Since 1970
Since 1970
Carbon Black ASTM Grade N660 is a general-purpose furnace (GPF) semi-reinforcing black characterized by medium-coarse particle size and moderate structure. It offers higher filler loading capacity, lower heat generation, superior resilience, and excellent flex-fatigue resistance compared to finer grades. N660 is widely used in tire inner liners, carcass plies, sidewalls, extruded weatherstripping, cable jacketing, and general molded rubber products.
Carbon Black ASTM Grade N660 belongs to the N600 series of furnace blacks characterized by coarse primary particle size (~49–60 nm) paired with a moderate structure. Under ASTM D1765 classification:
N indicates a normal curing rate.
6 designates the coarse particle size group.
60 denotes its standard general-purpose furnace character.
Because of its balance of low heat buildup and high loading performance, N660 is one of the most widely used semi-reinforcing furnace blacks in the rubber industry.
High Filler Loading Capacity: Allows high oil and carbon black loadings in rubber formulations without excessively increasing viscosity, lowering total compound costs.
Low Heat Generation (Hysteresis): Delivers excellent dynamic resilience and low internal heat buildup under continuous cyclic stress.
Superior Flex Fatigue Resistance: Imparts long service life to rubber parts subjected to continuous flexing and bending.
Impermeability: Provides strong barrier properties, making it optimal for inner liners and tubes where air/gas retention is critical.
| Property / Parameter | Typical Value | Unit | Test Standard |
| Appearance | Black Granular / Pellets | — | Visual |
| Iodine Adsorption Number | $36 \pm 4$ | g/kg | ASTM D1510 |
| Nitrogen Surface Area (NSA) | $35 \pm 4$ | $\text{m}^2/\text{g}$ | ASTM D6556 / D3037 |
| STSA (Statistical Thickness Surface Area) | $34 \pm 4$ | $\text{m}^2/\text{g}$ | ASTM D6556 |
| Oil Absorption Number (OAN / DBP) | $90 \pm 5$ | $\text{cm}^3/100\text{g}$ | ASTM D2414 |
| Compressed Sample OAN (COAN) | $74 \pm 5$ | $\text{cm}^3/100\text{g}$ | ASTM D3493 |
| Tinting Strength | $48 \pm 5$ | % | ASTM D3265 |
| Pour Density | $410 \pm 20$ | $\text{kg}/\text{m}^3$ | ASTM D1513 |
| Heating Loss (Moisture) | $\le 1.5$ | % | ASTM D1509 |
| Ash Content | $\le 0.5$ | % | ASTM D1506 |
| 45 $\mu\text{m}$ Sieve Residue | $\le 0.1$ | % | ASTM D1514 |
Tire Components: Tubeless tire inner liners, carcass plies, sidewalls, apex, and inner tube stocks.
Extruded Profiles: Automotive window channels, weatherseals, door strips, and extruded rubber tubing.
Wire & Cable: Cable sheathings, jackets, and low-voltage insulating compounds.
Molded Goods: Engine mounts, rubber mats, diaphragm seals, footwear, and industrial rubber sheets.