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