The Furnace Black method creates Carbon Black with primary particle sizes ranging from 10 to 80 nm. The primary particle size is mentioned to indicate the application properties of a given product. Free primary particles do not exist as they are strongly fused together and form so-called aggregates.
The key parameters of furnace black are in Table 1.
Table 1 - Furnace black variance.
| Nitrogen Surface Areaa |
m2/g |
15-450 |
| Iodine Adsorptionb |
mg/g |
15-450 |
| Primary Particle Size |
nm |
10-80 |
| OANc |
ml/100g |
40-200 |
| Jetness Myd |
- |
210-300 |
| Tint Strengthe |
% |
50-160 |
| Volatile Matterf |
% |
0.5-6 |
| pH**g |
- |
6-10 |
a) ISO 4652/18852, ASTM D6556, DIN 6613. b) ISO 1304, ASTM D1510. c) ISO 4656, ASTM D2414. d) DIN 55979. e) ISO 5435, ASTM D3265. f) DIN 53552. g) ISO 787/9, ASTM D1512.
Fig. 1 shows the primary particle size distribution curve for sevral production methods including furnace black.
Figure 1 - Distribution curves for primary particle diameters

Source: Orion, What is Carbon Black? Brochure.