Grade A Lava

Property

Designation

Unfired

Fired

Color

Grey

Buff-Tan

Hardness

Mohs

2

6

Water Absorption

%

2.7

2.5

Specific Gravity

2.5

2.3

Tensile Strength

PSI

1,000

3,000

Compressive Strength

PSI

11,000

25,000

Flexural Strength

PSI

4,000

10,000

Maximum Operating Temperature Under Non Loading Conditions

°C

650

1,100

°F

1,200

2,000

Linear Coefficient Of Thermal Expansion

(@25 °C - 100 °C)
x10^-6 /°C

2.5

2.9

(@25 °C - 600 °C)
x10^-6 /°C

3.1

3.6

Dielectric Strength
(1/4" Thick)

VOLTS/MIL

80

100

Dielectric Constant

At 25 °C & 1 mhz

5.8

5.3

Loss Factor

At 25 °C & 1 mhz

0.06

0.05

Te Value

Temp °C @ which one cm³ of material has a mega-ohm of resistance

NOTE: THE INFORMATION IN THIS DATA SHEET IS FOR DESIGN GUIDANCE ONLY. STC DOES NOT WARRANTY THIS DATA AS ABSOLUTE VALUES. FORMING METHODS AND SPECIFIC GEOMETRY COULD AFFECT PROPERTIES. SLIGHT ADJUSTMENTS CAN BE MADE TO SOME OF THE PROPERTIES TO ACCOMMODATE SPECIFIC CUSTOMER REQUIREMENTS. MOST OF THE DENSE MATERIALS IN THE TABLE ARE RESISTANT TO MECHANICAL EROSION AND CHEMICAL ATTACK. STC HAS PERFORMED ASTM TESTING AND MIL-I-10B QUALIFICATION FOR CERTAIN COMPOSITIONS. PLEASE CONTACT OUR TECHNICAL STAFF FOR APPROPRIATE MATERIAL AND SPECIFIC TEST RESULTS.