Q. In direct extrusion process at higher temperature which of the following is used to avoid friction?

 for steels, stainless steel, and high temperature materials, glass is a good excellent lubrication. the reasons for this are as follows. i. glass contains its viscosity at elevated temperatures, ii. has good wetting characteristics, and 3. glass acts as a thermal barrier between the billet, the container and the die, thus minimizing cooling.