ASTM D1765 furnace grades N220 through N660 · pelleted · for tyres, rubber goods and cables.
Budcon International supplies pelleted virgin furnace carbon black across the full hard-black and soft-black range, manufactured per ASTM D1765. Each shipment carries a Certificate of Analysis reporting NSA, CTAB, DBP, Iodine Number, Ash and pH.
| ASTM Grade | Class | NSA (m²/g) | DBP (cm³/100g) | Iodine (mg/g) | Primary Use |
|---|---|---|---|---|---|
| N220 | Hard — Tread | 114 | 114 | 121 | Tyre treads · high abrasion |
| N234 | Hard — Tread | 119 | 125 | 123 | Tyre treads · wet grip |
| N330 | Hard — General | 84 | 102 | 82 | Tread/carcass · hoses · belts |
| N375 | Hard — General | 92 | 114 | 90 | Tread/carcass · high modulus |
| N550 | Soft — Semi-reinf. | 42 | 121 | 43 | Flexible goods · cable jackets |
| N660 | Soft — Semi-reinf. | 36 | 90 | 36 | Sidewalls · seals · inks |
| Parameter | Value |
|---|---|
| CAS Number | 1333-86-4 |
| Production Method | Furnace Black Process |
| Form | Pelleted / Granular |
| pH Range | 6.0 – 9.0 |
| Ash Content (max) | ≤ 0.45 % |
| Sulfur (max) | ≤ 1.1 % |
| Heating Loss @125°C | ≤ 1.0 % |
| Toluene Discolouration | ≥ 85 % |
| Classification | ASTM D1765 |
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