Lava Facts & Data

Electrical & Mechanical Data

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     2.3 2.8
Density   lb/in3 0.085 0.1
Color     Pink Brown
Hardness   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   °C
°F
1,600
2,912
1,475
2,687
Linear Coefficient of Thermal Expansion
25-100°C.
25-600°C
  per °C 2.9x10-6
3.6x10-6
8.2x10-6
8.9x10-6
Te Value   °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     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.

Laser Flash Thermal Conductivity Results

Sample bulk density
ρ@ 25°C
(g/cm³)
temperature

(°C)
temperature

(°F)
specific heat
Cp
(J/g · K)
diffusivity
α
(cm²/s)
conductivity
λ
(W/m · K)
Grade A Lava-
Hard
2.38 1204 2200 1.42 0.00687 2.32
Grade A Lava 2.31 1093 2000 1.39 0.00619 1.98
L-3 Steatite 2.19 1204 2200 1.53 0.00638 2.14