With time, as the technology is moving ahead, whether in the field of pharmaceuticals, medical, food and cooking industry, industrial or Health care industries, something in each field has changed in order to cope up with the technology. Bottom pouring sets (BP sets) are shapes made from different refractory grog, plastic fire clays, and non plastic clays. The fractions of these raw materials are pugged and are mixed for complete homogeneous mixing.
The mixture obtained is then pressed in high capacity presses to give it desired shapes and sizes. These sets are generally made in two qualities, 30% alumina and 40% alumina. If required, these sets can also be made in high alumina grades. The sizes available for different qualities of Bottom Pouring Sets are Duplex 3 x 4, Duplex 3.5 x 4.5, Duplex 4 x 5, Duplex 5 x 6 and H Plate. The pressed shapes are later fired in tunnel kiln at very high temperatures of nearly 1300 C.
| GENERAL SPECIFICATION | ||
|---|---|---|
| 30% Alumina(IS:6) | 40% Alumina (IS:8) | |
| SiO2 (%) | ≥65 | ≥65 |
| Bulk Density (g/cm3) | 1.6~1.8 | 1.0~1.3 |
| Cold Crushing Strength (Mpa) | ≥15 | ≥10 |
| Thermal Conductivity (w/m*k) | ≤0.65 | ≤0.45 |
| Water Absorption (%) | ≤15 | Working face 5 |
| Acid Proof Rate (%) | ≤98 | ≤97 |
| Service Temperature (℃) | ≤1000 | ≤1000 |
| Safe Working Temperature | 1400?C | 1450?C |
| Bulk Density | 2 gms/cc | 2 gms/cc |
| Cold Crushing Strength; | 200 kg/cm2 | 250 kg/cm2 |
| Appartment Porosity | 30% max. | 30% max. |
| P.C.E (Orton Cone) | 30 | 32 |
| RUL | 1300 ta0 C min. | 1400 ta0 C min. |
| LC at 1350?C for 5 hrs.; | 1% | 1% |
| Size Tolerance | +/- 2 % | +/- 2% |
| Alumina as Al2O3 | 30% min. | 40% min. |
| Iron as Fe | 2.5 % max. | 2.5 % max. |
| Silica as SiO2 | 65% max. | 57% max. |
| Alkalis | Trace | Trace |
