Tires
Choosing carbon black for tires means choosing a structural component, not a filler. Tread…
N660 Carbon Black Soft grade Origin: Iran
N660 Carbon Black
N660 carbon black has a lower surface area than N550 and a medium-low structure. It keeps good flexibility even at high hardness levels: the classic choice for carcass and sidewall compounds.
- HS Code
- 2803.00
- Minimum order
- 1 pallet
- Delivery terms
- EXW · FOB · CFR · CIF · DDP
With an iodine adsorption of 36 g/kg and a pour density of 440 kg/m³, N660 carbon black sits in the middle of the soft grades. Its most distinctive feature is that it keeps its flexibility even at high hardness levels.
Why sidewalls need N660
A tire sidewall bends and straightens with every wheel revolution. In a high-hysteresis compound, this continuous deformation generates heat and eventually initiates cracks. The low surface area of N660 limits heat build-up, while its medium-low structure provides the required stiffness.
Applications
Tire carcass plies, tire sidewalls, mechanical rubber goods.
Technical Specifications
| # | Property | Value | Unit |
|---|---|---|---|
| 01 | Iodine adsorption number ASTM D1510 | 36 ± 5 | g/kg |
| 02 | Oil absorption number (OAN) ASTM D2414 | 90 ± 5 | ml/100 g |
| 03 | Compressed oil absorption number (COAN) ASTM D3493 | 74 ± 5 | ml/100 g |
| 04 | Pour density ASTM D1513 | 440 ± 20 | kg/m³ |
| 05 | Heating loss (max) ASTM D1509 | 1 | % |
| 06 | Toluene discoloration (min) ASTM D1618 | 75 | % |
| 07 | pH ASTM D1512 | 7.5 – 9 | |
| 08 | Fines content — Q-Bag (max) ASTM D1508 | 7 | % |
| 09 | Fines content — bag (max) ASTM D1508 | 10 | % |
| 10 | Individual pellet hardness — single max (20 pellets) ASTM D5230 | 50 | cN |
| 11 | Individual pellet hardness — average (20 pellets) ASTM D5230 | 10 – 40 | cN |
| 12 | Sieve residue — No. 35 US Std (max) ASTM D1514 | 10 | ppm |
| 13 | Sieve residue — No. 325 US Std (max) ASTM D1514 | 1,000 | ppm |
| 14 | Ash content (max) ASTM D1506 | 0.75 | % |
| 15 | Sulfur content (max) ASTM D1619 | 2 | % |
| 16 | Nitrogen surface area (NSA) ASTM D6556 | 35 ± 5 | m²/g |
| 17 | External surface area (STSA) ASTM D6556 | 34 ± 5 | m²/g |
| 18 | Particle size | 49 – 60 | nm |
Values are manufacturer specifications; ± indicates the production tolerance. Every shipment is sent with a certificate of analysis (CoA) for that batch from an ISO/IEC 17025 accredited laboratory.
Packaging and Loading
| Packaging Type | Net Weight | Per Pallet | Container / Truck |
|---|---|---|---|
| Jumbo bag (PP-PE, double valve) | 1,000 kg | 1,000 kg | 20' FCL 10 pallets / 10,000 kg · 40' FCL 20 pallets / 20,000 kg · Truck 22 pallets / 22,000 kg |
| Two-ply kraft paper-PE bag | 25 kg | 1,375 kg | 20' FCL 11,000 kg · 40' FCL 22,000 kg · Truck 22,000 kg |
Certificates
Technical Data Sheet (TDS)Available on request
Safety Data Sheet (SDS)Available on request
- ISO 9001
- ISO 14001
- ISO 45001
- ISO/IEC 17025
Key Features
- Lower surface area than N550 — Lower heat build-up, longer fatigue life.
- Medium-low structure — High filler capacity.
- High modulus with adequate reinforcement — Sufficient stiffness in structural plies.
- Good flexibility at high hardness — Does not crack in continuously flexing layers such as sidewalls.
Industries Served
Industrial Rubber
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Trial program
How does it work?
1-pallet trial offer
Test the product and return it if you are not satisfied. No obligation.
Frequently Asked Questions About This Product
Why is N660 preferred in tire sidewalls?
A sidewall bends and straightens with every wheel revolution. The low surface area of N660 (35 m²/g) limits heat build-up, while its medium-low structure provides the required stiffness. This balance delays fatigue cracking.
What is the difference between N660 and N550?
N660 has a lower surface area (35 m²/g versus 40 for N550) and a lower structure (OAN 90 ml/100 g versus 121 for N550). Its pour density is higher (440 kg/m³). The result is lower heat build-up and higher filler capacity.
What packaging is N660 available in?
We offer two options: a 1,000 kg double-valve PP-PE jumbo bag and a 25 kg two-ply kraft paper-PE bag. A pallet of bags holds 1,375 kg of product; a 20' container takes 11,000 kg and a truck 22,000 kg. With jumbo bags, these figures are 10,000 kg and 22,000 kg respectively.
Does N660 come with a certificate of analysis and a safety data sheet?
Yes. Every shipment is sent with a certificate of analysis (CoA) for that batch, issued by an ISO/IEC 17025 accredited laboratory. We send the safety data sheet (SDS) on request; if you would like to see a sample report before ordering, you can ask for one through the quote form.