Overview
High purity graphite paper is manufactured through chemical expansion and compression of natural graphite flakes, achieving over 99.9% carbon content. Unlike conventional graphite, its layered structure provides exceptional flexibility while maintaining the material's intrinsic thermal and electrical properties. This engineered material bridges the gap between rigid graphite blocks and soft graphite foils, offering unique advantages in applications requiring both conformability and performance. The production process eliminates impurities like sulfur and metals, making it suitable for sensitive electronic and chemical environments.
Physical and Chemical Properties
The material exhibits anisotropic thermal conductivity (150-400 W/mK in-plane), with electrical resistivity ranging from 5-20 μΩ·m. Its porosity can be controlled during manufacturing, affecting density and compressibility (typically 15-25% under load). Chemically inert, it resists most acids, alkalis, and solvents except strong oxidizing agents. The operating temperature range spans from -200°C to 3000°C in inert atmospheres. Unlike metals, it demonstrates excellent thermal shock resistance due to low CTE (coefficient of thermal expansion).
Main Applications
In electronics, it serves as heat spreaders for CPUs and LED modules, replacing aluminum in weight-sensitive applications. The aerospace industry utilizes it for rocket nozzle gaskets and thermal insulation due to its lightweight stability. Energy applications include fuel cell bipolar plates and lithium-ion battery current collectors. Emerging uses encompass flexible heaters and EMI shielding in 5G devices. The medical field employs sterilizable graphite paper for equipment seals in autoclaves.
Safety and Storage
While non-toxic, machining generates fine graphite dust requiring OSHA-compliant ventilation (PEL 15 mg/m³ total dust). Store rolls flat in polyethylene-lined boxes to prevent creasing and moisture absorption. Fire risks are minimal (autoignition temperature >750°C), but contact with strong oxidizers like nitric acid must be avoided. For cleanroom applications, specify vacuum-sealed packaging with particulate testing reports.
B2B Procurement Guide
Key specifications include: purity (standard 99.9% or ultra-high 99.99%), thickness tolerance (±5% typical), and tensile strength (5-20 MPa machine direction). Request mill certificates with sulfur (<50ppm) and chloride (<10ppm) content analysis. For thermal interface applications, verify through-plane thermal resistance data. Bulk purchases (100+ rolls) typically secure 15-30% discounts. Lead times range from 4-8 weeks for custom grades, with ISO 9001-certified suppliers preferred for consistent quality.
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