Sodium Silicate Investment Casting Process

Sodium silicate investment casting, also known as water glass casting, is a cost-effective precision casting method widely used for steel and alloy components in industries such as automotive, construction, and machinery.

1. Wax Pattern Creation

A wax model of the final part is produced using injection molding or manual shaping.

2. Shell Building with Sodium Silicate

The wax model is dipped into a ceramic slurry, followed by a sodium silicate binder, which strengthens the ceramic shell. Multiple layers are applied to ensure durability.

3. Wax Removal & Metal Pouring

The wax inside the shell is melted away, leaving a hollow mold. Molten metal is then poured into the cavity.

4. Cooling & Shell Removal

Once the metal solidifies, the ceramic shell is broken away, revealing the cast part.

5. Surface Treatment & Inspection

The cast part undergoes cleaning, grinding, and machining for better accuracy and surface finish. Strict quality control ensures precision.

Advantages of Sodium Silicate Casting

✅ Cost-Effective – More affordable than lost wax casting.
✅ High Strength & Durability – Ideal for heavy-duty applications.
✅ Versatile Material Use – Suitable for carbon steel, alloy steel, and stainless steel.
✅ Smooth Surface Finish – Reduces the need for extensive machining.

This method is widely used in industrial machinery, construction equipment, and transportation parts, offering a balance between cost and precision.