Emulsifying wax is a mixture of a wax material (either vegetable or petroleum derived) treated with a detergent (typically sodium dodecyl sulfate or polysorbates) to cause it to make oil and water bind together into a smooth and stable emulsion. It is a white waxy solid with a low fatty alcohol odor. Essential ingredient in soaps and creams.
Int J Pharm. 2009 Nov 3;381(2):220-30. doi: 10.1016/j.ijpharm.2009.07.007.