USTC 999  - A very high density, fine grain size, 99.9% pure body. This body has superior wear resistance, high strength, chemical inertness and optical surface finish capability. It is particularly well suited for high abrasive or corrosive applications where precision structures with extended life characteristics are used.

USTC 998  - A fine grain, high density, 99.8% ceramic body with exceptional wear, corrosion and high mechanical strength properties. A lower cost alternative to our 99.9% alumina body for use in many applications.

USTC 995  - A medium grain size 99.5% pure body, easier to grind and polish. Well suited for insulator, metallized and microwave applications

USTC 980  - A general purpose 98.0% ceramic body of good durability and electrical resistivity. Relatively easy to grind and generally used for metallization.

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Table of USTC Composition Properties

Properties

Test

Units

USTC 980

USTC 995

USTC 998

USTC 999

Color

white

ivory

ivory

ivory

Al2O3 Content

-

%

98.0%

99.5%

99.8%

99.9%

Crystal Size

ASTM E384

Micron

2-25

2-45

.5-25

3

Hardness

ASTM E384

KNOOP

1500

1600

-

-

ASTM E18

Rockwell 45N

-

-

-

87

Specific gravity

ASTM E384

Gm/cc

3.7-3.8

3.8-3.9

3.93

3.95

Porosity

ASTM E383

% H2O Absorbtion

0.0

0.0

0.0

0.0

Compressive Strength

ASTM C773

KPSI

325

370

390

550

Flexural Strength

ASTM F394

KPSI

43

45

52

60

Tensile Strength

ACMA #4

KPSI

28

32

30

32

Youngs Modulus

ASTM C848

PSI x 106

49

53

56

56

Shear Modulus

18

22

23

20

Poissons Ratio

0.21

0.21

0.23

0.23

Thermal Expansion

°C

x 10-6

x 10-6

-

x 10-6

ASTM C372

25-200

6.74

6.40

-

6.50

25-1000

8.37

8.14

7.8

8.60

Dielectric Strength

ASTM D149

ACV/MIL

230

215

269

215

Dielectric Constant

ASTM D150

1 MHz

9.3

9.5

9.5

9.9

10 GHz

9.3

9.6

9.6

10.0

Dissipation Factor

ASTM D150

1 MHz

.0003

.0002

.0002

.0002

10 GHz

.0003

.0007

.0007

.0007

Loss Index

ASTM D150

1 MHz

.0028

.0019

.002

.002

10 GHz

.0023

.0007

-

.0007

Volume Resistivity

ASTM D257

°C

Ohm-cm

Ohm-cm

Ohm-cm

Ohm-cm

25

>1014

>1014

>1014

>1014

100

>1014

>1014

>1014

>1014

300

1.0x1011

8.9x1013

>1013

>1013

500

3.7x108

6.9x1010

2.6x1012

>1012

700

3.5x107

1.0x109

-

-

 

 

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