1．Cloth cloth, cotton paper isolation (PAPER) - only play the role of isolation, usually expressed by "P".
2．Maillard tape - mainly refers to the polyester film, generally only plays an isolation role, generally expressed as "MYLAR".
3．FM-PP membrane isolation is mainly used in high impedance wire.
4．Copper foil isolation (usually used in machining plugs).
5．Aluminum foil isolation (single-sided AL, double-sided AL, spread-wing AL, copper-steamed aluminum foil) is made up of aluminum foil, whose main function is to prevent electromagnetic interference, generally expressed as "AL".
6 . Filling: (PVC strip, linen filling, bullet-proof silk, cotton thread, Tetron) Filling function is mainly to twist the wire and increase the weight of wire and swing test function.