Foundry & Metal Casting
Bentonite for green-sand moulds
High-plasticity bentonite that supports the strength and stability of green-sand moulds. Low iron content supports cast-iron surface finish. Indicative thermal stability and compressive strength parameters — third-party certification in progress.
Applications
Foundry bentonite bonds silica sand in green-sand moulds used to cast ferrous and non-ferrous metals, producing quality castings. The clay must withstand casting temperatures (>1400 °C for cast iron) while maintaining mould integrity. Low iron oxide in the source clay is advantageous for surface finish and gas evolution control.
Technical characteristics
Typical product specifications — indicative values. Final properties are confirmed for each production batch by laboratory analysis.
| Parameter | Typical value | Method |
|---|---|---|
| Montmorillonite content | ≥ 70% | XRD |
| Green compressive strength | ≥ 80 kPa | AFS |
| Wet tensile strength | ≥ 3.0 kPa | AFS |
| Moisture | ≤ 12% | ASTM D2216 |
| pH | 8.5–10.5 | ASTM D4972 |
| Particle size / fineness | 200 mesh (75 μm) or per customer requirement | ASTM E11 |
Packaging & logistics
- 25 kg paper bags
- 500 kg big bags (FIBC)
- 1 t bags available on request
- Bulk (contact us for volumes)
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Typical product specifications — indicative values. Final properties are confirmed for each production batch by laboratory analysis.