Graphite material

When evaluating graphite, you must prioritize Fixed Carbon Content, which should typically be above 90% for industrial grades and 99.9%+ for high-purity applications. Other critical metrics include Particle Size Distribution (D50), Ash Content (lower is better for conductivity), and Specific Surface Area (BET). For synthetic graphite, verify the Graphitization Degree to ensure optimal thermal and electrical conductivity.

Natural Flake Graphite is preferred for its excellent lubricity and cost-effectiveness in refractories and batteries. In contrast, Synthetic Graphite offers higher purity, superior consistency, and better longevity in high-temperature environments like EDM electrodes or semiconductor manufacturing. Choose based on whether your priority is raw material cost (Natural) or performance stability (Synthetic).

Suppliers should provide ISO 9001:2015 for quality management. For specialized industries, look for REACH compliance (EU market) and RoHS certification to ensure the absence of hazardous heavy metals. If sourcing for the battery industry, verify if the supplier adheres to IATF 16949 standards for automotive supply chain quality.

Request a Certificate of Analysis (COA) for each batch. Conduct third-party testing for Tap Density and Electrical Resistivity. For flake graphite, perform a sieve analysis to confirm the flake size distribution matches your requirements. A Scanning Electron Microscope (SEM) image is also recommended to verify the morphology and surface integrity of the particles.

The most significant risks include moisture absorption during sea transit, which can degrade material performance, and fluctuations in export tax policies. Graphite is often classified as a strategic mineral, so ensure the supplier has a valid Export License to avoid customs seizures. Always use moisture-proof ton bags or vacuum packaging for long-distance shipping.

Negotiate based on volume-tiered pricing; typically, orders exceeding 5-10 metric tons qualify for significant discounts. Request FOB (Free On Board) terms to maintain control over shipping costs, but ensure the supplier handles the domestic export clearance. For new suppliers, insist on Trade Assurance or Letter of Credit (L/C) to secure the transaction until quality is verified.

Graphite powder is highly conductive and can cause short circuits if it leaks into electrical systems. Ensure the cargo is labeled as 'Non-Hazardous' (if applicable) but packed in double-layered reinforced bags to prevent leakage. For air freight, check if a DGM (Dangerous Goods Management) report is required, even if the material is technically non-flammable.