ISP's (now Ashland's) second globally approved preservative in the Optiphen family developed as an alternative for personal care formulations requiring a paraben and formaldehyde-free preservative system, particularly within lower pH systems. Optiphen Plus performs best in formulations below 6.0 pH, but is also proven effective at pH levels above 6.0.
Per Ashland, Optiphen Plus preservative should be used in cosmetic products at concentrations in the range of 0.75% to 1.5%. For the preservation of simple surfactant products a dose of 0.5% might be sufficient. For the determination of optimum dosage they recommend a preservation test, as the efficacy of this preservative is highly influenced by the product matrix. Please see the Technical Data Sheet for more information.
INCI: Phenoxyethanol (and) Caprylyl Glycol (and) Sorbic Acid
California Prop 65 Statement: The following statement is made in order to comply with the California Safe Drinking Water and Toxic Enforcement Act of 1986. This product is not known to the State of California to cause cancer, birth defects or other reproductive harm.
Recommended use levels: 0.75 - 1.5%
Appearance: Clear light yellow to dark yellow liquid