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Expandable graphite
产品名称:Expandable graphite
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Expandable graphite

(CAS: 7782-42-5)

Product features:
Expandable graphite is a specially synthesized intercalation compound of graphite. Graphite’s flaky, layered structure makes it possible to introduce outside atoms or small molecules between the graphite layers. This process is called intercalation and the result is an expandable graphite salt or a graphite intercalation compound. The material gets its name because, when exposed to heat, the intercalated graphite layers expand and separate like an accordion. The final expanded volume can be hundreds of times greater than the initial volume of the material. The intercalation agent and the proportion of intercalated layers determine the temperature at which expansion begins and the rate at which expansion occurs.
Expansion of the flake graphite decreases the material’s overall bulk density while increasing its surface area; this change yields a material that demonstrates increased chemical reactivity over the original material. Expandable graphite is valued as a flame retardant. Expansion creates an intumescent layer on the surface of the graphite flake that slows the spread of fire and minimizes the creation of toxic fumes and gases..
Quality index: 

 

Purity, (%)

Moisture, (%)

Particle size, mesh

Expansion ratio

EG 100

96 - 99

≤ 0.5

200

≥ 150

EG 200

96 - 99

≤ 0.5

60 – 80

≥ 230

EG 300

96 - 99

≤ 0.5

60 – 80

≥ 300

EG 400

96 - 99

≤ 0.5

60 – 80

≥ 300

Uses:
Flame retardant Sealing strip used for fire doors, fire glass windows etc.
Fireproof bag, fireproof blocking material, firestop rubber ring.
Fire resistant coating.
Insulation board.
Flame retardant plastic.
EG 100: A fine product, size is at 200 mesh,
EG 200: Temperature of starting expansion is at 250℃ min, available for XPS extrusion plate and other products requiring extrusion process.
EG 300: Good dispersion and particle size distribution, available for pu foam, graphite polystyrene board, EPS, fireproof sealing strip, polystyrene insulation board etc.
EG 400: Temperature of starting expansion is at 165℃ max, available for high-quality flame retardant products.
Packing, storage and transportation:
20 kg/bag, 25 kg/bag by composited paper bag, and ton bag.
Handle with care during transportation.

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