Overview
Industrial grade graphite is a manufactured carbon material derived from petroleum coke or coal tar pitch through high-temperature processing (graphitization). Unlike natural graphite, it offers superior consistency in purity and microstructure, making it indispensable for precision industrial applications. Its layered atomic structure grants unique properties like anisotropy (direction-dependent behavior) and self-lubrication. The material is classified by purity, grain size, and density, with grades tailored for specific uses such as EDM electrodes or high-temperature crucibles.
Physical and Chemical Properties
Graphite exhibits exceptional thermal conductivity (3-5 times higher than steel) and electrical conductivity comparable to metals. Its thermal expansion coefficient is remarkably low, ensuring dimensional stability under extreme heat (up to 3000°C in inert atmospheres). Chemically, it resists most acids, alkalis, and organic solvents but oxidizes above 400°C in air. The material's compressive strength (20-100 MPa) and hardness (1-2 Mohs) vary with density and binder content. High-purity grades (<50 ppm ash) are essential for semiconductor and nuclear applications.
Main Applications
In metallurgy, graphite serves as electrodes for electric arc furnaces (EAF) and lining material for aluminum smelting cells. The electronics industry uses ultra-fine graphite for heat sinks, contacts, and battery anodes. Other critical uses include: EDM electrodes (uniform wear), aerospace components (lightweight thermal protection), and nuclear reactors (neutron moderator). Emerging applications include graphene production and fuel cell bipolar plates, where its conductivity and corrosion resistance are leveraged.
Safety and Storage
While non-toxic, graphite dust poses inhalation risks (possible pneumoconiosis) and explosion hazards in powder form. NFPA-rated dust collection systems are recommended for machining facilities. Store bulk graphite away from strong oxidizers (e.g., nitrates, peroxides) to prevent exothermic reactions. Moisture-sensitive grades require desiccant packaging. For transport, UN1325 (flammable solids) may apply to powdered forms exceeding 100 mesh size.
B2B Procurement Guide
Key specifications to verify: fixed carbon content (typically 99-99.99%), particle size distribution (10-500 microns for molded graphite), and flexural strength (critical for machining). For large orders, request mill test reports (MTR) with XRD purity analysis. Consider regional suppliers for graphite electrodes (China dominates 80% global production) but verify anti-dumping compliance. Just-in-time delivery is advisable to minimize storage degradation.
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