Since 1970
Since 1970
Carbon Black ASTM Grade N774 is a semi-reinforcing furnace (SRF-HM) black characterized by coarse particle size and medium-high structure. It provides very high loading capability, exceptional resilience, low heat buildup, and low compression set in rubber compounds. N774 is primarily used in tire inner liners, molded industrial rubber goods, automotive hoses, belts, and seals where high flexibility, low cost, and easy extrusion are required.
Carbon Black ASTM Grade N774 belongs to the N700 series of furnace blacks characterized by coarse primary particle size (~60–80 nm) combined with a medium-to-high structure. Under ASTM D1765 classification:
N indicates a normal curing rate.
7 designates the coarse particle size group.
74 denotes its specific high-structure variation (SRF Non-Staining / High Modulus).
N774 serves as a highly economical filler black that improves processing efficiency while preserving high dynamic elasticity and low modulus flexibility.
High Loading Capacity: Allows significant volume loading of filler and plasticizers without overloading the compound viscosity, reducing unit compound cost.
Low Compression Set & High Elasticity: Delivers excellent recovery after sustained stress, making it ideal for dynamic seals and gaskets.
Minimal Heat Generation: Produces extremely low heat buildup under dynamic flex loading.
Non-Staining Behavior: Safe for use in non-staining automotive and industrial rubber applications.
| Property / Parameter | Typical Value | Unit | Test Standard |
| Appearance | Black Granular / Pellets | — | Visual |
| Iodine Adsorption Number | $29 \pm 4$ | g/kg | ASTM D1510 |
| Nitrogen Surface Area (NSA) | $30 \pm 4$ | $\text{m}^2/\text{g}$ | ASTM D6556 / D3037 |
| STSA (Statistical Thickness Surface Area) | $29 \pm 4$ | $\text{m}^2/\text{g}$ | ASTM D6556 |
| Oil Absorption Number (OAN / DBP) | $72 \pm 5$ | $\text{cm}^3/100\text{g}$ | ASTM D2414 |
| Compressed Sample OAN (COAN) | $63 \pm 5$ | $\text{cm}^3/100\text{g}$ | ASTM D3493 |
| Tinting Strength | $40 \pm 5$ | % | ASTM D3265 |
| Pour Density | $470 \pm 20$ | $\text{kg}/\text{m}^3$ | 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, sidewall non-staining strips, ply skim stocks, and inner tubes.
Automotive Seals & Hose: Engine seals, O-rings, radiator hoses, and dynamic vibration damping mounts.
Molded & Extruded Rubber Goods: Gaskets, footwear soling, conveyor belt friction layers, and rubber sheeting.
Plastic Masterbatches: Used as a pigment and cost-effective functional filler in polyolefins.