iSTAR NATURAL GRAPHITE
Natural flake graphite has been extensively used in refractories to boost performance and service life. Natural graphite is still a vital component of modern refractory products and a prime choice for new developments. Refractories in steel ladles, basic oxygen furnaces (BOF), electric arc furnaces (EAF), and induction furnaces where iSTAR Natural Graphite can contribute to smooth, economical, and trouble-free operation.
iSTAR Natural Graphite® powders offer high thermal conductivity and oxidation resistance, effectively improving corrosion and thermal shock resistance by repelling infiltration and lowering internal thermal gradients.
iSTAR Natural Graphite: Properties and Effects on Refractories:
1. Thermal Shock Resistance : iSTAR Natural Graphite® has excellent thermal conductivity. When added to refractories, it significantly reduces the internal thermal gradient between the hot and cold faces. This effectively decreases internal stresses and improves thermal shock and spalling resistance.
2. Corrosion Resistance : iSTAR Natural Graphite® prevents penetration of slag and molten metal through the crack network inside the refractory by being non-wetted by molten slag. This characteristic effectively improves the corrosion resistance of the refractory materials.
3. Oxidation Resistance: Research work indicates that 2 factors directly affect the oxidation resistance: particle size and purity. It has been determined that oxidation begins on the edges of the graphite flakes and where impurities or inclusions can be found. Larger and purer flakes are therefore more resistant. With larger flake size, higher thickness, and higher purity, iSTAR Natural Graphite® shows excellent resistance to oxidation, and this translates into longer refractory life.
ADDITIONAL PROPERTIES AND ADDED BENEFITS iSTAR NATURAL GRAPHITE:
- Outstanding resistance to chemical attacks.
- Stability over a wide range of temperatures with a very low thermal expansion coefficient.
- Reduced tool wear during pressing because of its unique lubricant action.
- Malleable and very easy to model into shape.
iSTAR Natural Flake Graphite is sold in a wide range of products distinguished by particle size distribution, chemistry, and carbon content. iSTAR Carbon mines the graphite from its own source in Tanzania, Africa. We guarantee very fast and reliable deliveries. Our natural graphite is thoroughly controlled in our laboratories to ensure quality, consistency, and above all, total customer satisfaction.
Specification:
| Class | Particle Size | Guaranteed | Carbon Content |
| Coarse | 20*50 mesh | 80% min. +50 mesh (300 µm) | 80% - 97% |
| Medium | 50*80 mesh | 80% min. +80 mesh (180 µm) | 80% - 97% |
| Medium | 50*100 mesh | 80% min. +100 mesh (150 µm) | 80% - 97% |
| Medium | 80*150 mesh | 80% min. +140 mesh (105 µm) | 80% - 97% |
| Fines | -100 mesh | 80% min. +100 mesh (150 µm) | 80% - 97% |
| Fines | -150 mesh | 80% min. +150 mesh (105 µm) | 80% - 97% |
| Fines | -200 mesh | 80% min. +250 mesh (105 µm) | 80% - 97% |
At iSTAR, we are solution providers for refractory manufacturers, paint and coating industries, foundries, and carbon product manufacturers. Our extensive network of plants, traders, and small manufacturing units spans Asia, Europe, the Middle East, Africa, and beyond. Through our channel partners in strategic global locations, we offer the highest quality products and services to a wide range of industries.
