Fused Silica for Foundry Applications

Why Fused Silica Is Used in Foundry Applications

Fused Silica is an amorphous silica material with extremely low thermal expansion and excellent thermal shock resistance, making it an ideal material for demanding foundry environments.

In modern foundries, fused silica is widely used to reduce casting defects, improve dimensional accuracy, and extend the service life of molds and refractory components under high-temperature and cyclic thermal conditions.

Fused Silica A & B Grade for Foundry Use

Premium Grade

Fused Silica A Grade

99.9% SiO₂

Used in high-precision and critical casting applications, where ultra-low impurities and maximum thermal stability are required.

View A Grade Details

Standard Grade

Fused Silica B Grade

99.8% SiO₂

A cost-effective and reliable choice for standard foundry operations, offering stable performance and excellent resistance to thermal shock.

View B Grade Details

Both Grades Feature:

5 × 10⁻⁷ /°C

Linear Thermal Expansion (20–700°C)

>99%

Amorphous Glass Content

1650°C

High Softening Temperature

Typical Foundry Applications of Fused Silica

Fused Silica A and B Grade are widely used in foundry processes, including:

Foundry Sand

For molds and cores

Core Sand

For steel and alloy castings

Induction Furnace Lining

Lining and ramming mass

High-Temp Refractories

Foundry refractory materials

Precision Castings

Complex-shaped castings

Low Expansion Applications

Critical thermal stability

Key Benefit: The use of fused silica helps minimize veining, cracking, penetration, and thermal distortion during casting.

Performance Benefits in Foundry Operations

Ultra-Low Thermal Expansion

Reduces internal stress and dimensional changes during metal pouring and cooling, ensuring consistent casting quality.

Excellent Thermal Shock Resistance

Withstands rapid heating and cooling cycles without cracking, extending mold and refractory service life.

High Refractoriness

Maintains structural stability under molten metal contact, suitable for demanding casting conditions.

Chemical Stability

Good resistance to acid and chemical attack in foundry environments, reducing material degradation.

These properties contribute to higher casting quality, reduced scrap rates, and improved production efficiency.

Available Forms for Foundry Applications

Fused silica for foundry use is available in multiple forms to meet various process requirements:

Grains

For foundry sand and cores

Powders

For ramming mass and refractory formulations

Custom PSD

Customized particle size distributions

Standard ISO and ASTM sizes are available to meet various foundry process requirements.