Grade A Lava

Property

ASTM
Method

Designation

Fired

Unfired

Color

Buff-Tan

Gray

Gas/Liquid Permeability

F134B

Atm-cc/sec

Porous

Porous

Density

C 20-97

g/cc

2.30

2.60

Hardness

Mohs

6

2

Water Absorption

C 20-97

%

4.8

2.5

Flexural Strength

PSI

10,000

4,000

Tensile Strength

-

PSI

3,000

1,000

Compressive Strength

-

PSI

25,000

11,000

Linear Coefficient Of Thermal Expansion

C372-96

(@25°C-100°C)
x10^-6/°C

2.9

2.5

(@25°C-600°C)
x10^-6/°C

3.6

3.1

Thermal Conductivity 25°C

C408

W/m-K

1.5

2.0

Max. Use Temperature
(Non Loading)

-

°C

1100

650

-

°F

2000

1200

Dielectric Strength
(1/8" Thick)

D149-97A

V/mil

100

80

Dielectric Constant 1MHz

D150-98

At 25°C

5.3

5.8

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 TESTING IN ACCORDANCE WITH ASTM D2442 FOR CERTAIN COMPOSITIONS. PLEASE CONTACT OUR TECHNICAL STAFF FOR APPROPRIATE MATERIAL AND SPECIFIC TEST RESULTS.