The same excellent quality bright-orange linear polyethylene material as used in many pieces of Chance cover-up equipment is also available in 4- x 6-foot sheets for use in substations and as underground barriers. Cutting smaller pieces is accomplished with any hand or power saw used to cut wood- forming the sheets may be accomplished with a blow torch or in an oven heated to 250˚F. Although the sheet becomes increasingly stiff as temperatures drop, it does not become brittle and break at-50˚F, and it will not soften or deform at 170˚F. The material will not flash flame. Puncture strength is 300 volts per mil.