Overview
Wear-resistant flake graphite is a naturally occurring or synthetically enhanced form of graphite characterized by its layered structure and exceptional durability against mechanical wear. Unlike amorphous graphite, its flake morphology provides superior lubrication properties and anisotropic thermal conductivity, making it indispensable in high-stress industrial environments. The material undergoes specialized processing (e.g., acid washing, thermal treatment) to enhance its abrasion resistance. It typically contains 90-99% fixed carbon, with performance graded by flake size (e.g., +80 mesh for high-density applications).
Physical and Chemical Properties
The material exhibits a hexagonal crystal lattice that facilitates easy shear between layers, granting self-lubricating capabilities. Its thermal conductivity ranges from 150-400 W/mK parallel to the basal plane, while electrical resistivity stays low (5-10 μΩ·m). Chemically, it resists most acids (except strong oxidizers like nitric acid) and maintains stability up to 500°C in air (higher in inert atmospheres). The Mohs hardness is 1-2, but its wear resistance stems from flake interlocking rather than hardness.
Main Applications
Primary use is in friction materials (60% of demand), including brake pads and clutch facings, where graphite reduces noise and wear. In metallurgy, it serves as a mold coating for continuous casting, preventing steel adherence. Other applications include conductive fillers in batteries, high-temperature gaskets for chemical reactors, and dry lubricants for machinery operating in vacuum or extreme temperatures. Recent innovations employ it in graphene production due to its structural regularity.
Safety and Storage
Graphite dust poses a moderate inhalation risk (classified as a nuisance particulate). NFPA recommends using local exhaust ventilation and NIOSH-approved respirators during bulk handling. Storage areas should avoid humidity to prevent caking. Unlike some synthetic grades, natural flake graphite is not classified as hazardous under OSHA or GHS. However, electrostatic charges may accumulate during transport—ground containers during filling/emptying. Bulk shipments typically use moisture-proof bags or super sacks.
B2B Procurement Guide
Key specifications to request: flake size distribution (e.g., 80% +100 mesh), ash content (<1.5% for premium grades), and volatile matter (<0.5%). For wear-critical uses, ask for pin-on-disk test results showing coefficient of friction (<0.2 ideal) and wear rate. Major producers are in China (70% of global supply), Madagascar, and Brazil. Verify suppliers provide XRD analysis to confirm crystallinity. Containerized shipments (20-25 MT per 20' container) are common, with lead times of 4-8 weeks for overseas orders. Consider FOB prices for large volumes (>50 tons).
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