For over 60 years foundrymen have used Wyoming sodium bentonite as the binder of choice for making greensand molds for metal castings. Big Horn® Foundry Grade Bentonite is a unique blend of high quality Wyoming bentonite that has been specifically designed to have properties similar to those found in custom blends of sodium and calcium bentonites.

The rapid rate of water absorption and low water requirement for activation often result in shorter mulling times for sands bound with Big Horn® Foundry Grade Bentonite. These sands exhibit high green, dry and hot compression strengths with low compactability, good permeability and a high level of durability.

This makes Big Horn® Foundry Grade Bentonite an excellent binder choice for all types of greensand metal casting.