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808121

Sigma-Aldrich

Expandable Graphite

flakes

Synonym(s):

Graphite intercalation compound, Intumescent flake graphite

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About This Item

Linear Formula:
C24(HSO4)(H2SO4)2
UNSPSC Code:
12352200
NACRES:
NA.23

description

Expansion Ratio (X:1): 270 to 325

Quality Level

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.

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


Certificates of Analysis (COA)

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Siegfried Eigler
Chemical communications (Cambridge, England), 51(15), 3162-3165 (2015-01-22)
Graphite sulphate is used as a precursor to graphene for the first time. The positively charged graphene layers react with water to yield a processable graphene derivative. The unprecedented low density of defects is determined to be 0.06% on average
Electrochemical reactivation of expanded graphite electrodes covered by oligomeric products of phenol electrooxidation.
Krawczyk P, and Skowronski, JM.
Electrochimica Acta, 79, 202-209 (2012)
Nicolas R Tanguy et al.
ChemSusChem, 14(4), 1057-1067 (2020-11-28)
The increasing demand for wearable electronics has driven the development of supercapacitor electrode materials toward enhanced energy density, while being mechanically strong, flexible, as well as environmentally friendly and low-cost. Taking advantage of faradaic reaction of quinone groups in natural
Ayrat M Dimiev et al.
ACS nano, 6(9), 7842-7849 (2012-08-14)
Graphite intercalation compounds (GICs) can be considered stacks of individual doped graphene layers. Here we demonstrate a reversible formation of sulfuric acid-based GICs using ammonium persulfate as the chemical oxidizing agent. No covalent chemical oxidation leading to the formation of

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