PRODUCT SPECIFICATIONS AND DETAILS
Expandable Graphite
Expandable Graphite is a specially processed graphite material, typically produced from natural flake graphite through intercalation treatment. Before heating, it is supplied in flake form. When exposed to elevated temperatures, it rapidly expands along the c-axis of the graphite crystal structure and forms a voluminous worm-like carbon structure. This expansion behavior makes Expandable Graphite a highly functional material for flame-retardant systems, sealing materials, graphite foil production, fire protection products, and selected industrial processing applications.
Compared with ordinary graphite powder, Expandable Graphite offers a unique intumescent effect under heat, allowing it to form an insulating and protective char layer. This property makes it especially suitable for halogen-free flame-retardant formulations, fire protection materials, sealing systems, graphite foil production, specialty coatings, composite materials, and selected advanced carbon-based applications. At QDZRT, suitable grades can be supplied according to particle size, expansion volume, sulfur content, treatment level, and end-use requirements.
Key Features
- Supplied in flake form before heating and expands rapidly under high temperature
- Forms an insulating char barrier for flame-retardant and fire protection applications
- Suitable for halogen-free flame-retardant system design
- Widely used in sealing materials, graphite foil, coatings, and composite systems
- Available in different mesh sizes and expansion volume grades
- Can be selected according to sulfur level, particle size, and end-use requirements
- Good compatibility with polymers, coatings, and industrial formulation systems
- Available for sample testing, pilot trials, and bulk industrial supply
Technical Parameters
| Item | Specification |
|---|---|
| Product Name | Expandable Graphite |
| Appearance | Dark Gray to Black Intercalated Flake Graphite |
| Form | Treated Flake Graphite |
| Raw Material Source | Typically Natural Flake Graphite |
| Expansion Behavior | Expands When Heated into Worm-Like Carbon Structure |
| Expansion Volume | Typically 15–20 ml/g to 400 ml/g, depending on grade |
| Particle Size | 32 Mesh / 50 Mesh / 80 Mesh / 100 Mesh / -200 Mesh / -325 Mesh |
| Fixed Carbon | 90%–99.9% |
| Volatile Matter | 16%–19% |
| Sulfur Content | Depending on grade |
| pH | 3–7 |
| Moisture | <0.5% |
| Application Grade | Flame-Retardant Grade / Sealing Grade / Industrial Grade / Customized Grade |
| Process Compatibility | Suitable for different industrial formulation and processing systems |
| Packaging | Sample bottle, kraft paper bag with PE inner liner, jumbo bag, or customized packaging |
| Storage | Store sealed in a cool, dry, and well-ventilated place |
| MOQ | Negotiable |
Typical Technical Specifications of Expandable Graphite
Expandable Graphite is available in different mesh grades and expansion volumes for sealing, refractory, fire-retardant, insulation, and other industrial applications. The following table shows the common technical specifications.
| Specification | Expansion Volume (ml/g) | Fixed Carbon | Volatile Matter | Sulfur Content | pH | Moisture | Particle Size |
|---|---|---|---|---|---|---|---|
| 32 Mesh | 400 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +32 Mesh 80% Min |
| 50 Mesh | 250 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +50 Mesh 80% Min |
| 350 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +50 Mesh 80% Min | |
| 80 Mesh | 250 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +80 Mesh 80% Min |
| 300 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +80 Mesh 80% Min | |
| 350 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +80 Mesh 80% Min | |
| 100 Mesh | 200 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | +100 Mesh 80% Min |
| -200 Mesh | 15–20 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | -200 Mesh 80% Min |
| -325 Mesh | 15–20 | 90%–99.9% | 16%–19% | 2.2 | 3–7 | <0.5% | -325 Mesh 80% Min |
In addition to the above grades, customized specifications are available according to customer requirements.
Main Applications
Product Advantages
- Unique expansion capability under heat exposure
- Effective intumescent performance for flame-retardant formulations
- Supports halogen-free fire protection system design
- Important precursor for expanded graphite and flexible graphite foil
- Available in different mesh sizes and expansion performance grades
- Can form an insulating char barrier under flame or heat exposure
- Suitable for both industrial production and formulation development
- Custom sulfur level, particle size, and packaging options available upon request
Recommended Industries
- Flame-retardant materials industry
- Sealing materials industry
- Graphite foil and flexible graphite industry
- Fire protection coatings industry
- Construction fire protection materials industry
- Plastic and rubber compound industry
- Gasket and sealing sheet industry
- Advanced composite materials industry
- Thermal management materials industry
Packaging & Storage
This product is available in standard packaging and customized packaging options, including sample bottle packaging, kraft paper bags with PE inner liners, small-batch supply, and jumbo bag packaging for bulk industrial shipment. It should be stored in a sealed, cool, dry, and well-ventilated environment, protected from moisture and contamination. Proper storage helps maintain product consistency and expansion performance during practical use.
Customization Service
We can provide suitable Expandable Graphite specifications according to different application requirements, including particle size range, expansion volume, sulfur content, treatment level, packaging method, and supply volume. Sample support, pilot testing, and bulk order services are available for industrial users, manufacturers, and formulation development customers.
