500 Gauge Polythene 4m X 50m (125mu) Black is a heavy duty 500G (polythene gauge) / 125m u (micron thickness) polythene membrane. Made from plastic and is long lasting. Both rot and waterproof with a multitude of functions. Mainly used in construction as a temporary partitioning device and can also be used for many building or gardening tasks. Our black polythene can be used domestically as furniture covering, mattress protection or for protecting floors when decorating. It can be also used in allotments or gardens as covering to keep the ground warm and dry.