From among various types of Biral products, the two most common types are listed below with their respective specifications. VG-HT Type: Penetrates deeply into difficult to access parts and sets into a grease type consistency which is very water repellent. PO Type: An effective rust remover which serves as a lubricant and also prevents against further corrosion. It has exceptional penetrating qualities reaching all parts of the machine, leaving behind a thin, rust preventing film.