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GRAPHITE PRODUCTS
Graphite Products
Medium & High Carbon Flake Graphite
High Purity Flake Graphite
Micronized Graphite
Special Powder for Alkaline Battery
Ordinary Natural Spherical Graphite
High-end Modified Natural Graphite
High-end Artificial Graphite Anode Material
Expandable Graphite
  • 名称:High Purity Expandable Graphite
  • 型号:EG200, EG250, EG300, EG350, EG400
  • 规格: 32 mesh, 50 mesh, 80 mesh, 100 mesh
  • 备注:可以根据具体需要定制碳量倍数,纯度99%以上
  • 详情:

    Expandable graphite, aka flexible graphite, is made by high-temperature transient processing of our high-quality natural flake graphite. After the processing, its shape changes to wormlike from flake while its volume could be 100~450 times larger. Graphite crystal has hexagonal net plane layered structure consisting of carbon. Carbon atoms on the layer are bonded by strong covalent bond while layers are bonded by weak VDW with a larger  distance.Therefore, under the right conditions, multiple chemicals such as acid metal, alkali metal and salt chemicals could insert graphite layers and combine with carbon atoms to form GIC (Graphite Intercalation on Compounds). Heated to appropriate temperature, GIC would decompose instantly and produce a lot of gas, which makes graphite expand along the axis direction and form new wormlike substance, that is expandable graphite.

    1. superior flexibility, mouldability, self-lubrication and resistance to pressure.

    2. superior resistance to corrosion, radiation, high low temperature.

    3. superior resistance to shock.

    4. superior conductivity.

    5. superior resistance to distortion and anti-ageing.

    6. resistance to fusion and permeation of all kinds of metal.

    7. no toxic, no cancerogen, no harm to the environment.

    Expandable graphite sheet is different from other swelling agent. Graphite would start expanding when heated to a certain temperature which is called initial expansion temperature, then expand completely at 1000℃ and reach its maxim volume. Its volume could be more than 200 times larger than the original. Graphite after the expansion are called expandable graphite or graphite worms, changing from flake to low-density wormlike and forming an excellent thermal insulation blanket. Expandable graphite is not only the carbon source in the expansion system, but also an effective heat insulating layer which has the characteristics of low heat release rate, small mass loss and less smoke in the fire.

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  • 产品参数
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Expandable graphite, aka flexible graphite, is made by high-temperature transient processing of our high-quality natural flake graphite. After the processing, its shape changes to wormlike from flake while its volume could be 100~450 times larger. Graphite crystal has hexagonal net plane layered structure consisting of carbon. Carbon atoms on the layer are bonded by strong covalent bond while layers are bonded by weak VDW with a larger  distance.Therefore, under the right conditions, multiple chemicals such as acid metal, alkali metal and salt chemicals could insert graphite layers and combine with carbon atoms to form GIC (Graphite Intercalation on Compounds). Heated to appropriate temperature, GIC would decompose instantly and produce a lot of gas, which makes graphite expand along the axis direction and form new wormlike substance, that is expandable graphite.

1. superior flexibility, mouldability, self-lubrication and resistance to pressure.

2. superior resistance to corrosion, radiation, high low temperature.

3. superior resistance to shock.

4. superior conductivity.

5. superior resistance to distortion and anti-ageing.

6. resistance to fusion and permeation of all kinds of metal.

7. no toxic, no cancerogen, no harm to the environment.

Expandable graphite sheet is different from other swelling agent. Graphite would start expanding when heated to a certain temperature which is called initial expansion temperature, then expand completely at 1000℃ and reach its maxim volume. Its volume could be more than 200 times larger than the original. Graphite after the expansion are called expandable graphite or graphite worms, changing from flake to low-density wormlike and forming an excellent thermal insulation blanket. Expandable graphite is not only the carbon source in the expansion system, but also an effective heat insulating layer which has the characteristics of low heat release rate, small mass loss and less smoke in the fire.

Item: 9980200 9980250 9980300 9950200 9950250 9950300 9950350
Particle Size: 32 mesh, 50 mesh, 80 mesh
Expansion Rate: 100-450 ml/g
Properties: excellent expansiveness,its product has high-temperature and radiation resistance, self-lubricant, mouldability, heat insulation and good chemical stability.

Item

Particle Size

Expansion Rate (ml/g)

PH Value

Volatile (%)

Water (%)

Carbon Content (%)

Grain Diameter(%)

Sulfur (%)

Expansion Temperature

oversize

undersize

High Purity Expandable Graphite

32 mesh

200-400

3-7

≤15.00

≤1.00

≥99.80

≥80.0


≤2.50

≥950℃

50 mesh

200-350

80 mesh

150-250

100 mesh

100-200

1. high energy battery material

Adding high purity expandable graphite (carbon content >99.5%) to zinc anode of Zinc-manganese rechargeable battery could reduce the polarization of zinc anode during charging, enhance the conductivity of electrode and electrolyte and Inhibit dendrite formation, providing good molding properties, inhibiting anodic dissolution and deformation and prolonging battery life. In addition, lithium can form GICs by gas, liquid, solid and lithium electrolysis with graphite, which has low electrode potential and good intercalation and release reversibility.

2. fire safety material

In some foreign countries, expandable graphite has been added to interlayers of cabin seats or made as fire seal strip, fire block material, fire ring and so on. Once the fire, it would expand instantly and block the fire path. In addition, better flame retardant antistatic coating could be made by adding fine particles of expandable graphite to ordinary coatings. According to Cai Mingxia's research about APP, EG, EVA and their flame retardant mechanism, both APP and EG has good synergistic flame retardant effect.

3. flame retardant sheet material

Expandable graphite sheet is a new type of exothermic material since it has excellent electric and thermal conductivity, with the electric heat transfer rate of more than 97%, and could produce far infrared ray. Expanded graphite could be pulverized into fine powder, which has strong scattering and absorption characteristics of infrared wave and is a good infrared shielding (stealth) material. The expandable graphite is made into pyrotechnique, and the instant explosion forms the expandable graphite and disperses in the predetermined air space to form the aerosol interfering cloud smoke agent. In addition, expanded graphite can also be used as thermal insulation, sound insulation materials, electromagnetic shielding elements, catalytic materials.

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地址:山东省青岛市昆山路17号
电话:+(86)532-85674111
手机:+(86)18669813376
传真:0532-85671999
邮箱:info@cnsungraf.com
QQ:10829651随时沟通
微信:angdun
此文关键词:high purity graphite graphite, expandable graphite
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