N330,N220,N550,N660 Features:1) Activity ultrafine silica, silica ... shortcomings, thereby increasing the activity of ultrafine silica and rubber affinity, wearable and put strong performance. Greatly reduce ... other rubber products. Furthermore, in a black rubber products can replace 660, 330 carbon black and high-quality, low-cost, rubber production ... 300% tensile strength MP: 2.0 - 6.0 carbon black