... , our government invited him to China for enhancing our domestic bulletproof material study,worked for Body Armour Institute of PLA(the People ... X 25mm, weight 1.5-1.7Kg.NIJ III alumina ceramic plate: size 300mm X 250mm X 18mm, weight 2.4Kg.NIJ ... X 6mm, weight 3.5Kg.NIJ IV alumina ceramic plate: size 300mm X 250mm X 22mm, weight 3.0Kg.NIJ IV carborundum ceramic plate: size 300mm ...