KER Comparisons
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| Material Properties | Unit | Porcelain | Steatite | Steatite | Cordierite | Cordierite | Cordierite |
Porcelain w/Alumina |
Alumina | Alumina | Alumina | Alumina |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Equivalent to DIN 40685 CEI 672 | C-112 | C-220 | C-221 | C-410 | C-410-HT | C-511 | C-610 | C-780 | C-786 | C-795 | C-799 | |
| Composition | SiO2 (%) | 65 | 50 | 60 | 60 | 55 | 50 | 40 | -- | -- | -- | -- |
| AI2O3 (%) | 30 | -- | -- | 30 | 35 | 35 | 50 | 85> | 94> | 96 | 99 | |
| MgO (%) | -- | 20 | 25 | 3-5 | 3-5 | 10 | -- | -- | -- | -- | -- | |
| Physical Properties | ||||||||||||
| Colour | White | White | White | White | White | Brown | White | Brown | White | White | White | |
| Specific Gravity | 2.3 | 2.5 | 2.7 | 2.3 | 2.4 | 1.9 | 2.6 | 3.2 | 3.5 | 3.8 | 3.9 | |
| Water Absorption | % | 0 | 0 | 0 | 0 | 0 | 20 | 0 | 0 | 0 | 0 | 0 |
| Flexural Strength | KG/CM2 | 800 | 1200 | 1400 | 600 | 800 | 250 | 1200 | 2000 | 2500 | 2800 | 3200 |
| compressive Strength | KG/CM2 | 1500 | 2500 | 3000 | 2000 | 4000 | 1200 | 3500 | 6000 | 12000 | 18000 | 20000 |
| Young's Modulus | KG/CM2x106 | 0.7 | 0.8 | 1.1 | 0.75 | 0.8 | -- | 1 | 2 | 2.2 | 3 | 3.1 |
| Hardness | Moh s | 6-6.5 | 6-7 | 6-7 | 6-6.5 | 6.5-7.0 | -- | 7 | 8 | 9 | 12 | 12 |
| Thermal Propierties | ||||||||||||
|
Co-efficient of Thermal Expantion 20-800°C |
10-6/°C | 5-6 | 4-7 | 7-9 | 2-4 | 2-4 | 4-6 | 5-7 | 6-8 | 6-8 | 7-8 | 8-10 |
|
Thermal Shock Resistance Down Shock |
°C | 200 | 190 | 190 | 250 | 300 | 350 | 300 | 160 | 160 | 160 | 200 |
| Thermal conductivity | W/M0K | 1.4-2.5 | 2-3 | 2-3 | 1.2-2.5 | 1.2-2.5 | 1.3-1.8 | 2-6 | 10-16 | 14-24 | 11-30 | 15-30 |
|
Max.Temp.Wth Standing Capacity |
°C | 1000 | 1000 | 1000 | 1000 | 1000 | 1100 | 1200 | 1000 | 1300 | 1300 | 1500 |
| Electrical Properties | ||||||||||||
| Dielectric Strenght | KV/mm | 8 | 10 | 15 | 10 | 10 | -- | 10 | 12 | 15 | 17 | 18 |
| Dielectric Constant | Ohm-cm | 5 | 5.5 | 6.5 | 6 | 6 | -- | 7 | 8 | 9 | 9 | 10 |
| Volume Resisistivy | 1011 | 1011 | 1011 | 1010 | 1010 | -- | 1011 | 1012 | 1012 | 1012 | 1012 |
NOTE: The information set forth herein is offered for comparison only, and is not to be considered as absoulte engineering data,
or constituting a warranty or representation for which we assume legal responsibility.
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