Overview
Expanded graphite is produced by treating natural graphite flakes with intercalating agents (e.g., sulfuric acid) followed by rapid heating, causing volumetric expansion up to 300 times. This process creates a lightweight, porous structure while retaining graphite’s inherent conductivity and thermal stability. The enhanced version (增强膨胀石墨) often incorporates additives to improve mechanical strength or flame resistance. Primarily used in industrial applications, it bridges the gap between traditional graphite and synthetic materials. Its unique vermiform structure allows for flexibility, making it ideal for compression-molded products like gaskets. The material is also eco-friendly, as it is derived from natural graphite and recyclable.
Physical and Chemical Properties
Expanded graphite exhibits a low bulk density (0.002–0.03 g/cm³) and high surface area, enabling excellent adsorption capabilities. Its thermal conductivity ranges from 5–150 W/m·K, depending on compression, while electrical resistivity can be as low as 10–50 μΩ·m. The material is chemically inert to most acids, alkalis, and solvents, except strong oxidizers. A key advantage is its thermal stability, withstanding temperatures from -200°C to 3,000°C in inert atmospheres. The expansion ratio (typically 100–300 mL/g) directly influences properties like compressibility and sealing performance. Enhanced variants may include fire-retardant coatings or binders to augment specific functionalities.
Main Applications
In industrial sealing, expanded graphite is compression-molded into gaskets and packing materials for pumps/valves, offering leak-proof performance in harsh environments. Its thermal properties make it a preferred choice for heat sinks, furnace insulation, and battery thermal management systems. The automotive sector uses it for exhaust gaskets and flame barriers, while construction employs it in fire-resistant coatings and flexible graphite sheets. Recent innovations include its role in lithium-ion battery anodes and hydrogen storage composites due to its porous structure. Enhanced grades with added polymers or ceramics cater to specialized aerospace and defense needs.
Safety and Storage
While non-toxic, expanded graphite dust can irritate respiratory tracts; PPE like masks and goggles is recommended during handling. It is non-flammable but may react violently with strong oxidizers (e.g., perchlorates), necessitating segregated storage. Store in moisture-proof containers to prevent oxidation or absorption of contaminants. Bulk shipments should avoid compaction to preserve the material’s expansion ratio. Enhanced grades with additives may have specific storage requirements, such as protection from UV light or humidity, as specified by the manufacturer.
B2B Procurement Guide
Key specifications to evaluate include expansion ratio (affecting density/performance), sulfur content (critical for corrosion-sensitive applications), and particle size distribution (impacts moldability). For thermal uses, verify conductivity metrics under intended operating pressures. Supplier audits are advised to ensure consistent quality, as production methods (e.g., acid wash purity) vary. Pricing tiers depend on purity (≥99% for batteries), expansion volume, and customization (e.g., fire-retardant treatments). Sample testing for compression recovery and chemical resistance is recommended before large-scale procurement. Lead times may extend for tailored formulations.
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