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GLASS LUBRICATION for hot extrusion of metals was first patented by M. Sejournet and is now widely used. A billet is coated with glass powder, as it emerges from the annealing furnace. This melts and protects the surface from oxidation, and also provides low friction against the container of the...
This is a further contribution from our correspondent who is a maintenance engineer in South Africa and whose forthright opinions and practical experiences are always of interest to our readers.
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