Expandable Graphite
Expandable Graphite is an intercalated flake graphite material that expands under heat, forming a worm-like carbon structure for flame-retardant systems, sealing materials, graphite foil production, coatings, and industrial formulations.
Flame-Retardant Use
Sealing and Foil Applications
Custom Grade Selection
PARTICLE SIZE
32 / 50 / 80 / 100 / -200 / -325 Mesh
PURITY / FIXED CARBON
90%–99.9% Fixed Carbon by Grade
ASH CONTENT
Ash / Sulfur Controlled by Grade
MOISTURE
<0.5% Typical Reference Value
PRODUCT SPECIFICATIONS AND DETAILS
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 functional raw material for flame-retardant systems, sealing materials, graphite foil production, fire protection products, and selected industrial formulation 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 carbon material processing applications. At QDZRT Graphite, suitable grades can be supplied according to particle size, expansion volume, sulfur level, treatment process, and end-use requirements.
Table of Contents
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Key Features
- Supplied in flake form before heating and expands rapidly under elevated 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, expansion performance, and end-use requirements
- Good compatibility with polymers, coatings, rubber, and industrial formulation systems
- Available for sample testing, pilot trials, and bulk industrial supply
Technical Parameters
The following values are typical reference ranges for product selection. Final specifications may vary according to mesh size, expansion volume, sulfur level, treatment process, and application requirements.
| 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 a worm-like carbon structure |
| Expansion Volume | Approx. 15–400 mL/g depending on mesh size and grade |
| Particle Size | 32 mesh / 50 mesh / 80 mesh / 100 mesh / -200 mesh / -325 mesh |
| Fixed Carbon | 90%–99.9% depending on grade |
| Volatile Matter | Typical range: 16%–19% |
| Sulfur Content | Grade-dependent; low-sulfur options can be discussed according to application requirements |
| pH | 3–7 depending on grade |
| Moisture | <0.5% typical reference value |
| 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 according to grade and order requirement |
Typical Technical Specifications of Expandable Graphite
Expandable Graphite is available in different mesh grades and expansion volumes for sealing, flame-retardant, insulation, fire protection, and other industrial applications. The following table shows common grade directions for inquiry reference. Final values should be confirmed according to the selected grade and quotation details.
| Specification | Expansion Volume (mL/g) | Fixed Carbon | Volatile Matter | Sulfur Content | pH | Moisture | Particle Size |
|---|---|---|---|---|---|---|---|
| 32 Mesh | 400 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +32 Mesh 80% Min |
| 50 Mesh | 250 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +50 Mesh 80% Min |
| 350 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +50 Mesh 80% Min | |
| 80 Mesh | 250 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +80 Mesh 80% Min |
| 300 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +80 Mesh 80% Min | |
| 350 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +80 Mesh 80% Min | |
| 100 Mesh | 200 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | +100 Mesh 80% Min |
| -200 Mesh | 15–20 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | -200 Mesh 80% Min |
| -325 Mesh | 15–20 | 90%–99.9% by grade | 16%–19% | Grade-dependent | 3–7 | <0.5% | -325 Mesh 80% Min |
In addition to the above grade directions, customized specifications are available according to customer requirements, including expansion volume, mesh size, sulfur level, treatment process, and packaging format.
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 industrial production, pilot testing, and formulation development
- Custom sulfur level, particle size, expansion volume, 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
- 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. Packaging can be arranged according to grade, order quantity, transport method, and customer handling requirements.
Expandable Graphite should be stored in a sealed, cool, dry, and well-ventilated environment, protected from moisture and contamination. Proper storage helps maintain product consistency, handling stability, and expansion performance during practical use.
Customization Service
QDZRT Graphite can provide suitable Expandable Graphite specifications according to different application requirements, including particle size range, expansion volume, sulfur level, treatment process, packaging method, and supply volume. Sample support, pilot testing, and bulk order services are available for industrial users, manufacturers, and formulation development customers.
For faster grade matching, buyers are encouraged to provide the target application, required mesh size, expected expansion volume, sulfur requirement, processing temperature, formulation system, packaging preference, and estimated order quantity. These details help select a more suitable Expandable Graphite grade for flame-retardant systems, sealing materials, graphite foil production, coatings, composites, and other industrial applications.
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Natural Flake Graphite
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