Ceramic Resistors
U.S. Resistor utilizes 2 different base materials to manufacture our Ceramic Resistor Disc / Washer and Rod / Tubes.
Our original material has Zirconium Silicate as the base material and has the prefix of 83-xxxx to designate for this material.
We now offer Alumina as a base material and has the prefix of 85-xxxx to designate for this material. The Alumina offers a lighter weight material which can be significant on many applications but offers the same electrical characteristics as the original Zirconium Silicate material.
Ceramic resistors are manufactured from a sintered body of ceramic material, with conductive particles distributed throughout the matrix, to produce a resistor that is 100% active and non-inductive. Ceramic resistors are chemically inert. They can withstand high-energy and high-voltages at high temperatures, such as those encountered in the protection of high voltage surge equipment, discharge banks, and in high frequency radiation suppression.
Resistivity Range | 83 – Zirconium Base | 0.8 to 4,000 Ohm-in |
85 – Alumina Base | 2 to 4,000 Ohm-in | |
Maximum Steady State Power Density |
| 12 watts/in³ |
Maximum Transient Energy Density |
| 4,920 joules/in³ |
Maximum Voltage Gradient |
| 10 kV/in |
Maximum Rate of Power Injection |
| 150,000 watts/sec/in³ |
Maximum Rate of Current Injection |
| 1,000 amps/in² - Contact Area |
Maximum Operating Temperature |
| 250° C |
Voltage Coefficient |
| - 0.3% to - 7.5% /kv/cm |
Temperature Coefficient |
| - 0.03% to - 0.16%/°C |
Heat Dissipation |
| 2.86 watts/in² |
Thermal Conductivity |
| 0.03 cal / cm. sec 0C |
Specific Heat |
| 0.2 cal/gm/°C |
Coefficient of Thermal Expansion |
| 4 x 10-6 |
Heat Capacity |
| 8.7 cal/°C/in³ |
Density (Nominal) | 83 – Zirconium Base | 2.55 g/cc |
85 – Alumina Base | 2.30 g/cc |
U.S. Resistor, Inc. manufactures non-inductive, special purpose and industrial resistors that have found uses in many applications, including high power and high energy surge applications, such as energy transmission and distribution systems, to wind power systems.
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Contact us
1016 DeLaum Road
St. Marys, PA 15857
814.781.7679