Grade

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 Function & Compounding
ASTM Tread Grades:
N110 Gives maximum abrasion resistance, highest reinforcement and tensile. Used in off the road tire treads, tread rubber, bridge pads and conveyor belts.
N121 A high structure carbon black giving maximum treadwear but dispersing as easily as N200 series.
N134 Provides superior abrasion resistance. Used in truck and passenger tire treads.
N220 Provides excellent abrasion resistance, high tensile, good tear properties, and moderate electrical conductivity. Used in truck and passenger tires, and mechanical goods.
N231 Low structure, high abrasion resistance, used mainly in tires where resistance to tear is important.
N234 Provides superior abrasion resistance vs. N220. Excellent wear and extrusion properties typical of improved process high structure blacks. Used in all elastomers, especially SBR/BR blends for treads and tread rubber.
N299 Provides abrasion resistance superior to N339, N375, N220, and comparable to N234. Used in truck and passenger tires, tread rubber, and mechanical goods.
N326 Low structure, high reinforcement, high tensile strength, very resistant to tear and chipping in natural rubber compounds. Used in mechanical goods, tire carcasses, belts, and off the road tread.
N330 Provides good abrasion resistance with high resilience, easy processing, and good tensile and tear properties. Wide range of applications in natural rubber and synthetic rubber compounds for both tires and mechanical goods.
N339 Provides superior wear and cut growth resistance vs. N347. Excellent wear and extrusion properties typical of improved process high structure blacks. Used in passenger treads, tread rubber, and mechanical goods.
N343 Provides superior wear and processability. Similar to N339 but with higher structure. Used in passenger and truck treads.
N347 Used in NR and SR polymers. Provides excellent processing characteristics and permits use of high oil loading with low die swell. Better hysteresis properties than improved treadwear versions. Used in treads, tread rubber, and mechanical goods.
N351 Provides good abrasion resistance in the N330 range. High structure, high modulus black with easy processing characteristics. Excellent dynamic properties. Used in the tire tread and carcass compounds and mechanical goods.
N358 Extra high structure. This can accommodate more oil than normal for equivalent modulus and hardness. Used in tire treads, tread rubber, and mechanical goods.
ASTM Carcass Grades:
N550 Imparts medium abrasion resistance, high strength, low shrinkage, and die swell. Provides fast, smooth extrusions and relatively high resilience. Used in tire carcasses, cushion gum, tubing, cable jacketing, plastic conduit compounds and in extruded goods requiring excellent dimensional stability.
N650 High structure, medium reinforcement gives low die swell, smooth extrusions, and easy processing plus economical compounding. Used in tire carcasses and sidewalls, cable jackets, inner tubes, and hoses.
N660 Moderately reinforcing grade. Excellent general purpose black. Provides good reinforcement, low heat generation, smooth processing to all elastomers. Used in tire carcass sidewalls and mechanical goods.
N762 Moderately reinforcing grade, gives high resilience and excellent dynamic properties, low hysteresis, and high loadings obtainable. Used for extruded goods, belts and hoses, and molded goods. Also used in plastic color concentrates.
N772 Moderately reinforcing grade, gives high resilience and excellent dynamic properties, used in tire carcass and mechanical goods.
N774 Moderately reinforcing grade, gives high resilience and excellent dynamic properties, low hysteresis, and high loadings obtainable. Used in tire carcasses and sidewalls, extruded goods, belts and hoses. Also used in plastics color concentrates.
Specialty Grades:
SR155 High surface area, high tint tread black for truck or racing tires; provides excellent abrasion resistance.
SR310 High structure version of N330 for increased modulus.
SR401 N400 series black for synergistic properties.