Graphite Immersion Heater Tube
Protective graphite sheath tube for immersion heaters in molten metal baths. High free carbon content provides corrosion resistance in aggressive environments. Fired ceramic refractory tube per HTS 6903.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If complete immersion heater assembly
Electrical heaters with protective tubes classified by function in Chapter 85.
If silica brick construction
Alternative refractory materials change to different Chapter 69 headings.
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Import Tips & Compliance
• Emphasize protective refractory function vs electrical component classification
• Include temperature rating specs (≥1000°C) to prove refractory purpose
• Heater assemblies may shift to Chapter 85 if electrical elements included
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