Part 1: Product Overview
Flake graphite is a representative form of natural crystalline graphite, named for its fish-scale-like appearance. It belongs to the hexagonal crystal system with a typical layered structure. Composed of carbon, it is one of the three natural allotropes of carbon (the other two being diamond and coal), and is mainly found in metamorphic rock deposits.
Our flake graphite products are made from high-quality graphite ore through flotation, purification, pulverization, classification and other refining processes. They feature complete crystallization, thin flakes with good toughness, and excellent physical and chemical properties.
According to fixed carbon content, the products are divided into four series:
- High-purity graphite: ≥99.9%
- High-carbon graphite: 94%–99%
- Medium-carbon graphite: 80%–93%
- Low-carbon graphite: 50%–75%
Particle size is adjustable from 1 μm to 500 μm.
Core Value of Flake Graphite
As one of the non-metallic materials with the best electrical and thermal conductivity in nature, flake graphite has become an irreplaceable strategic non-metallic mineral in modern industry - ranging from basic refractory materials to cutting-edge new energy fields - thanks to its outstanding high-temperature resistance, self-lubrication and chemical stability.
Part 2: Core Advantages and Characteristics
Ultra-high Temperature Resistance & Stable Performance
Melting point reaches 3650 °C, making it one of the most heat-resistant materials known. It works stably for a long time in an inert atmosphere, serving as an ideal basic raw material for high-temperature refractories.
Excellent Electrical & Thermal Conductivity
It ranks first in electrical conductivity among non-metallic materials. Its thermal conductivity is comparable to copper and silver, much higher than ordinary metals. Suitable for heat dissipation, conduction and other special functional fields.
Excellent Self-lubricating Property
Extremely low friction coefficient with natural self-lubricating characteristics. It can operate for a long time under oil-free conditions, ideal for mechanical lubrication and friction materials.
Excellent Thermal Shock Resistance
Low coefficient of thermal expansion and good thermal shock resistance; can withstand severe temperature changes without cracking.
Chemical Inertia & Corrosion Resistance
Chemically stable, insoluble in acids and alkalis, with good acid and alkali corrosion resistance.
Good Plasticity
Excellent plasticity, can be processed into products of various complex shapes.
Graded by Purity & Complete Specifications
|
High-purity graphite |
Carbon content ≥99.9%, for high-end and precision fields |
|
High-carbon graphite |
Carbon content 94%–99%, for high-end industry |
|
Medium-carbon graphite |
Carbon content 80%–93%, general-purpose products |
|
Low-carbon graphite |
Carbon content 50%–75%, for basic applications |
Core Indicators of Flake Graphite (Reference: GB/T 3518-2008)
|
Item |
Unit |
Index Range |
|
Fixed carbon content |
% |
50–99.995 (adjustable) |
|
Volatile matter |
% |
≤0.8–1.8 |
|
Moisture |
% |
≤0.2–0.5 |
|
Particle size range |
μm |
1–500 |
|
Melting point |
°C |
3650 |
|
Density |
g/cm³ |
2.2–2.3 |
Note: Actual indicators shall be subject to the product inspection report.
Part 3: Main Application Fields
With its unique layered structure, excellent high-temperature resistance, electrical and thermal conductivity, and self-lubrication, flake graphite is widely used in more than 30 fields from traditional industry to cutting-edge technology.
1. Metallurgical & Refractory Industry (Traditional Core Application)
The refractoriness of flake graphite is positively correlated with carbon content. High-carbon or high-purity flake graphite after purification can be directly or indirectly used in refractory products.
Main Applications:
Magnesia-carbon bricks: Composite with other metals for high-temperature linings of steel converters, electric furnaces, ladles, etc.
Graphite crucibles: Directly used for smelting non-ferrous metals and precious metals.
Refractory bricks: Production of various refractory bricks.
Fire-resistant metal sheets & graphite composite panels: Special fireproof sheets.
Carburant for steelmaking: To increase carbon content in steel.
2. New Energy & Battery Industry (Fastest-growing Field)
With the explosive growth of new energy vehicles and energy storage, flake graphite plays an increasingly important role in new energy.
Main Applications:
Anode material for lithium-ion batteries: High-purity flake graphite is the core raw material. Purity can be raised above 99.99% via high-temperature purification (above 2800 °C).
Battery electrodes: Electrode materials for various batteries.
Alkaline & lead-acid batteries: Conductive additives.
Fuel cells: Bipolar plates and other components.
3. Electrical Industry
Main Applications:
Carbon brushes: Core material for motor and generator carbon brushes.
Brush rods & carbon sticks: Conductive components.
Conductive coatings: Deep-processed conductive coatings.
Electrical components: Conductive parts for various electrical equipment.
4. Machinery & Lubrication
Main Applications:
Solid lubricant: For various mechanical lubrication systems.
Graphite emulsion: Used as lubricant, release agent, drawing agent, etc.
Friction materials: Brake pads, clutch facings, etc.
Sealing materials: Graphite sealing rings and components.
5. Sealing Materials & Flexible Graphite
Flake graphite can be made into expandable graphite via chemical or high-temperature treatment, and further processed into flexible graphite products.
Main Applications:
Expandable graphite: Raw material for flexible graphite products.
Flexible graphite seals: High-temperature, corrosion-resistant gaskets and packing.
Flexible graphite composites: Various special sealing materials.
6. Cutting-edge Technology & New Materials
Main Applications:
Raw material for graphene production: Prepared via liquid-phase exfoliation or redox methods.
Special ceramics: Conductive, antistatic and other functional ceramics.
Semiconductor materials: For special semiconductor devices.
Thermal conductive composites: Thermal filler in plastics and rubbers to improve thermal management.
7. Chemical Industry
Main Applications:
Catalyst carrier for fertilizer industry.
Chemical anti-corrosion materials.
Conductive polymers: Functional polymer materials.
8. Light Industry & Daily Products
Main Applications:
Pencil leads: Main component of traditional pencil leads.
Coatings: Special functional coatings.
Paints: Conductive, anti-corrosion and other functional paints.
9. Military & National Defense Industry
Main Applications:
Stabilizer for explosive materials.
Special components for military equipment.
Nuclear industry: Graphite moderator and reflector materials.
10. Other Applications
Desulfurization accelerator in smelting.
Rubber & plastic additives: Improve high-temperature resistance and wear resistance.
EPS insulation boards: Enhance thermal and electrical conductivity.
Corrosion-resistant components for chemical industry.
Part 4: Product Classification & Technical Parameters
Classification by Fixed Carbon Content
|
Product Type |
Fixed Carbon Content |
Main Applications |
|
High-purity graphite |
≥99.9% |
Lithium battery anodes, nuclear industry, semiconductors, high-end sealing |
|
High-carbon graphite |
94%–99% |
Magnesia-carbon bricks, crucibles, carbon brushes, conductive coatings |
|
Medium-carbon graphite |
80%–93% |
Refractories, lubricants, pencil leads, general industrial fillers |
|
Low-carbon graphite |
50%–75% |
Steelmaking carburant, basic metallurgical raw materials |
Classification by Particle Size
|
Model |
Particle Size |
Main Features |
Typical Applications |
|
-190 to -198 series |
Coarse >100 mesh |
Large flakes, complete crystallization |
Expandable graphite, flexible seals, magnesia-carbon bricks |
|
-100 mesh, -200 mesh |
Fine powder |
Sieve passage >80% |
Lubricants, coatings, rubber fillers |
|
Micronized graphite |
<38 μm |
Ultra-fine powder |
Lithium battery anodes, conductive pastes |
|
325-mesh high-purity |
~44 μm (325 mesh) |
Purity ≥99.6% |
Graphene production, special functional materials |
Technical Specifications (Enterprise Standard – Series -198)
|
Grade |
Fixed Carbon ≥ /% |
Volatile Matter ≤ /% |
Moisture ≤ /% |
100-mesh Residue ≥ /% |
|
-198 |
98.00 |
0.8 |
0.20 |
10.00 |
|
-197 |
97.00 |
0.9 |
0.20 |
10.00 |
|
-196 |
96.00 |
1.0 |
0.20 |
10.00 |
|
-195 |
95.00 |
1.10 |
0.20 |
10.00 |
|
-194 |
94.00 |
1.20 |
0.20 |
10.00 |
|
-193 |
93.00 |
1.40 |
0.20 |
10.00 |
|
-192 |
92.00 |
1.50 |
0.20 |
10.00 |
|
-191 |
91.00 |
1.50 |
0.20 |
10.00 |
|
-190 |
90.00 |
1.80 |
0.20 |
10.00 |
High-purity Flake Graphite (325 Mesh)
|
Item |
Index |
|
Particle size |
325 mesh |
|
Purity |
≥99.6 wt% |
|
CAS No. |
7782-42-5 |
|
Appearance |
Black flaky powder |
Physical Properties
|
Item |
Index |
|
Color |
Blackish gray |
|
Melting point |
3650 °C |
|
Density |
approx. 2.2–2.3 g/cm³ |
|
Friction coefficient |
Extremely low (self-lubricating) |
|
Electrical conductivity |
Highest among non-metallic materials |
|
Thermal conductivity |
Comparable to copper and silver |
|
Thermal expansion coefficient |
Low |
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