| http://www.w3.org/ns/prov#value | - The surface may be any surface which is substantially impermeable to the MFC, i.e. the surface is impermeable to a major part of the MFC. The surface may be of any suitable material such as stainless steel alloys, plastics/synthetic polymers, rubber, board, glass, wood, paper, textile, concrete, rock, marble, gypsum and ceramic materials which optionally may be coated, e.g. with paint, enamel, pol
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