What is Expandable Graphite CAS 7782-42-5?

Expandable Graphite is a graphite-based intercalated material, not a single small-molecule chemical. CAS 7782-42-5 identifies the graphite base material, while expansion performance is controlled by the intercalation treatment, particle size, and commercial grade.

How does Expandable Graphite work as a halogen-free flame retardant?

When exposed to heat, the graphite layers expand and create a low-density insulating carbon layer. This layer helps reduce heat transfer, limit flame spread, and protect the underlying polymer or substrate without relying on bromine or chlorine.

Which parameters should buyers evaluate when selecting a grade?

The most important parameters are expansion volume or expansion ratio, particle size distribution, carbon content, sulfur content, and expansion onset temperature. The selected combination should be matched to the polymer, coating, foam, or sealing system and its processing conditions.

Can Expandable Graphite be used in fire-resistant coatings and sealing materials?

Yes. It is used in intumescent coatings, firestop materials, gaskets, sealing strips, and insulation systems. In these applications, the expansion behavior and particle size are especially important because they affect film quality, sealing performance, and thermal protection.

Why do some formulations require low-sulfur Expandable Graphite?

Sulfur can cause corrosion, odor, or compatibility problems in certain metal-contact, electronic, or sensitive polymer systems. Low-sulfur and super-low-sulfur grades reduce these risks, but the exact sulfur limit should be selected according to the final application and performance requirements.

Expandable Graphite CAS 7782-42-5

Expandable Graphite, also called expansible or intercalated graphite, CAS 7782-42-5, is a processed graphite material supplied for flame retardant, sealing, and thermal protection applications. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 7782-42-5
Synonyms: Expandable Graphite, Expansible Graphite, Intercalated Graphite
Einecs: 231-955-3
Grade: Flame retardant / industrial / low sulfur grade
Package: 25kg bags / jumbo bags / customized packaging

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Product Description

Expandable Graphite CAS 7782-42-5 is a graphite-based intercalated material, not a single small-molecule chemical.

Synonyms: Expansible Graphite; Intercalated Graphite.

CAS: 7782-42-5.

It does not have a single molecular formula because it is a graphite-based intercalated material.

Expansion performance is controlled by intercalation treatment, particle size, and commercial grade.

It is supplied as a powder or granule material.

It is positioned for flame retardant, sealing, and thermal protection applications.

It expands rapidly at elevated temperature to form an insulating carbon layer.

It is used in plastics, coatings, and construction materials.

It is used in intumescent coatings, firestop materials, gaskets, sealing strips, and insulation systems.

It helps reduce heat transfer, limit flame spread, and protect the underlying polymer or substrate without bromine or chlorine.

Low-sulfur and super-low-sulfur grades reduce corrosion, odor, or compatibility problems in metal-contact, electronic, or sensitive polymer systems.

Confirm expansion volume or ratio, particle size distribution, carbon content, sulfur content, and expansion onset temperature.

Store in tightly closed containers in a cool, dry, well-ventilated area, away from moisture and direct sunlight.

Use suitable PPE when handling the material to prevent dust exposure and skin or eye contact.

Confirm packaging suitable for the solid form and order quantity, and follow the current SDS.

Confirm grade, packaging, and specification as required.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended application, required grade, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Expandable Graphite CAS 7782-42-5?

A: Expandable Graphite is a graphite-based intercalated material, not a single small-molecule chemical. CAS 7782-42-5 identifies the graphite base material, while expansion performance is controlled by the intercalation treatment, particle size, and commercial grade.
Q:
How does Expandable Graphite work as a halogen-free flame retardant?

A: When exposed to heat, the graphite layers expand and create a low-density insulating carbon layer. This layer helps reduce heat transfer, limit flame spread, and protect the underlying polymer or substrate without relying on bromine or chlorine.
Q:
Which parameters should buyers evaluate when selecting a grade?

A: The most important parameters are expansion volume or expansion ratio, particle size distribution, carbon content, sulfur content, and expansion onset temperature. The selected combination should be matched to the polymer, coating, foam, or sealing system and its processing conditions.
Q:
Can Expandable Graphite be used in fire-resistant coatings and sealing materials?

A: Yes. It is used in intumescent coatings, firestop materials, gaskets, sealing strips, and insulation systems. In these applications, the expansion behavior and particle size are especially important because they affect film quality, sealing performance, and thermal protection.
Q:
Why do some formulations require low-sulfur Expandable Graphite?

A: Sulfur can cause corrosion, odor, or compatibility problems in certain metal-contact, electronic, or sensitive polymer systems. Low-sulfur and super-low-sulfur grades reduce these risks, but the exact sulfur limit should be selected according to the final application and performance requirements.

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