Views: 0 Author: Site Editor Publish Time: 2026-09-29 Origin: Site
Graphite is a crystalline material composed of stacked layers of carbon atoms held together only by weak van der Waals forces—much like a deck of playing cards that can easily slide against one another. In contrast, flexible graphite is produced by chemically expanding natural graphite and then compressing it into shape; this process creates a "spring-like structure" interspersed with gas molecules between the layers—resembling a puffed-up mille-feuille pastry—which allows the material to retain its layered nature while also exhibiting resilience and the ability to recover from deformation.
1. Density Difference: Ordinary graphite has a density of approximately 1.5–1.8 g/cm³, whereas flexible graphite is only 0.7–1.1 g/cm³.
2. Tensile Strength: Flexible graphite can reach 5–10 MPa, three times that of ordinary graphite.
3. Rebound Rate: Flexible graphite can recover 80% of its thickness after compression, while ordinary graphite is virtually inelastic.
4. Thermal Conductivity: Ordinary graphite has an axial thermal conductivity of 300 W/(m·K); due to its porous, loose structure, flexible graphite’s conductivity drops to 50 W/(m·K).
Ordinary graphite is suitable for applications requiring high thermal conductivity or rigid support, such as electrodes and crucibles. Thanks to its compressibility and sealing properties, flexible graphite is the material of choice for high-temperature gaskets, serving indispensable roles in areas like pipe flanges and engine seals. The two materials are akin to steel rebar and rubber bands; while both belong to the carbon material family, each excels in its own distinct arena.
