Data Figures Are After Firing |
||||
|---|---|---|---|---|
| TYPE OF MATERIAL | LAVA – Machined from Natural Stone | |||
| PROPERTY | TEST METHOD | UNIT | GRADE “A” Aluminum Silicate | GRADE “M” Magnesium Silicate |
| Water Absorption | ASTM D116-42A | % | 2.5 | 0.97 |
| Specific Gravity | N/A | N/A | 2.3 | 2.8 |
| Density | N/A | lb/in3 | 0.085 | 0.1 |
| Color | N/A | N/A | Pink | Brown |
| Hardness | N/A | Mohs’ Scale | 6 | 6 |
| Tensile Strength | ASTM D116-42 | psi | 3,000 | 2,600 |
| Compressive Strength | ASTM D667-42T | psi | 25,000 | 30,000 |
| Flexural Strength | ASTM D667-42T | psi | 10,000 | 11,000 |
| Softening Temperature | N/A | °F | 1,600 | 1,475 |
| N/A | °C | 2,912 | 2,687 | |
| Linear Coefficient of Thermal Expansion | ||||
| 25-100°C. | N/A | per °C | 2.9×10-6 | 8.2×10-6 |
| 25-600°C. | N/A | per °C | 3.6×10-6 | 8.9×10-6 |
| Te Value | N/A | °C | 700 | 750 |
| Dielectric Strength (Step 60 cycles) | ASTM D667-42T | volts per mil | 100 | 100 |
| Dielectric Constant | Jan-1-10 | @1 MHz | 5.3 | 5.5 |
| Power Factor | Jan-1-10 | MHz | 0.01 | 0.006 |
| Loss Factor | Jan-1-10 | MHz | 0.053 | 0.033 |
| PRINCIPAL USES | N/A | N/A | Machined parts with close tolerances and good dielectric properties. Very low coefficient of thermal expansion. Can be supplied in larger sizes than other grades of Lava. | Machined parts for Electrical Equipment and Appliances where close tolerances are required. |
| bulk density | temperature | temperature | specific heat | diffusivity | conductivity | |
|---|---|---|---|---|---|---|
| Sample | ρ@ 25°C | N/A | N/A | Cp | α | λ |
| Grade A Lava- | ||||||
| (g/cm³) | (°C) | (°F) | (J/g · K) | (cm²/s) | (W/m · K) | |
| Hard | 2.31 | 1093 | 2000 | 1.39 | 0.00619 | 1.98 |
| L-3 Steatite | 2.19 | 1204 | 2200 | 1.53 | 0.00638 | 2.14 |
