Chloroxylenol (PCMX) at 0.15% in Liquid Soap

Using Chloroxylenol (PCMX) at a concentration of 0.15% in a liquid soap formula is primarily for its disinfectant properties, aiming to kill germs present during use.

However, disinfection and preservation are distinct functions:

• Disinfection: Killing microorganisms at a specific point in time.
• Preservation: Preventing the growth of microorganisms over the product's shelf life to maintain safety and stability.

According to the information available, the FDA allows Chloroxylenol to be used as a preservative in cosmetic formulas at a maximum rate not exceeding 0.5%. While 0.15% has disinfectant activity, it is below this recommended maximum for preservation.

Therefore, even though 0.15% Chloroxylenol provides disinfectant benefits, it is generally necessary to include a separate, broad-spectrum preservative system in your liquid soap formula to ensure long-term microbial stability and prevent contamination throughout its shelf life.