
Ceramic
Balls 

Ceramic Balls
Balls manufactured from ceramic materials are extremely resistant
to corrosion and abrasion, and offer excellent performance
characteristics. TRD Specialties offers a variety of precision
ceramic balls, each providing its own unique corrosion and
heat resistant qualities. Alumina Oxide Balls
Alumina oxide ceramic balls have proven performance in wear,
heat and corrosive environments as well as in maintaining dimensional
stability at temperatures up to 2000 F. Alumina resists oxidation
and is tolerant to water, salt solutions, and many chemicals
and acids.
Alumina
Oxide Balls Properties 
Compressive Strength 
330,000 psi 
Maximum Useful Temperature 
3180°F 
Thermal Conductivity 
35.6 W/m °C (@ 20°C), 6.3W/m °C (@ 800°C) 
Thermal Expansion 
4.6 x 10
to the 6th power /°F 
Electrical Resistivity 
>10 to the 14th power
Ohm/cm (@25°C), 2.5 x 10
to the 6th power Ohm/cm (@900°C) 
Young's Modulus of Elasticity 
54 x 10 to the 6th power
psi 
Hardness 
1365 Vickers 
Density 
.139 lbs/inch to the
3rd power 
Ruby Sapphire Balls
Ruby Sapphire balls are opaque red in color and frequently
used in gauging devices. They are also suited for use in optical
and light refractive applications, such as lasers. Ruby Sapphire
is resistant to most corrosive material even at very high temperatures.
Ruby Sapphire’s maximum useful temperature is 3250° F.
Ruby Sapphire
Ball Properties 
Compressive Strength 
300,000 psi 
Maximum Useful Temperature 
3180°F 
Thermal Conductivity 
.086 Cal/sec cm °C 
Thermal Expansion 
3.2 x 10 to
the 6th power / °F 
Electrical Resistivity 
10 to the 9th power Ohm/cm
(@500°C), 10 Ohm/cm (@2000°C) 
Young's Modulus of Elasticity 
50 x 10 to the 6th power
psi  55 x 10 to
the 6th power psi 
Hardness 
15701800 Vickers 
Density 
.144 lbs/inch to the
3rd power 
Silicon Nitride Balls
Silicon Nitride balls are a popular choice for bearing designers
and other high precision product applications Long life makes
this material very suitable for aviation applications. Silicon
Nitride is antimagnetic and resistant to corrosion by most
substances.
Silicon
Nitride Ball Properties 
Compressive Strength 
341,300 psi 
Maximum Useful Temperature 
2552 °F 
Thermal Conductivity 
.07 Cal/sec cm °C 
Thermal Expansion 
1.78 x 10
to the 6th power /°F 
Electrical Resistivity 
>10 to the 6th power
Ohm/cm (@500°C), 10
to the 5th power Ohm/cm (@ 2000°C) 
Young's Modulus of Elasticity 
47 x 10 to the 6th power
psi 
Hardness 
1500  2000 Vickers 
Density 
.116 lbs/inch to the
3rd power 
Zirconia Balls
In certain applications Zirconia balls operate two
to three times longer than metal or carbide. Zirconia balls
are inert
to corrosive materials with the exception of hydrofluoric acid
and hot, concentrated sulfuric acid. Zirconia has a maximum
useful temperature of 1800° F.
Zirconia
Ball Properties 
Compressive Strength 
794,837 psi 
Maximum Useful Temperature 
1800 °F 
Thermal Conductivity 
0.007 Cal/cm, Sec 0 
Thermal Expansion 
10.9 x 10 to
the 6th power / °C 
Electrical Resistivity 
2.2 x 10 to the12th power
cm 
Young's Modulus of Elasticity 
30.6 x 10 to the 6th
power, 21700 kgr/mm to the
2nd power 
Hardness 
1250 kgr/mm to the 2nd
power 
Density 
.219 lbs/inch to the
3rd power 
Need more info on Ceramic balls?
Other Ball
Types that TRD Provides: 


