Cartridge heaters are available with a standard 304 Stainless Steel sheath. In addition, 316SS and Incoloy 800 are optional. 304SS is excellent for most applications. However for extremely high temperature applications, Incoloy 800 is the better choice. For some corrosive environments, 316SS is recommended. The chart below can help in selecting a sheath material.

Fluid being heated 304SS 316SSMax Watt Density Max Temp (°F)
Air up to 1200 °F E E E 1200
Air up to 1400°FGGE 1400
Air up to 1600°F FFG1600
Acetic Acid FGF180
Acetone EEE130
Asphalt EEE200-500
Caustic Soda, 10%EEE210
Degreasing Solution GEE275
Electroplating Bath, Cadmium EEE180
Electroplating Bath, Copper EEE180
Ethylene Glycol EEFNA
Freon EEE300
Glycerin EEE500
Kerosene EEENA
Molasses EEE100
Nitric Acid (30% max) FFNR167
Oil (SAE 30)EEE250
Oil (SAE 50) EEE250
Oil, Vegetable or Mineral EEE400
Paraffin or Wax EEENA
Trichlorethylene FFF150
Water, DistilledEEE212
Water, TapFEE212