SF-1T is a new kind of SF-1 which composes of a specially designed surface layer of PTFE formulations and is specifically applied for the high PV bushes of gear oil pumps.SF-1T is to be used in hydrodynamic or boundary lubricating condition of medium or high pressure gear oil pumps such as P=16-25Mpa,V=3.5-5m/s.It shows the benefit of low friction coefficient,wear resistant and anti-impact properties.At hydrodynamic lubrication,the PV limit reaches to 120N/mm2.m/s.It is a best choice for various kinds of gear pumps as well as plunger pumps,vane pumps and so on.