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Silica Sol for Foundry Grade Comparison
| Model | Foundry Direction | Particle Size | SiO₂ Content | Na₂O Content | pH | Shelf Life |
|---|---|---|---|---|---|---|
| PC10 | Backup-layer trial | 8–15 nm | 27±1% | ≤0.4% | 9.5–10.5 | ≥12 months |
| PC20 | Primary face-coat trial | 10–20 nm | 30±1% | ≤0.4% | 9.5–10.5 | ≥12 months |
The published directions are starting points for ceramic-shell trials. Final approval depends on refractory flour and stucco, slurry formulation, shell-building sequence, drying, firing and casting conditions.
Match the Silica Sol to the Shell Layer
Foundry performance depends on the entire ceramic-shell system. The binder should be evaluated with the selected refractory, wetting and antifoam additives, environmental conditions and alloy-casting requirements.
Primary Face-Coat Candidate
PC20 provides 30±1% SiO₂ and 10–20 nm particles for trials targeting the mold surface in contact with the casting.
Backup-Layer Candidate
PC10 provides 27±1% SiO₂ and 8–15 nm particles for trials in shell-building layers behind the primary coat.
Monitor the Complete Slurry
Control solids, viscosity or flow cup, pH, temperature, wetting, foam, refractory loading and slurry aging.
Validate Green and Fired Performance
Test drying, intercoat bonding, green strength, fired strength, permeability, thermal behavior and knockout.
Information Needed Before Grade Recommendation
- Casting process: identify investment casting, precision casting or another ceramic-shell foundry process.
- Shell layer: specify primary face coat, transition layer, backup layer or complete shell-system development.
- Refractory system: provide flour and stucco materials, particle sizes, refractory loading and supplier specifications.
- Slurry additives: list wetting agents, antifoams, polymers, biocides or other formulation components.
- Process conditions: provide slurry control method, ambient temperature and humidity, drying time and firing schedule.
- Casting targets: identify alloy, pouring temperature, surface-finish requirement, defect limits and knockout method.
Validate the Slurry, Shell and Casting
Slurry Stability
Monitor pH, solids, viscosity, refractory suspension, foam and property drift during the intended working period.
Coating and Stucco
Check wax wetting, drainage, coat uniformity, stucco coverage, layer thickness and intercoat adhesion.
Shell Performance
Measure drying behavior, green handling strength, fired strength, permeability and resistance to cracking.
Casting Results
Inspect surface finish, inclusions, penetration, fins, cracking, dimensional results and shell removal.
Request Silica Sol for a Foundry Trial
Send the shell layer, refractory system, slurry formulation, drying and firing conditions, casting alloy and defect targets.
Request a Foundry GradeProtect Binder Stability
Packaging Options
Available polyethylene packaging sizes are 25 kg, 250 kg and 1000 kg.
Storage Temperature
Store at 0–40°C and prevent freezing. Temperatures below 0°C can cause irreversible gelation.
Direct Sunlight
Avoid prolonged direct sunlight during storage and transportation.
Container Closure
Keep containers closed to limit evaporation, contamination and precipitation of solid silica particles.
Silica Sol for Foundry FAQ
Which silica-sol grades are available for foundry shell trials?
PC10 and PC20 are the published foundry candidates. PC10 is directed toward backup-layer trials, while PC20 is directed toward primary face-coat evaluation.
Can PC10 and PC20 be used interchangeably?
They have different published solids and particle-size ranges. Each grade should be qualified for the intended layer and refractory system.
Which slurry parameters should a foundry monitor?
Monitor solids, pH, viscosity or flow time, temperature, refractory loading, foam, wetting and changes during slurry aging.
Which shell tests are needed before production use?
Test drying, intercoat bonding, green and fired strength, permeability, thermal behavior, crack resistance and knockout.
How should foundry silica sol be stored?
Store it at 0–40°C, prevent freezing and prolonged sunlight, and keep the package securely closed.
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Applications of Silica Sol for Foundry
PC10 and PC20 can be evaluated as aqueous binders in compatible ceramic-shell foundry systems. Qualification should use the actual refractory, shell sequence, drying, firing and casting conditions.
Primary Face-Coat Slurries
PC20 can be screened with compatible face-coat refractories for wetting, surface reproduction and casting quality.
Backup-Layer Slurries
PC10 can be evaluated for shell buildup, drying, layer bonding and structural performance behind the face coat.
Transition Layers
Foundries can test grade and refractory combinations that bridge the primary and backup shell systems.
Precision Metal Castings
Binder trials can be designed around dimensional requirements, surface finish, alloy temperature and defect limits.
Complex and Thin-Wall Castings
Shell systems should be evaluated for coverage, drying, strength, permeability and resistance to cracking.
Custom Foundry Shell Systems
PC10 and PC20 can be compared using the foundry's refractory materials, slurry controls and firing cycle.
