A cartridge heater is a tube-shaped, heavy-duty, industrial joule heating element (electrical resistance) used in the process heating industry, usually custom manufactured to a specific watt density, based on its intended application. Highly compacted they reach a surface watt density of up to 50 W/cm².
It may be used to heat any kind of substance or material, such as oil, air, or sugar. However, a common application are plastic pellets, which are melted in order to form molded plastic parts. An example of such a process is the “hot runner” process. Cartridge heaters resemble tubular heaters structurally but tend to have higher watt densities.
Material | Maximum Operating Temperatures | Maximum Watt Densities | ||
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°F | °C | W/in2 | W/cm2 | |
Alloy 600 | 1400 | 760 | 400 | 62 |
Features | Benefits |
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Nickel chromium resistance wire |
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Magnesium oxide insulation of specific grain and purity |
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Alloy 800 sheath |
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Minimal spacing between element wire and sheath |
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Conductor pins |
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UL® and CSA approved flexible stranded wires |
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Patented lead adapter (LA) method |
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International Organization for Standardization (ISO) 9001 certified |
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