| prov:value
| - The lubricant materials are preferably selected from the group of metal sulfides (e.g. tungsten disulfide, molybdenum disulfide), carbon (e.g. graphite, glassy carbon, amorphous carbon, etc.), hydrogenated carbon, boron nitride, polymeric materials including polytetrafluoroethylene (PTFE, DuPont Teflon S), polystyrene, polyurethane, polycarbonate, ABS, polyimides, polyamides, polyphenylene, polyet
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