What is Expandable Graphite?

Expandable Graphite is a modified form of natural graphite that expands when exposed to heat, making it a crucial material for flame retardants, energy storage, gaskets, sealing materials, and thermal management applications. It offers high thermal conductivity, chemical stability, and superior flame-resistant properties.

Chemical Properties and CAS Number

• Chemical Formula: C
• CAS Number: 7782-42-5
• Appearance: Black fine powder or flakes
• Density: ~1.9-2.3 g/cm³
• Expansion Ratio: Varies (100-400 times original volume)
• Solubility: Insoluble in water, dispersible in some solvents
• Chemical Stability: High oxidation resistance, excellent thermal shock resistance

Applications of Expandable Graphite

1. Flame Retardants & Fireproofing Materials

Used in fire-resistant coatings, insulation panels, and composite materials due to its expansion and heat-insulating properties.

2. Energy Storage & Battery Technology

Applied in lithium-ion batteries, supercapacitors, and conductive pastes for enhanced conductivity and energy efficiency.

3. Sealing & Gasket Materials

Employed in gaskets, seals, and flexible graphite sheets for heat resistance and chemical durability.

4. Thermal Management & Heat Dissipation

Utilized in thermal interface materials, heat spreaders, and phase change materials (PCM) for superior cooling performance.

5. Polymer Composites & Lightweight Structures

Integrated into plastics, coatings, and structural reinforcements to enhance mechanical strength and conductivity.

6. Water Purification & Environmental Applications

Used in adsorption materials, heavy metal removal, and filtration membranes due to its high surface area and reactivity.

Pricing of Expandable Graphite

Prices vary based on expansion ratio, particle size, and purity:

• Industrial Grade: Typically ranges from $3 – $10 per kilogram
• High-Purity/Specialized Grade: Prices range from $15 – $50 per kilogram, used in batteries, flame retardants, and energy storage.

Factors Influencing Expandable Graphite Prices

• Expansion ratio and particle size
• Bulk order volume and processing method
• Industry demand for flame retardants and energy storage
• Functionalization and surface modifications

Conclusion

Expandable Graphite is a high-performance material used in flame retardants, energy storage, thermal management, and sealing applications. Its heat resistance, expansion capability, and conductivity make it essential for advanced industrial and environmental applications. Pricing depends on purity, processing, and application requirements.