... carbide Double-alloy levelLevel A - containing Tungsten of 40%Level B - containing tungsten of 25%Level C - containing tungsten ... PP,PS,EVA,PU,PVC,U-PVC,etc3)PA + GF(Glass Fiber)4)Flame-resistant Reinforced Plastics5)Modified Engineering ... important parts for plastic extruders and injection molding machine,they affect the machine performance and quality directly,therefore,QunYing established quality ...