Home Gard - FR wires have high oxygen and temperatureindex, that prevents the spreading offireevenathightemperature.TheHome Gard - FR wore is manufactured using99.99%Pure,Electrolyticgrade,bright annealed bare copper with more than 101% conductivity. This wire is insulated withthe flame retardant - FR PVC compound with a high oxygn and temperature index, speciallyformulated and manufactured in house.