PTFE black pipe Opaque, black, filled with carbon or graphite, any size. PTFE black pipequality: homogeneous in structure, smooth surface without air bubble, and mechanical scratch. A few exogenous impurity is permitted.Application: insulation coat for wire and so on. date: Density: 2.1-2.3g/cm3; Tensile strength: over 25.0MPa; tear elongation: over 150%