Overview
Foundry, the oldest method, bentonite is used in preparation of moulding sand particularly for green sand molding, steel and non-ferrous casting.
We selectively mined and process with necessary additives to achieve good thermal conductivity at higher temperature. Our processed bentonite has numbers of characteristics such as it develops good green and dry strength and better flow, high thermal stability, easy to develop sharp and strong mold edge and corners, excellent ramability, good mold strength in HPML, develop good strength at lower additions, etc
Mixing ratio depends on sand fineness and it quality. Clay particles and impurities of sand will affect Green Strength properties.
SPECIFICATIONS FOR FOUNDRY GRADE BENTONITE POWDER
GRADE: BENTO – 28
Physical Properties
| Parameters | Specifications |
| 1. pH | 8.5 – 10 |
| 2. Free Swell Value | 28 – 30 ml |
| 3. MBA value | 370 mg/gm min |
| 4. Moisture | 14% max |
| 5. Gel Time | Instant |
| 6. Gel Index | 60 ml min |
| 7. GCS | 10 – 12 psi |
| 8. Particle Size > 200 BSS Mesh | 80% min |
Chemical Properties
| Parameters | Specifications |
| LOI | 8 – 10% |
| SiO2 | 48 – 54% |
| Fe2O3 | 14 – 18% |
| Al2O3 | 14 – 17% |
| CaO | 1.5 – 2.8% |
| MgO | 2 – 3% |
| Na2O | 2.2 – 3% |
GRADE: BENTO – 30
Physical Properties
| Parameters | Specifications |
| 1. pH | 8.5 – 10 |
| 2. Free Swelling Value | 30 ml min |
| 3. MBA value | 400 mg/gm min |
| 4. Moisture | 14% max |
| 5. Gel Time | Instant |
| 6. Gel Index | 70 ml min |
| 7. GCS | 12 – 14 psi |
| 8. Particle Size > 200 BSS Mesh | 80% min |
Chemical Properties
| Parameters | Specifications |
| LOI | 8 – 10% |
| SiO2 | 48 – 54% |
| Fe2O3 | 14 – 18% |
| Al2O3 | 14 – 17% |
| CaO | 1.5 – 2.8% |
| MgO | 2 – 3% |
| Na2O | 2.2 – 3% |