Optiphen is a clear liquid and a great preservative to use when you are making lotions, as it helps to keep them nice and creamy. Optiphen is a natural broad-spectrum preservative for cosmetics that can be easily added directly to the formulation during pre- or post-emulsification at or below 60 degrees C(140 degrees F). There are no ph restrictions in formulating with Optiphen. Optiphen is compatible with most ingredients used in the personal care industry.<br><br> <b>Usage rate:</b> 3-1% of the total weight of the recipe and must be used at temperatures lower than 140 degrees. Optiphen is a paraben and formaldehyde-free preservative. <b>Benefits:</b><br> Water Soluble<br> Natural Preservative<br> Broad Spectrum<br> effective pH range up to 6.0<br> Preservatives for lotion and soap making