Steatite Ceramics
Material Specification
| Material Properties |
Unit | Normal Porcelain |
Dense Cordierite |
Steatite Grade L-3 |
Steatite Grade L-5 |
Cordierite Porcelain |
Cordio-Sillmanite Refactory |
Cordierite Refractory |
High Alumina Porcelain |
Alumina Ceramic |
| Equivelent to DIN EN 60672 |
C-112 | C-210 | C-220 | C-221 | C-410 | C-510 | C-511 | C-610 | C-780 | |
| PHYSICAL PROPERTIES |
||||||||||
| Colour | Cream/ White/ Grey | Off -White | Off White | Off -White satin smooth | White | White/ Buff | Brown | Off .White | Brown | |
| Specific Geavity |
2.3 | 2.2 | 2.6 | 2.7 | 2.3 | 1.8-1.9 | 1.9 | 2.6 | 3.2 | |
| Water Absorbtion |
% | Less than 1 | Less than 2% | 0.5 | 0 | 0 | 22-24 | 15-20 | 0 | 0 |
| Flexural Strength |
kg /cm 2 | 800 | – | 1200 | 1400 | 800 | 300 | 300 | 1200 | 2500 |
| Compressive Strength |
kg /cm2 | 2500 | 2500 | 4000 | 5000 | 2500 | 800 | 2000 | 3500 | 16000 |
| Young’s Modulus |
kg/cm2X106 | 0.7 | – | 0.8 | 1 | 0.75 | – | – | 1 | 2 |
| Hardness | Moh’s Scale | 6-6.5 | – | 6–7 | 6–7 | 6-6.5 | 7–8 | – | 7 | 8 |
| THERMAL PROPERTIES |
||||||||||
| Co-officent of Thermal Expantion (30-600 degree Celsius) | x 10-6 / ° C | 6–7 | 4–5 | 6–7 | 6–7 | 6–7 | 4–5 | 4–5 | 5–6 | 6–8 |
| Thermal Shock Resistance Down Shock | ° C | |||||||||
| Thermal Conductivity |
W/M ° K | 1.4-2.5 | – | 2–3 | 2–3 | 1.2-2.5 | 1.3-1.8 | 1.3-1.8 | 2–6 | 10–16 |
| Safe Operation Temp. |
° C | 600 | 1000 | 1000 | 1050 | 600 | 1300 | 1000 | 1000 | 1100 |
| Max.Temp. Withstanding Capacity |
° C | 1200 | 1200 | 1200 | 1200 | 1200 | 1350 | 1200 | 1200 | 1200 |
| ELECTRICAL PROPERTIES |
||||||||||
| Dielectric Strenghth (20 ° C ) |
KV/mm | 8 | – | 10 | 20 | 10 | – | – | 10 | 18 |
| Dielectric Constant (20 ° C::1MHz ) |
5 | – | 5.5 | 6.5 | 6 | – | – | 7 | 8 | |
| Volume Resistivity (20° C) |
Ohm-cm | 10 11 | – | 10 11 | 10 11 | 10 10 | – | – | 10 11 | 10 12 |
| CHEMICAL COMPOSITION N.P. |
||||||||||
| SiO2 | % | 70 | 70-75 | 60-65 | 60-65 | 70-72 | 45-50 | 55-57 | 40-45 | – |
| AI2 O3 | % | 20 | 15-17 | 15-17 | 6–7 | 23-25 | 45-50 | 30-32 | 45-50 | app.80 |
| Mg o | % | – | 10–12 | 18–20 | 25-27 | 1–3 | 1–2 | 7–8 | – | – |
| APPLICATION | ||||||||||
| LT Insulator, Lamp, Holder, Media Lining Block etc. | Ferrules High heart Shock Items. | MCB Plates Beads, Insulators, Lamp Holders. | HRC Sq.Bodies, Band Heaters , End Seabush Griding Media, Liners. | HRC Round Bodies, Wire Wound, Resistor, Tube Different Special Shop Insulators, Media. |
Klin Furniture Hot plates, Heating Element Support. | Bobbins, Multi Hole, Tubes Heating Element Support. | High/Low Voltage Electrical Application Resistance Formers | Coil Formers, Wear Resistant Parts. |