Qingdao Hensen Graphite Co., Ltd.
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Expandable graphite powder is a unique form of graphite that has the ability to expand when exposed to high temperatures. It is derived from natural graphite, which is a crystalline form of carbon. The production process involves treating the graphite with various chemicals and intercalating agents, which introduce spaces between the layers of carbon atoms.
The expansion properties of expandable graphite powder make it a highly versatile material with numerous applications across various industries. One of its primary uses is as a flame retardant additive. When incorporated into polymers, textiles, or other materials, expandable graphite powder can act as a barrier against fire by releasing a dense layer of non-flammable carbon char when exposed to heat or flames. This char layer acts as a shield, preventing the spread of fire and reducing the risk of ignition.
Expandable graphite powder is also employed in the production of graphite foams and composites. When the powder is mixed with certain binders and subjected to high temperatures, it undergoes controlled expansion, resulting in a lightweight and highly porous material known as graphite foam. Graphite foams possess excellent thermal conductivity, making them suitable for applications such as heat sinks, thermal insulation, and energy storage devices.
Furthermore, expandable graphite powder finds use as an additive in lubricants and coatings. Due to its high temperature stability and low friction properties, it can improve the performance and durability of these products. It can also be utilized as a component in gaskets, seals, and other applications where its expandability and thermal resistance are advantageous.
| Grade Name | Mesh | Expansion Ratio (cc/g) | Purity (%) |
Moisture (%) |
PH | Sulfur (ppm) |
Onset Temp (°C) |
Application |
| HS555 | +50 | 250:1 | 95-97 | <1 | 6-9 | * | 160-180 | PU foam, Bituman. |
| HS855 | +50 | 250:1 | 98-99 | <1 | 6-9 | * | 160-180 | PU foam, Bituman. |
| HS955 | +50 | 250:1 | 99-99.5 | <1 | 6-9 | * | 160-180 | PU foam, Bituman, for application require least instruments damage. |
| HS085 | +80 | 250:1 | 90-95 | <1 | 6-9 | * | 160-180 | PU foam, EPS foam, XPS foam, sealing strip. |
| HS585 | +80 | 250:1 | 95-97 | <1 | 6-9 | * | 160-180 | PU foam, EPS foam, XPS foam, sealing strip. |
| HS055 | +50 | 250:1 | 90-95 | <1 | 6-9 | * | 160-180 | PU foam, EPS foam, XPS foam, sealing strip. |
| HS988 | +80 | 180:1 | 99-99.5 | <1 | 6-9 | <1500 | * | Graphite foil, roll, gaskets. |
| HS980HP | +80 | 200:1 | 99.5-99.8 | <1 | 6-9 | <1500 | * | Graphite foil, roll, gaskets. |
| HS980UHP | +80 | 200:1 | >99.9 | <1 | 6-9 | <1500 | * | Battery. |
| HS557 | +50 | 270:1 | 95-97 | <1 | 6-9 | * | 160-180 | Steel oxygen protection. |
| HS611 | -100 | 100:1 | 96-98 | <1 | 6-9 | * | 160-180 | Fireproof textile. |
| HS223 | -200 | 30:1 | 92-95 | <1 | 6-9 | * | 160-180 | Thin coating. |
| HS5HE | +50 | 350:1 | 95-97 | <1 | 6-9 | * | 160-180 | Collar pillar. |
| HS9HE | +50 | 350:1 | 99-99.5 | <1 | 6-9 | * | 160-180 | Collar pillar, for application require least instruments damage. |
| HS558HT | +50 | 180:1 | 95-97 | <1 | 6-9 | * | 220 | Mixing, extruding or processing at higher temperatures. Used as fire-retardant additive in PE, PP, and HIPS. |
| HS558UHT | +50 | 180:1 | 95-97 | <1 | 6-9 | * | 250 | Processing temperatures are very high. Used as fire-retardant additive in PE, PP, and HIPS. |
- Special grades with different specs are also available on request. Please contact us for details.