Name: Expandable Graphite
Brand: QDZRT Graphite
SKU: GRM2-GPR-S2-KPZ-N

Product 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 Show Table of Contents

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 specification review, pilot planning, 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	Small-lot container, 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
50 Mesh	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

Halogen-Free Flame Retardants: Expandable Graphite is widely used in halogen-free flame-retardant systems. Under heat or flame exposure, it expands and forms a protective char layer that helps reduce heat transfer, slow flame spread, and improve fire resistance in polymers, foams, coatings, and construction-related materials.
Sealing Materials and Graphite Foil Production: Expandable Graphite is an important precursor for expanded graphite and flexible graphite foil. These materials are widely used in gaskets, seals, packing products, and graphite sheet applications requiring temperature resistance, chemical stability, and long-term sealing performance.
Coatings and Fire Protection Materials: In specialty coatings and fire protection systems, Expandable Graphite can function as an intumescent component that enhances thermal shielding and supports fire-resistant surface material design.
Plastic, Rubber, and Composite Systems: Expandable Graphite can be incorporated into polymers, elastomers, and composite materials where flame retardancy, thermal functionality, or multifunctional filler performance is required. It is suitable for both formulation development and industrial production.
Thermal Management and Functional Carbon Systems: Expanded graphite derived from Expandable Graphite can also be used in selected thermal management, heat dissipation, and specialty carbon material systems, including graphite boards, foils, and related industrial components.
Other Industrial Applications: Depending on product grade and process design, Expandable Graphite may also be used in foundry additives, specialty fillers, insulation systems, and carbon-based material processing applications requiring expansion behavior.

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 small-lot container 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. Specification review, pilot planning, 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.