Overview
Isostatic graphite is a premium synthetic graphite manufactured through cold isostatic pressing (CIP) and sintering at temperatures exceeding 2500°C. Unlike extruded graphite, its isotropic structure ensures uniform physical and mechanical properties in all directions. This makes it indispensable for high-precision applications like semiconductor manufacturing and electrical discharge machining (EDM). The material's production involves compacting petroleum coke or pitch coke with a binder, followed by graphitization. Leading producers include Tokai Carbon (Japan), SGL Carbon (Germany), and Mersen (France), who adhere to strict quality standards like ISO 9001 for industrial-grade supply.
Physical and Chemical Properties
Isostatic graphite exhibits exceptional thermal conductivity (70–120 W/m·K) and low thermal expansion (4–6 × 10⁻⁶/K), enabling stability under rapid temperature changes. Its electrical resistivity ranges from 8–15 μΩ·m, making it suitable for electrodes. The material's compressive strength (70–150 MPa) surpasses conventional graphite due to its homogeneous density. Chemically, it resists acids (except strong oxidizers like nitric acid) and operates in inert atmospheres up to 3000°C. Typical ash content is <500 ppm for high-purity grades, critical for semiconductor applications where metal contamination must be minimized.
Main Applications
In the semiconductor industry, isostatic graphite serves as crucibles for silicon crystal growth and components in CVD reactors. Its thermal shock resistance ensures longevity in solar cell production furnaces. EDM electrodes benefit from its uniform wear and fine surface finish (Ra <1 μm). Nuclear reactors use it as moderators due to neutron absorption resistance. Emerging applications include lithium-ion battery anodes and aerospace thermal management systems. The photovoltaic sector consumes ~30% of global production, driven by demand for monocrystalline silicon.
Safety and Storage
While non-toxic, graphite dust poses inhalation risks (PEL: 15 mg/m³ for particulates). Machining requires local exhaust ventilation and NIOSH-approved respirators. Store blocks in moisture-free environments to prevent cracking; smaller pieces should be sealed in plastic to minimize oxidation. Fire hazards are low (autoignition: ~650°C), but burning graphite requires Class D extinguishers. Transport classifications typically fall under UN non-regulated for solid forms. MSDS sheets should be reviewed for specific handling protocols.
B2B Procurement Guide
Key specifications to verify include: bulk density (1.8+ g/cm³ for high-strength grades), flexural strength (>40 MPa), and particle size (<20 μm for fine-grain). For EDM, request resistivity and electrode wear ratio data. Semiconductor buyers should demand certificates for trace metals (Fe, Ni, Ca <5 ppm each). Lead times range from 8–12 weeks for custom sizes. Consider regional suppliers like GrafTech (Americas) or Nippon Carbon (Asia) to reduce logistics costs. MOQs often start at 100 kg, with price breaks at tonnage quantities. Always request mill test reports for critical applications.
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