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In short: choose a mica band heater when compact size, customization and cost are priorities. Choose a ceramic band heater when easier installation, higher operating temperatures and repairability are more important.
At first glance, mica band heaters may seem superior, but ceramic band heaters are generally easier to install. Over time, machine surfaces can become dirty, damaged or rough. This can create air pockets between a mica band and the barrel, reducing contact with the heated surface. Poor contact lowers heat transfer and can shorten the life of a mica band. Ceramic bands are less affected because they transfer heat by infrared radiation through the air.
Whichever type is best suited to the application, Volton manufactures custom mica and ceramic band heaters to meet specific dimensions, wattage and operating requirements.
Mica vs. ceramic band heaters: what are the differences?
| Criterion | Mica | Ceramic |
|---|---|---|
| Heat transfer | Conduction | Infrared radiation |
| Internal temperature | Approx. 480 °C max. | Approx. 900 °C max. |
| Customization | Highly customizable | More limited |
| Thickness | Approx. 0.12 to 0.19 in. | Approx. 0.40 to 0.75 in. |
| Installation | Close surface contact required | More tolerant of surface irregularities |
| Cost and weight | Lower cost and lighter | Higher cost and thicker |
How are mica and ceramic band heaters constructed?
Mica band heaters
Mica band heaters are made from a resistive ribbon or wire wound around a mica sheet. Two or more mica sheets provide electrical insulation. The assembly is enclosed in a metal sheath and formed to the required shape.
Mica bands transfer heat by conduction directly to the surface being heated. Their internal temperature is limited to around 480 °C.
Main components of a mica band heater.
Ceramic band heaters
Ceramic band heaters are made from a resistive wire coiled and inserted into ceramic pieces that provide electrical insulation. The ceramic assembly is attached beneath a sheet metal cover and formed to the required shape.
Ceramic band heaters transfer heat by infrared radiation through the air to the surface being heated and theoretically require no physical contact. Their internal temperature is limited to around 900 °C.
Main components of a ceramic band heater.
What are the advantages of mica band heaters?
- Heat transfer: because mica band heaters transfer heat by conduction, their surface temperature should typically be 5 to 50 °C above the temperature of the surface being heated. Ceramic band heaters use infrared radiation and can operate 300 to 500 °C above the heated surface. They therefore generally require integrated insulation to maintain a comparable outer shroud temperature and limit heat loss.
- Watt density: mica band heaters can typically achieve equal or higher watt density than ceramic band heaters for operating temperatures commonly required in the plastics industry.
- Customization: mica bands are highly customizable. Holes and slots can be added with few constraints, and the heater can be produced as a circular band, flat plate or conical band. Circular mica bands can be produced down to 1.00 in. in diameter. Ceramic bands are limited by fixed-size ceramic components, cannot be conical and may be problematic below 2.50 in. in diameter.
- Thickness: mica bands are thin, typically between 0.12 and 0.19 in. thick. Ceramic bands are usually between 0.40 and 0.75 in. thick.
- Cost and weight: mica bands are cheaper and lighter than ceramic bands.
What are the advantages of ceramic band heaters?
- Installation: because ceramic bands transfer heat by infrared radiation, direct contact with the heated surface is less critical and less installation tension is required. Mica bands must sit tightly against smooth, clean surfaces. Poor seating reduces heat transfer and can cause overheating. Ceramic bands are therefore generally easier to install reliably.
- Operating temperature: when properly de-rated, ceramic band heaters can achieve higher operating temperatures.
- Repairability: ceramic bands can be repaired by replacing the ceramic assembly and reusing undamaged components. At Volton, a repair costs 30% less than a new band while offering the same lifespan. Ceramic bands can also be repaired multiple times.
Explore our mica and ceramic band heaters
Explore Volton's mica band heaters and ceramic band heaters to find the configuration suited to your application.
