How can viscosity index be improved?
How can viscosity index be improved? Thickeners and viscosity index improvers are polymeric, and are added to reduce lubricant viscosity changes at high and low temperatures. Mineral oil lubricants become less effective at high temperatures because heat reduces their viscosity and film-forming ability. Which of the following is viscosity index improver? Among the materials that are generally used for viscosity index improvers include polymethacrylates (PMA), polyisobutylene (PIB), radial polyisoprene and olefin co-polymers (OCP). How do you calculate viscosity index? The viscosity index according to DIN 2909 is calculated by comparing the change in viscosity of an oil with the two...