Properties

Units

Test

Value

Physical

Chemical Formula

-

-

3Al₂O₃-SiO₂

Density,?ρ

g/cm³

ASTM C20

2.80

Color

-

-

tan

Crystal Structure

-

-

orthorhombic

Water Absorption

% @R.T.

ASTM C373

0.0

Hardness

Moh's

-

8

Hardness

knoop (kg/mm²)

Knoop 100g

1450

Mechanical

Compressive Strength

MPa @ R.T.

ASTM C773

551

Tensile Strength

MPa @ R.T.

ACMA Test #4

103.5

Modulus of Elasticity
(Young's Mod.)

GPa

ASTM C848

150

Flexural Strength?(MOR)

MPa @ R.T.

ASTM F417

170

Poisson's Ratio,?ν

-

ASTM C818

0.25

Fracture Toughness, K_Ic

MPa x m^1/2

Notched Beam Test

2.0

Thermal

Max. Use Temperature
(* denotes inert atm.)

?C

No load cond.

1700

Thermal Shock Resistance

ΔT (?C)

Quenching

300

Thermal Conductivity

W/m-K @ R.T.

ASTM C408

3.5

Coefficient of Linear Thermal Expansion,?α_l

?m/m-?C (~25?C through ±1000?C)

ASTM C372

5.3

Specific Heat, c_p

cal/g-?C @ R.T.

ASTM C351

0.23

Electrical

Dielectric Constant

1MHz @ R.T.

ASTM D150

6.0

Dielectric Strength

kV/mm

ASTM D116

9.8

Electrical Resistivity

Ω cm @ R.T.

ASTM D1829

10¹³

SiO₂%

25-38

Al₂O₃%

50-65

MgO%

?< 1.0

K₂O+Na₂O₃%

< 1.0

Fe₂O₃%

< 1.5