High quality coaxial electrical cables employing insulation of {TAIL ~ fluorocarbon elastomers}, tetrafluorethylene propylene polymers and {HEAD ~ silicon} are all suitable, with tetrafluorethylene propylene polymers being slightly preferred 
High quality coaxial electrical cables employing insulation of { TAIL ~ fluorocarbon elastomers } , tetrafluorethylene propylene polymers and { HEAD ~ silicon } are all suitable , with tetrafluorethylene propylene polymers being slightly preferred
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