Foundries are manufacturing facilities that produce metal castings by pouring molten metal into molds and allowing it to solidify into desired shapes and dimensions. Common casting materials include cast iron, steel, aluminum, brass, bronze, zinc, and magnesium alloys. To achieve high-quality castings, foundries rely heavily on molding sands and specialized additives that improve mold performance and casting finish.
Gilsonite is widely used as a premium carbon additive in foundry sand systems. Its unique carbon structure, high volatile content, and lustrous carbon generation make it an effective alternative to traditional sea coal, providing superior mold release, improved casting surfaces, and reduced casting defects.
Produces a protective carbon layer that improves casting surface quality and reduces metal penetration into the mold.
Generates greater gas evolution than sea coal, allowing easier separation of castings from molds.
Creates a reductive atmosphere that minimizes reactions between molten metal and molding sand.
Delivers superior performance at lower addition rates compared with conventional carbonaceous additives.
During metal casting, molten metal is exposed to extremely high temperatures that can cause reactions between the mold and the metal. Gilsonite helps reduce these reactions while improving the physical properties of molding sand.
Produces cleaner surfaces with improved finish quality and reduced post-processing requirements.
Forms a protective carbon barrier that reduces metal penetration into the mold structure.
Allows castings to separate more easily from the mold, improving production efficiency.
Enhances mold performance and decreases interruptions caused by defective castings.
| Property | Gilsonite | Sea Coal |
|---|---|---|
| Lustrous Carbon Generation | High | Moderate |
| Mold Release | Excellent | Standard |
| Casting Surface Finish | Superior | Acceptable |
| Addition Rate | Lower | Higher |
| Defect Reduction | Excellent | Moderate |
Gilsonite is commonly incorporated into green sand formulations alongside bentonite clay, metallurgical coke, iron oxide, cellulose materials, and other foundry additives. Its carbon-rich structure contributes to improved mold integrity and casting performance.
Helps maintain mold structure during pouring and cooling cycles.
Forms a protective interface between mold and molten metal.
Minimizes oxidation and unwanted reactions during casting.
Can help reduce certain emissions when properly incorporated into optimized sand systems.
| Component | Typical Percentage |
|---|---|
| Iron Oxide | Approximately 4% |
| Gilsonite | Approximately 4% |
| Metallurgical Coke | Approximately 16% |
| Clay and Other Materials | 70% – 75% |
Supplied in 500–1000 kg jumbo bags for bulk industrial foundry applications.
Suitable for standard foundry sand formulations requiring controlled particle size.
Available in jumbo bags, multi-paper bags, and palletized packaging options.
Ultra-fine grade for specialized foundry and high-performance casting applications.
Gilsonite has established itself as a highly effective carbon additive for foundry sand systems worldwide. Its ability to generate high levels of lustrous carbon, improve mold release, reduce casting imperfections, and enhance surface finish makes it a preferred choice for high-value iron and metal casting operations. By improving casting quality while reducing defects and operational downtime, Gilsonite delivers both technical and economic benefits to modern foundries.
