Building 4 x 50m 250um Black Polythene - 16 Roll PalletEmpak 4 x 50m 250um Black Polythene 16 Roll Pallet Heavy Duty 250mu Cost effective water proof membrane Composite resins with 5% carbon black Pallet quantity of 16 rolls Black poly is extruded from a formulation of virgin polythene and reclaim resins at a 5% carbon loading. The carbon does provide limited U. V. protection. It is commonly used as building film within the building industry for damp proofing. Specifications Colour Black Material