This layer is only used for multi-core cables.

Symbol
$M_{\mathrm{f}}$
Unit
-
Related
$\rho_{\mathrm{f}}$
Choices
IdMaterial name
FPOCFibrous polyolefin copolymer (POC)
FPPFibrous polypropylene (PP)
PVCShaped polyvinyl chloride (PVC)
PEShaped polyethylene (LDPE)
PRPlastic rods, solid
PTPlastic tubes, hollow
TYTwisted yarns
JuteJute
tapeWater-blocking tapes
AirAir
OtOther (user defined)