Bentonite and Gilsonite Blends for Green Sand

Many foundries buy pre-mixed blends of bentonite and carbon additives. Gilsonite is an excellent carbon component for these blends.

Why blends

• Simplified handling and dosing
• Consistent ratio of clay to carbon
• Less dust at the muller

Typical blend ratios

Bentonite-to-carbon ratios vary from about 3:1 to 6:1 depending on the foundry.

Advantages of gilsonite in blends

• Lower carbon dosage for the same effect
• Low ash, so less dead clay and fines
• Good mixing with clay

For blend producers

Sun Gilsonite supplies foundry grade gilsonite in 1 MT jumbo bags for blending plants.

Benefits for the foundry

• One product to store and dose
• Consistent ratio between clay and carbon
• Less dust and simpler logistics

Benefits for blend producers

Gilsonite’s high activity means less carbon additive by weight in the blend, leaving room for more bentonite or a lower cost blend.

Quality checks for blends

See gilsonite vs. sea coal.