currently not listed as a preservative, is defined as a moisturizer or a penetration aid. The addition amount is about 5%, which has a clear antiseptic effect. Therefore, most brands take such ingredients, replace preservatives, and claim no preservative formulations. However, the bacteriostatic effect of this type of ingredients is relatively negative, and it is impossible to grasp whether or not the pollution during use after opening. The anti-corrosion environment after opening is very different from the anti-corrosion environment at the time of sealing. As a result, preservative-free products tend to be conservative in shelf life.