Bot Chart, page-143

Siloxanes are most widely used in the cosmetics industry, adding beneficial qualities such as spreadability, enhanced skin feel, reduction in greasiness, increased absorption, that silky shiny look, and more. Their influence does not stop there though; siloxanes are a popular additive to plastic products since they provide numerous desirable qualities including flexibility, abrasion resistance, and heat resistance. Siloxanes are even used by the food industry as an oil substitute to create low-calorie alternative food products such as potato chips, salad dressings, and mayonnaise.

Probably Permetrex belongs to this class of ingredient. However they have done something else to it of course to improve permeability at a substantially lower dosage. Up there for thinking.