Lubricant composition for use on workpieces in the hot forming of metals

Abstract

Lubricant composition for use on workpieces in the hot forming of metals, which contains: (a.sub.1) 0 to 80 percent by weight of a glass powder, (a.sub.2) 0 to 50 percent by weight of a glass frit whereby the content of at least one component (a.sub.1) or (a.sub.2) in the lubricant composition is not 0 percent by weight, (b) 10 to 25 percent by weight of natural or synthetic graphite, (c) 5 to 20 percent by weight of one or more alkali metal silicates of the general formula Me.sub.2 O.n SiO.sub.2, where Me is lithium, potassium or sodium and n is a number between 1 and 4, (d) 1 to 6 percent by weight of a water-soluble sodium polymetaphosphate, (e) 0 to 3 percent by weight of a water-insoluble sodium polymetaphosphate, (f) 0.5 to 4 percent by weight of a thickener, and (g) 0 to 1 percent by weight of borax.

Dependencies are inferred from the claim text.