| http://www.w3.org/ns/prov#value | - A method for improving the adhesion of a rubber composition, containing a sulphur vulcanizer, with copper, brass or other metals coated therewith said method comprising adding at least one compound selected from the group consisting of orthoboric acid, zinc borate, manganese borate, calcium borate, lead borate, cobalt borate and sodium borate to the rubber composition in a ratio of 0.1 to 5 weight
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