... pb 99.9 factory price port nearby advantage lead metal powder PROPERTIESGrey powder with drop form, easy to ... moist air. APPLICATIONWidely used in manufacturing porous bronze bearings self-lubricated, structural parts of powder metallurgy, friction discs, ... sheathing boards of brakes, clutches, metal-graphite electric brushes, diamond grinding wheels, bronze filters, and ...