Emulsion of two different phases is usually used for the production of highly viscous pharmaceutical products such as gels, creams and ointments. One of the phases contains mineral oils or silicone, while the other is usually aqueous and is where thickeners, stabilisers, preservatives, etc. are dissolved.
The active ingredients are added to one of the above described phases or afterwards depending on the specific application.
The final product is highly viscous, that makes it hard to manipulate once the transfer process is complete, and it leads to the loss of product.