Sheath Materials
Backer Marathon HotRod cartridge heaters are available with a standard 304SS sheath. In addition, 316 stainless steel and Incoloy 800 are optional. 304SS is excellent for most applications. However for extremely high temperature applications, Incoloy 800 is the better choice and for some corrosive environments 316SS is recommended. The chart below can help in selecting a sheath material.
E=Excellent, G=Good, F=Fair, NR=Not Recommended
| Fluid being heated | 304SS | 316SS | Incoloy | Max Watt Density | Max Temp (°F) |
|---|---|---|---|---|---|
| Air to 1200 °F | E | E | E | ||
| Air to 1400°F | G | G | E | ||
| Air to 1600°F | F | F | G | ||
| Acetic Acid | F | G | F | 40 | 180 |
| Acetone | E | E | E | 20 | 130 |
| Alcohol | F | E | E | 25 | 212 |
| Asphalt | E | E | E | 4-10 | 200-500 |
| Caustic Soda, 10% | E | E | E | 100 | 210 |
| Degreasing Solution | G | E | E | 40 | 275 |
| Electroplating Bath, Cadmium | E | E | E | 100 | 180 |
| Electroplating Bath, Copper | E | E | E | 100 | 180 |
| Ethylene Glycol | F | F | F | 30 | |
| Freon | E | E | E | 2-5 | 300 |
| Glycerin | E | E | E | 10 | 500 |
| Kerosene | E | E | E | 25-30 | |
| Molasses | E | E | E | 5 | 100 |
| Nitric Acid (30% max) | F | F | NR | 20 | 167 |
| Oil (SAE 30) | E | E | E | 20 | 250 |
| Oil (SAE 50) | E | E | E | 10-15 | 250 |
| Oil, Vegetable or Mineral | E | E | E | 30 | 400 |
| Paraffin or Wax | E | E | E | 16 | |
| Steam @ 300°F | E | E | E | 30 | 300 |
| Steam @ 500°F | E | E | E | 25 | 500 |
| Trichlorethylene | F | F | F | 30 | 150 |
| Water, Distilled | E | E | E | 300 | 212 |
| Water, Tap | F | E | E | 300 | 212 |
E=Excellent, G=Good, F=Fair, NR=Not Recommended
