Merck
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808121

Sigma-Aldrich

Expandable Graphite

flakes

Synonym(s):
Intumescent flake graphite, Graphite intercalation compound
Linear Formula:
C24(HSO4)(H2SO4)2
NACRES:
NA.23

Quality Level

description

Expansion Ratio (X:1): 270 to 325

form

flakes

particle size

+50 mesh (>300μ, ≥75% minimum)

pH

5-10

solubility

water: insoluble

General description

Expandable graphite is a synthesized intercalation compound of graphite that expands or exfoliates when heated. This material is manufactured by treating flake graphite with various intercalation reagents that migrate between the graphene layers in a graphite crystal and remain as stable species.
If exposed to a rapid increase in temperature, these intercalation compounds decompose into gaseous products, which results in high inter-graphene layer pressure. This pressure develops enough force to push apart graphite basal planes in the “c” axis direction. The result is an increase in the volume of the graphite of up to 300 times, a lowering of bulk density, and approximately a 10-fold increase in surface area.

Application

  • Graphene precursor.
  • Inorganic source of carbon.
  • Filler.
  • Thermal additive.
  • Fire retardant additive.
  • Casting powders.
  • Plastic additive.
  • Rubber additive.
  • EMF absorber.
  • Milling and sieving.
  • Bulk loading, unloading.
  • Base material for gaskets and seals.
  • Coatings.

Packaging

2.5 kg in poly drum

Pictograms

Health hazard

Signal Word

Warning

Hazard Statements

Precautionary Statements

Hazard Classifications

STOT RE 2 Inhalation

Target Organs

Lungs

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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