| Large-Flake Graphite Powder |
+50 to 0 mesh
(approximately 300–150 µm) |
94–99.5% |
0.5–6% |
≤0.5% |
High crystallinity, strong lubricity, good thermal and electrical conductivity, and relatively high aspect ratio. |
Refractory additives, crucibles, foundry coatings, conductive compounds, thermal-management formulations, and expandable graphite feedstock. |
Verify flake-size distribution, expansion capability if used for expandable graphite, acid resistance, ash composition, and packing behavior. |
| Medium-Flake Graphite Powder |
50 to 100 mesh
(approximately 150–75 µm) |
90–99% |
1–10% |
≤0.8% |
Balanced conductivity, lubricity, surface area, and cost; suitable for general-purpose formulations. |
Refractory mixes, brake and friction materials, conductive coatings, lubricants, batteries, and powder-metallurgy blends. |
Compare fixed carbon on a consistent basis, preferably dry basis; check particle morphology, iron content, and compatibility with the binder system. |
| Fine-Flake Graphite Powder |
100 to 325 mesh
(approximately 75–45 µm) |
85–99% |
1–15% |
≤1.0% |
More uniform dispersion and higher surface area than coarse flake; generally easier to blend into coatings and polymer systems. |
Conductive paints, polymer composites, lubricating coatings, friction materials, seals, and fine refractory formulations. |
Check agglomeration, dispersion time, viscosity impact, specific surface area, and the amount of non-carbon mineral matter. |
| Micronized Natural Graphite |
D50 approximately 5–25 µm |
90–99.5% |
0.5–10% |
≤1.0% |
Fine particle size, high surface area, and improved consistency in thin films, lubricants, and polymer dispersions. |
Water- or solvent-based coatings, conductive inks, dry-film lubricants, engineering plastics, and specialty friction formulations. |
Request D10/D50/D90 data, laser-diffraction test conditions, surface-area data, dispersibility results, and dust-handling information. |
| High-Purity Natural Graphite |
Commonly 100 to 325 mesh or micronized |
≥99.5% carbon |
≤0.5% |
≤0.5% |
Low mineral impurity level and more stable electrical, thermal, and chemical performance. |
Specialty refractories, high-temperature components, precision lubricants, conductive materials, and selected energy-storage formulations. |
Check individual impurity limits, especially iron, sulfur, silicon, calcium, and heavy metals; also confirm the analytical method and detection limits. |
| Battery-Oriented Natural Graphite Feedstock |
Often processed toward approximately 10–20 µm before shaping and coating |
Typically ≥99.5% after purification |
Typically ≤0.5% after purification |
Usually ≤0.5% |
Requires controlled particle morphology, low impurity content, suitable crystallinity, and consistent electrochemical performance. |
Anode-material development and other applications requiring graphitizable, high-purity carbon feedstock. |
Do not select by carbon percentage alone; evaluate particle-size distribution, tap density, specific surface area, impurity profile, morphology, first-cycle efficiency, and cycle-life test data. |
| Expandable-Graphite Feedstock |
Commonly 20 to 80 mesh
(approximately 850–180 µm) |
90–99% |
1–10% |
≤1.0% |
Flake structure is treated with intercalation compounds so that it expands when heated. |
Intumescent fire-resistant coatings, fire-stop materials, thermal barriers, seals, and flexible graphite production. |
Specify expansion volume, expansion onset temperature, acid content, flake-size distribution, residual moisture, and post-treatment stability. |
| Refractory-Grade Natural Graphite |
Typically 50 to 200 mesh, depending on the formulation |
85–99% |
1–15% |
≤1.0% |
Good thermal-shock resistance, low wettability by many molten materials, and useful thermal conductivity. |
Magnesia-carbon bricks, alumina-carbon products, crucibles, continuous-casting components, and foundry coatings. |
Match flake size to the matrix, check sulfur and metal impurities, evaluate oxidation resistance, and test thermal-shock behavior in the finished formulation. |
| Lubricant-Grade Natural Graphite |
Usually 200 mesh to micronized grades |
90–99.5% |
0.5–10% |
≤1.0% |
Layered crystal structure provides low shear strength and solid-film lubricating behavior, especially under high loads or temperatures. |
Dry lubricants, anti-seize compounds, lock lubricants, metal-forming products, and high-temperature sliding interfaces. |
Test coefficient of friction, wear rate, oil absorption, dispersion stability, particle size, and compatibility with oils, resins, or other additives. |
| Conductive-Grade Natural Graphite |
Commonly 200 mesh to D50 approximately 10–30 µm |
95–99.5% |
0.5–5% |
≤1.0% |
Provides electrical pathways when sufficiently loaded and dispersed within a polymer, coating, adhesive, or cementitious matrix. |
Conductive coatings, antistatic compounds, electromagnetic-shielding materials, heating elements, and conductive plastics. |
Measure volume resistivity at the intended loading, check percolation behavior, dispersion quality, moisture sensitivity, and binder compatibility. |
| Low-Sulfur Natural Graphite |
Available from coarse flake to micronized grades |
Typically ≥95% |
Typically ≤5% |
≤0.5–1.0% |
Reduced sulfur helps limit odor, gas release, corrosion risk, and unwanted reactions during heating or processing. |
High-temperature refractories, foundry applications, metallurgical additives, and formulations sensitive to sulfur emissions. |
Specify total sulfur and sulfur species, test at the intended processing temperature, and confirm limits for iron, moisture, and volatile matter. |
