Grade A Lava

Property

ASTM
Method

Units

Fired Lava

Unfired Lava

Color

-

-

buff-tan

gray

Gas Permeability

-

-

porous

porous

Density

C 20-97

g/cc

2.30

2.60

Hardness

-

Mohs Scale

6

2

Water Absorption

C 20-97

%

3

2.5

Flexural Strength

F 417-87

psi

10,000

4,000

Tensile Strength

-

psi

3,000

1,000

Compressive Strength

-

psi

25,000

11,000

C.T.E., 25 - 100°C

C372-96

x10^-6/°C

2.9

2.5

C.T.E., 25 - 300°C

-

-

3.3

-

C.T.E., 25 - 600°C

-

-

3.6

3.1

Thermal Conductivity 25°C

C408

W/m-K

2

-

Max Use Temperature
(Non-Loading)

-

°F

2000

1200

°C

1100

650

Dielectric Strength
(.125" Thick)

D149-97A

V/mil

100

80

Dielectric Constant
@1MHz

D150-98

-

5.3

5.8

Note: The information in this data sheet is for design guidance only. STC does not warrant 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 qualification for certain compositions, in accordance with ASTM D2442. Please consult our technical staff for appropriate material and specifc test results.

Note: In addition to the above compositions, STC offers a wide range of alternative materials. Please contact one of our applications engineers for material requirements that may not be shown above.