Features of different grades carbon black  CARBON BLACK N220  Characteristic: Good abrasion resistance and crack resistance. Its stress at definite elongation is lower.  Typical application: Enhanced carbon black; Tire tread, high quality industrial rubber products and high load conveyor belt.  CARBON BLACK N330  Characteristic: Good abrasion resistance and middling lag.  Typical application: Tire belted layer; Tire side; Outer layer of roller; Industrial rubber products; Car tire tread.  CARBON BLACK N550  Characteristic; It boasts the best reinforcing performance among the semi-reinforcing varieties, excellent extruding performance as well as low resilient rate.  Typical application: Tire body and inner tire compound; Tube; Extruding bar, seal and mould rubber product.  CARBON BLACK N660  Characteristic: It features lower reinforcing ability, smaller structure, higher lips expansion and greater fill amount.  Typical application: Tire body and inner tire compound; Normal mould and extruding application; Monolayer moisture proof product.