| http://www.w3.org/ns/prov#value | - The solution serving as the lubricant will preferably have alkali metal hydroxide, acetate, phosphate or carbonate, particularly sodium, more particularly sodium phosphate or carbonate, at a concentration in the range of about 0.01 to 2 M, particularly 0.05 to 0.5 M, and at a pH in the range of about 6-11, more normally about 7-9, preferably 7-7.5.
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