Using Dipropylene Glycol in Lotions and Melt & Pour Soap

Thank you for your order and for reaching out! It's great you're exploring ways to enhance your formulations.

You are correct that Dipropylene glycol is commonly used to help fragrance oils and essential oils last longer. It acts as a solvent and a fixative, which helps to slow down the evaporation rate of the fragrance.

While Dipropylene glycol is miscible with water and can be incorporated into formulations like lotions and melt & pour soap, its primary recommended use, based on the product information, is as a base or diluent for the fragrance oil itself. The suggested usage rate of 1-100% is specifically for mixing with the perfume/fragrance oil before adding it to your product base.

Adding the fragrance pre-diluted with Dipropylene glycol can help distribute the scent more evenly and improve its longevity in your final product. The amount of this diluted fragrance mixture you add to your lotion or soap would then follow the typical recommended fragrance usage rates for those specific product types (usually a small percentage, like 0.5% to 2% of the total formulation, depending on the fragrance strength and desired intensity).

Adding Dipropylene glycol directly to your lotion or soap base without pre-mixing with the fragrance is not the standard method described for its use as a fragrance enhancer, and there isn't a specified safe usage rate for it when used this way within the final product base itself. It's best to use it as intended: as a diluent for your fragrance oil before incorporating the scented oil into your formulation.

We hope this helps you with your lotion and soap making! We look forward to being your long-time supplier.