Alumina, Macor and Materials Chart From Technical Products, Inc.

PO Box 189
Hubertus, WI 53033
Phone: 262-335-3635
Fax: 262-335-3606
Email: tpi@technicalproductsinc.com

Ceramic Material Property Data

Properties

Units

Test

Corning
Macor®

Alumina
99.5%

Alumina
99.9%

Boron
Nitride

Boron Nitride
Grade A

Boron Nitride Grade AX05

Boron Nitride Grade HP

Graphite

Lava, Grade A

Mycalex
400

Mycalex
500

Mycalex
1100

Mullite

Pyrex®
(7740)

Quartz
(GE124)

Sapphire

Silicon

Silicon
Carbide

Silicon Nitride (Hot Pressed)

Steatite L-5

Zirconia
YTZP

Zirconia
Y-PSZ

Zirconia
ZrO₂ /MgO

P
H
Y
S
I
C
A
L

Chemical Formula

-

-

glass ceramic

Al₂O₃

Al₂O₃

BN

95% BN

99 + BN

95% BN

C

Al₂(Si₄0₁₀)(OH)₂

-

-

-

3Al₂O₃-SiO₂

borosilicate glass

SiO₂

a-Al₂O₃

Si

a-SiC

Si₃N₄

H2Mg3(SiO₃)4

ZrO₃

-

ZrO_{2 /MgO}

Density

g/cm³

ASTM C20

2.52

3.7-3.97

3.93

2.28

>1.90

>1.80

>1.90

2.25

2.30

2.5

2.7

2.8

2.80

2.23

2.21

3.97

2.33

3.21

3.31

2.71

6.02

5.5-6.0

5.72

Color

-

-

white

ivory / white

orangish
pink

white

white

white

white

black

pink

dark gray

light gray

cream

tan

white / transparent

white / transparent

white / transparent

gray

dark gray

dark gray

buff

ivory

ivory

yellow

Crystal Structure

-

-

random

hexagonal

-

hexagonal

hexagonal

hexagonal

hexagonal

hexagonal

random

-

-

-

orthorhombic

random

hexagonal

trigonal

cubic

hexagonal

hexagonal
(alpha &

)

hexagonal

tetragonal

-

-

Water Absorption

% @ R.T.

ASTM C373

0.0

0.0

0.0

0.0-1.0

-

-

-

0.5-3.0

2.5

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0

0.0-0.02

0.0

-

0.0

Hardness

Moh's

-

4.5

9

-

2

5

2

4

1.0-1.5

6

-

-

-

8

-

7

9

7

9-10

9

7.5

6.5

>8

-

Hardness

knoop^(kg/mm1)

Knoop 100g

250

2000

2000

25-205

15.51 - 24.19
knoop^(kg/mm2)

-

-

-

500

-

-

-

1450

418

>600

2200

1150

2800

2200

-

1600

1120-1300 KG/MM^2

-

M
E
C
H
A
N
I
C
A
L

Compressive Strength

MPa @ R.T.

ASTM C773

50 x 10³ psi
345 MPa

2070-2620

510
kpsi

23.5

20780 (27060)
@ 25ºC

125

25

96

172.5

45,000 psi

40,000 psi

32,000 psi

551

N/A

650-1100

2000

120

1725-2500

689-2760

621

2500

1760-2000

1500-2000

Tensile Strength

MPa @ R.T.

ACMA Test #4

90

260-300

44
kpsi

2.41
^(1000ºC)

-

-

-

4.8

20.7

6000 psi
41.4 MPa

6000 psi
41.4 MPa

5000 psi
75.9 MPa

103.5

N/A

48

250-400

113

310

360-434

62

248

300-450

-

Modulus of Elasticity
^{(Young's Mod.)}

GPa

ASTM C848

9.7x10⁶psi
66.9 GPa

394

55
x 10⁶ psi

675

-

17-71

40-60

4.8

-

11.0 psi
75 GPa

12.0 psi
82.7 GPa

10.6 psi
73.1 GPa

150

64

70

250-400

112

476

317

138

207

140-10

-

Flexural Strength (MOR)

MPa @ R.T.

ASTM F417

94
13.6 x 10^{3 psi}

310-379

50-60

51.8

11000 (16400)
@ 25 ºC
900 (1380)
@ 1500 ºC

2600 (3100)
@ 25 ºC
6200 (11000)
@ 1500 ºC

6430 (8730)
@ 25 ºC
1710 (2470)
@ 1500 ºC

50

69

89.6 MPa
13,000 psi

86.2 MPa
12,500 psi

89.6 MPa
11,000 psi

170

69

80

760-1035

~300

324

679-896

140

900

400-1020

489

Poisson's Ratio

-

ASTM C818

0.29

0.27

0.19

0.05

-

-

-

-

-

.25

.25

.25

0.25

0.20

0.17

0.29

0.28

0.19

0.23

-

0.32

0.23-0.31

-

Fracture Toughness

Mpa x m^1/2

Notched Beam Test

1.53

4.50

4-5

2.60

-

-

-

-

-

-

-

-

2.0

0.77

-

1.89

3.0-6.0

4.0

5.0-8.0

-

13.0

6.0-12.0

7.9 MPa²

T
H
E
R
M
A
L

Max. Use Temperature
^{(*denotes inert atm.)}

ºC

No load cond.

1000

1750

1900

985

>1000

>1800

>1000

3650

1150

400

500

595

1700

490

1200

~2000

1350

1400

1500

1425

500

-

1000

Thermal Shock Resistance

ΔT (ºC)

Quenching

25-100

200

200

>1500

-

-

-

200-250

-

-

-

-

300

100

>1400

200

-

350-500

750

190

280-360

-

-

Thermal Conductivity

W/m=K @ R.T.

ASTM C408

1.8

35

34.1

20.00

30

70 - 130

30

24

1.98

.87

1.15

1.32

3.5

1.1

1.4

40

125

41

27

2.9

2.2

-

1.5-2.5
(W m^-1
K^-1)

Coefficient of Linear Thermal Expansion

^µm/m-ºC^{(-25¡C through ²1000ºC)}

ASTM C372

6.3-9.7

8.4

7.6
x10^-6 /ºC

1.0-2.0

2

0

0

8.39

3.6

12.5 (10x-6) /ºC 25ºC
11.00 (10x-6) /ºC 350ºC

11.57 (10x-6) /ºC 25ºC
10.53 (10x-6) /ºC 350ºC

10.48 (10x-6) /ºC 25ºC
9.74 (10x-6) /ºC 350ºC
9.39 (10x-6) /ºC 500ºC

5.3

3.25
^{(through 300ºC)}

0.45

7.9-8.8

2.49-.44

5.12

3.4

7.0

11.0

-

5-10
@ 20 - 1000C ( x10^-6 K^-1)

Specific Heat

cal/g-ºC @ R.T.

ASTM C351

0.19

0.21

0.20

0.19

1.610
@ 700 ºC (J/gºC)

-

-

0.16

0.20

0.12

0.12

0.11

0.23

0.18

0.16

0.18

0.18

0.15

0.17

0.22

0.10

-

400-500
@ 25C (JK^-1 kg^-1)

E
L
E
C
T
R
I
C
A
L

Dielectric Constant

1Mhz @ R.T.

ASTM D150

6.03

9.6

9.8

4.08

4.0

4.0

4.0

-

5.3

6.7

6.9

6.8

6.0

4.6

3.8

9.3-11.4

11.8

10.2

7.0

6.3

26 @100kHz

-

-

Dielectric Strength

kV/mm

ASTM D116

40

15.0

230
ac V/mill

374.0

>40

>40

>40

-

0.1

730 V-mil
28.7 kV/mm

530 V-mil
20.9 kV/mm

420 V-mil
16.5 kV/mm

9.8

0.5

25-40

15-50

-

-

17.7

9.3

9.0

20-100

-

Electrical Resistivity

Wcm @ R.T.

ASTM D1829

>10¹⁷

10¹⁴

-

10¹³

>10¹⁴

>10¹⁴

>10¹⁴

7 x 10^-3

10¹⁴

-

-

-

10¹³

8 x 10¹⁰

6 x 10¹⁰

10¹⁷

10^-3

10⁸

10¹³

10⁴

>10¹³

-

-

Note: Resistance to water over time (Macor®)

H₂O	7.6	1 day*	95ºC	0.01
		3 days*	95ºC	0.07
		7 days*	95ºC	9.4
* Water not freshened daily		3 days**	95ºC	0.06
** Water freshened daily		6 days**	95ºC	0.11

The information supplied is not to be taken as a warranty or representation for which Technical Products, Inc. assumes legal responsibility is offered solely for your consideration, investigation and
verification. All risk of use, singly or in combination with other products,whether or not in accordance with the instructions, directions or suggestions is borne by the user.

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Last updated: 6/23/2009