Import 250ml/G Expandable Graphite Powder — Buy in wholesale FOB from Supplier in China

This expandable graphite powder from Shandong Sungraf Carbons Co., Ltd has a nominal expansion rate of 250 ml/g, placing it in the mid-range of intumescent grades. The material is produced from intercalated natural flake graphite with fixed carbon content between 85% and 99.9%, depending on the specific grade ordered. Available particle sizes span +32 mesh to +150 mesh, corresponding to 495 microns down to 106 microns, which affects both handling characteristics and final application performance in fire-retardant systems.

The expansion mechanism relies on thermal decomposition of intercalated compounds, typically sulfuric acid or nitric acid species, which generate gas at 150-300°C to force apart graphite layers. This creates a voluminous, thermally insulating char that blocks heat transfer and oxygen access. Fixed carbon above 90% is typical for fire-stop and gasket applications, while lower carbon grades may suit less demanding filler uses. The pH range of 3-8 indicates variable residual acid content after washing, which can affect compatibility with polymer matrices and corrosion of metal substrates in composite panels.

Primary applications include fire-retardant coatings for steel structures, intumescent seals for fire doors and penetration systems, graphite gaskets for high-temperature service, and additives in battery electrode formulations. The product also serves as a raw material for producing flexible graphite foil and sheets. Buyers are typically manufacturers of passive fire protection systems, gasket producers, battery material suppliers, and metallurgical operations requiring high-temperature lubrication. Shandong Sungraf Carbons Co., Ltd operates from Qingdao, Shandong Province, a region with established graphite mining and processing infrastructure, though buyers should confirm specific production capabilities and export licensing directly.

Shandong Sungraf Carbons Co., Ltd is located on Duhua Road in Qingdao, Shandong Province, China, postal code 266000. Qingdao is a major port city with established graphite processing and export logistics, which may reduce inland transport complexity for international shipments. The company holds a 'harbor' trust tier. However, the response rate is recorded at 0.00% with zero average response hours, indicating no platform-mediated communication history is available to assess responsiveness.

The listing describes the company as dealing in expandable graphite for fire retardant, construction, and chemical processing applications, but provides no information on production scale, factory certification, years in operation, or specific quality management systems such as ISO 9001. No client references, export volumes, or proprietary processing capabilities are stated. The custom specification mentions suitability for 'industrial chemical processing and export trade' without elaboration. Buyers must conduct direct due diligence to confirm production capacity, whether the company owns processing equipment or acts as a trader, and their experience with specific end-market specifications such as ASTM, EN, or UL fire-test requirements.