Carbon Black (N330, Conductive Grade)
Key Features
- Broad UV absorption — most effective UV stabilizer for black composites (0.5–2 phr)
- Electrical conductivity via percolation network — antistatic at 5–15 phr
- Reinforcing effect: high surface area and structured aggregates improve modulus
- Jet black color and opacity in all thermoset resin systems
- Multifunctional: UV protection + conductivity + reinforcement in single additive
Carbon black N330 is a furnace-grade carbon black widely used as a reinforcing filler, UV stabilizer, and conductivity additive in composite resin systems. With a primary particle diameter of approximately 28 nm and a DBP absorption of ~102 mL/100g (moderate structure), N330 provides an excellent balance between reinforcing efficiency, dispersibility, and electrical conductivity in thermoset systems.
In composites, carbon black serves multiple functions simultaneously. Its UV absorption across the full solar spectrum makes it the most cost-effective UV stabilizer for composites exposed to outdoor weathering — at loadings as low as 0.5–1.5 phr, carbon black prevents UV-induced chain degradation, surface chalking, and discoloration. At higher loadings (5–25 phr), carbon black provides significant electrical conductivity through percolation networks, enabling the formulation of antistatic and electrostatically dissipative (ESD) composite parts and coatings.
As a reinforcing filler, carbon black improves tensile and flexural modulus in both thermoset and thermoplastic composites through its high specific surface area (~80 m²/g) and structured aggregate morphology. It also contributes to improved fatigue life and crack resistance. The jet-black color makes carbon-black-filled composites a popular choice for industrial, infrastructure, and automotive applications where black color is required by design. Requires intensive mixing (high-shear dissolver or triple-roll mill) for proper dispersion.
Specifications
| Parameter | Value |
|---|---|
| Ash content | ≤ 0.5% |
| DBP absorption | 95–110 mL/100g |
| Toluene extract | ≤ 0.1% |
| BET surface area | 78–88 m²/g |
| Moisture content | ≤ 0.5% |
| Grade designation | N330 (Furnace Black) |
| STSA surface area | 75–85 m²/g |
| Bulk density (tapped) | 350–450 kg/m³ |
| Primary particle size (TEM) | ~28 nm |
Applications
FAQ
Antistatic (surface resistance 10⁶–10⁹ Ω): typically 3–8 phr N330 in epoxy or UPR. Electrostatic dissipative (ESD, 10⁴–10⁶ Ω): 8–15 phr. Electrically conductive (floor heating, grounding, <10³ Ω): 15–30 phr. The actual percolation threshold depends heavily on dispersion quality — poor dispersion raises the effective threshold and can produce inconsistent conductivity. Higher structure carbon blacks (N110, acetylene black) achieve conductivity at lower loading.
Direct Contact
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