Chemical Composition
- SiO₂
- 97.5
- Fe₂O₃
- up to 1
- Moisture
- up to 0.5
- Clay
- up to 0.5
- Al₂O₃
- up to 0.5
Technical
Foundry Grade
Silica Sand For Foundry Industry — specifications, physical properties and AFS grain size guidance.
Specifications
Silica Sand For Foundry Industry
Physical Properties
- High hardness (approx. 7 on the Mohs scale)
- Excellent thermal resistance
- Uniform grain size distribution
- Chemically stable and suitable for foundry applications
Importance of Grain Size (AFS)
- Better mold permeability
- Improved casting surface finish
- Higher mold strength
- Reduced casting defects
AFS Chart
Foundry Grade Table
Recommended applications by AFS grade and grain size.
AFS 40-45Coarse
Heavy-duty molds with high permeability
AFS 45-50Medium Coarse
General-purpose foundry molds
AFS 50-55Balanced
Standard casting applications
AFS 55-60Medium
Balanced strength and finish
AFS 60-65Medium Fine
Improved surface finish
AFS 65-70Fine
Intricate and non-ferrous castings
AFS 70-80Very Fine
Precision molds
AFS 80-90Ultra Fine
High-detail casting applications
Need a consistent silica sand supply?
Tell us your AFS grade, volume and packaging — we will send a quotation with test parameters.