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Granulated Blast Furnace Slag (GBFS)

More Than Just Slag — A Reliable Material for Modern Construction

Granulated Blast Furnace Slag (GBFS) is primarily composed of reactive silicate compounds and is widely used as a construction material raw input and industrial auxiliary material. As a by-product of the ironmaking process, GBFS enables efficient resource recycling while delivering strong performance in building and infrastructure applications.

Core Chemical Composition

The main constituents of GBFS are dicalcium silicate (C₂S) and tricalcium silicate (C₃S), supported by tricalcium aluminate (C₃A) and tetracalcium aluminoferrite (C₄AF). These silicate and aluminosilicate compounds form the foundation of GBFS’s performance characteristics.

Secondary components include calcium oxide (CaO), silicon dioxide (SiO₂), aluminum oxide (Al₂O₃), and magnesium oxide (MgO). Exact proportions may vary slightly depending on iron ore and fuel sources used during production.

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Key Application Value

• Construction Materials Applications

When finely ground, GBFS can be used to produce slag cement, significantly improving long-term strength, impermeability, and corrosion resistance. As a concrete admixture, it enhances workability, reduces heat of hydration, and improves overall construction performance and structural durability.

• Diversified Industrial Applications

GBFS can be further processed into slag powder (a high-performance construction additive) or mineral wool for thermal insulation. It is also suitable for road base filling, brick manufacturing, and as a supplementary raw material in glass-ceramic production.

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Secured Factory-Direct GBFS Supply

We maintain long-term contractual partnerships with multiple blast furnace slag producers in Tangshan, enabling us to source GBFS directly from the factory. This stable upstream integration ensures consistent product quality, reliable supply volumes, and full traceability from production to delivery. By working closely with our partner factories, we are able to respond efficiently to market demand while maintaining strict quality and logistics control for both domestic and international customers.

Optimized Logistics, Lower Delivered Cost

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Because our GBFS is sourced directly from partner factories, we are able to eliminate unnecessary intermediaries, resulting in a more cost-effective supply structure for our customers. In addition, our partner plants are strategically located near major ports in the Tangshan region, significantly reducing inland transportation distance and handling costs. This proximity allows for faster turnaround, optimized loading operations, and lower overall logistics expenses, providing customers with competitive pricing and a more efficient end-to-end delivery solution.

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Laboratory report showing test results for glass and raw materials, including silica, alumina, calcium oxide, magnesium oxide, chloride, sulfate, manganese oxide, iron oxide, loss on ignition, moisture, and size, with standard references.

Our GBFS Specs