Full definition
An elastomer sheet formulated with high electrical insulation properties (dielectric strength) to protect workers from electric shock when working on or near energized electrical equipment. Classified by maximum working voltage per ASTM D178: Class 0 (max 1,000 V AC, red or black), Class 1 (7,500 V, white), Class 2 (17,000 V, yellow), Class 3 (26,500 V, green), Class 4 (36,000 V, orange). Minimum dielectric proof-test voltage is approximately 2.5-3x the rated working voltage. Material: typically NR or SBR with specific insulating compound (no carbon black or conductive fillers — uses kaolin, CaCO₃, or silica instead). Thickness: 3-6 mm (Class 0) to 6-12.5 mm (Class 4). Width: 900-1,200 mm rolls, standard lengths 5-10 m. Surface: smooth and free of any conductive contamination. Must be inspected before each use (visual check for cuts, punctures, embedded objects) and electrically re-tested every 6-12 months. Per ASTM D178 and IEC 61111. Applications: electrical panel floor mats, switchgear rooms, substation floors, and portable work mats for electricians. Often used with dielectric gloves and footwear as part of a complete electrical PPE system.