These sealing areas are preferably made by coating or impregnating these areas of {HEAD ~ the substrate} with a silicon carbide powder bonded together with about 2% of Teflon or {TAIL ~ Teflon} like polytetrafluoroethylene material to hold the powdered material in its compacted condition 
These sealing areas are preferably made by coating or impregnating these areas of { HEAD ~ the substrate } with a silicon carbide powder bonded together with about 2 % of Teflon or { TAIL ~ Teflon } like polytetrafluoroethylene material to hold the powdered material in its compacted condition
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