Applications of Flexible Graphite Sheets

Flexible graphite sheet serves as the base material for manufacturing various graphite composite sheets, tapes, packing materials, and gaskets. It exhibits excellent chemical stability and is compatible with media such as acids, alkalis, steam, solvents, and oils. It maintains its performance across a temperature range of -200°C to 650°C (in air) or -200°C to 3000°C (in non-oxidizing media) and can be used directly for sealing low-pressure applications such as flanges, sight glasses, water level gauges, and equipment covers.

To meet the rigorous demands of various sectors, specialized types of flexible graphite sheets have been developed: nuclear-grade sheets (e.g., GF-N type) feature high fixed-carbon content (≥99.5%) and are used in applications requiring exceptional sealing performance and material purity, such as the nuclear industry [6] [11]; oxidation-resistant sheets (e.g., GF-O type) offer higher operating temperature capabilities; low-sulfur, corrosion-resistant sheets (e.g., GF-S type) minimize corrosion on metal flanges by controlling sulfur content (e.g., to 800 ppm); and general-purpose industrial sealing sheets (e.g., GF-I type) are widely used in standard industrial settings.

In traditional industrial sectors, flexible graphite sheets and their reinforced variants (e.g., reinforced with thin stainless steel sheets or metal mesh) are critical static sealing materials. Due to their thermal stability, high strength, and resistance to cold flow, they are widely used to seal connections in pipeline flanges, valves, and pumps. Reinforced graphite sheets are ideal materials for manufacturing thermal gaskets, such as cylinder head gaskets for engines (including automotive engines).

With advancements in materials science, the application of flexible graphite sheets has expanded into emerging high-tech fields. Highly conductive flexible graphite sheets, produced via specialized processes, demonstrate significant potential in areas such as wearable electronics, flexible sensors, supercapacitors, electromagnetic interference (EMI) shielding, and antistatic films, thanks to their excellent electrical conductivity and mechanical flexibility.