Solubility Properties: Phenoxyethanol has limited solubility in water (approximately 2.7%), but good solubility in the oil phase, and is soluble in most cosmetic oils and fragrances. This amphiphilic nature allows it to distribute evenly between the aqueous and oil phases in emulsions and creams, providing comprehensive preservative effects. Heating can increase its solubility in water, but excessively high temperatures can lead to volatilization losses.
Chemical Stability: Phenoxyethanol is chemically stable and does not easily decompose under normal storage and use conditions. It is resistant to acids and alkalis, and stable within a pH range of 3-9. It is not easily oxidized and does not react adversely with most cosmetic ingredients. It is stable to light and heat, but may be oxidized in the presence of strong oxidizing agents. This characteristic allows it to maintain long-term effectiveness in complex formulations.
Sensory Properties: Phenoxyethanol has a faint aromatic odor and a slight burning taste, which is noticeable at high concentrations. At recommended concentrations (≤1.0%), its odor is usually masked or undetectable by fragrances. It has low irritation to skin and mucous membranes, making it suitable for products for sensitive skin.
Safety Characteristics: Phenoxyethanol is recognized as a safe and effective preservative by major global cosmetic regulations, exhibiting low toxicity and low irritation. Its irritation to skin and eyes is far lower than that of traditional preservatives (such as formaldehyde releasers and isothiazolinones). At recommended concentrations, it is non-sensitizing, non-phototoxic, and non-carcinogenic. However, some sensitive individuals may experience mild irritation. It is recommended to wear protective gloves and goggles during handling to avoid contact with high concentrations.
