Overview
Expanded graphite is produced by treating natural graphite flakes with acids or oxidizers, followed by rapid heating to create a low-density, porous structure. The '30' in '30膨胀石墨' typically refers to its expansion ratio (30 times original volume). This material retains graphite's inherent conductivity while gaining flexibility and adsorption capabilities. Unlike conventional graphite, expanded graphite has a vermicular (worm-like) morphology, making it ideal for compression into sheets or composites. Its unique structure enables applications ranging from industrial sealing to advanced thermal management solutions.
Physical and Chemical Properties
Expanded graphite exhibits exceptional thermal stability, withstanding temperatures up to 600°C in air and 3,000°C in inert atmospheres. Its electrical conductivity ranges from 10,000–30,000 S/m, though lower than raw graphite due to porosity. The material is chemically inert to most solvents but can react with strong oxidizers. The expansion process creates a high surface area (5–50 m²/g), enhancing its adsorption capacity for oils or gases. Its compressibility allows it to form resilient seals under pressure, while maintaining low gas permeability—a critical feature for gasket applications.
Main Applications
In industrial settings, expanded graphite is widely used for high-temperature gaskets and packing materials, especially in chemical processing equipment. Its flame-retardant properties make it a key component in firestop systems and intumescent coatings for construction. The material also serves in thermal interface materials (TIMs) for electronics cooling, leveraging its anisotropic conductivity. Emerging uses include battery electrodes (e.g., lithium-ion anodes) and hydrogen storage composites, where its porous structure benefits ion or gas diffusion.
Safety and Storage
While expanded graphite is non-toxic, its fine particles may cause respiratory irritation if inhaled. Use dust masks and ventilation during handling. Storage requires dry conditions to prevent moisture absorption, which can reduce expansion efficiency. Fire risks are minimal due to graphite's inherent flame resistance, but contact with strong oxidizers (e.g., perchlorates) should be avoided. Spills can be swept up without special precautions, though electrostatic discharge should be controlled in sensitive environments.
B2B Procurement Guide
When sourcing expanded graphite, specify parameters like expansion ratio (e.g., 30×), particle size (typically 80–300 mesh), and sulfur content (<1,000 ppm for sensitive applications). Industrial-grade material should have ≥98% carbon purity. Bulk pricing often applies above 100 kg, with discounts for long-term contracts. Verify supplier certifications (ISO 9001) and request technical data sheets (TDS) for thermal/mechanical properties. Consider regional logistics—material density affects shipping costs significantly.
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