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| Type | Insulation | Max. Temperature | Volts |
| WS | Silicone | 390°F (200°C) | 600V |
| WF | Fiberglass | 480°F (250°C) | 600V |
| WM | Mica/Glass | 840°F (450°C) | 600V |
| Heated Medium | Process Temperature °F (°C) |
Sheath Material | Max. Watt Density W/in2 (W/cm2) |
| SOLIDS | |||
| Clamp on to Metal | To 500 (260) To 1000 (540) |
Incoloy® | 20 (3) 10 (1.5) |
| Milled Groove Molds | To 500 (260) To 1000 (540) |
Incoloy® | 60 (9) 30 (4.5) |
| Vacuum Platens | To 650 (345) To 1000 (540) |
Aluminum, SS Incoloy® or Inconel® |
40 (6) 20 (3) |
| LIQUIDS | |||
| Clean Potable Water | To 212 (100) To 500 (260) |
Copper Incoloy® |
60 – 90 (9 – 14) 30 – 40 (4.5 – 6) |
| De-I Water | To 212 (100) | 316SS | 60 (9) |
| Process Water & Very Diluted Corrosives |
To 200 (95) | 304SS or Incoloy® | 48 (7.5) |
| Mild or Diluted Acids & Alkalies |
To 200 (95) | Incoloy®, 316SS or Inconel® |
15–23 (2.3 – 3.5) |
| Oils (Depends on Type & Use) | 50 – 600 (10-315) | Steel | 6 – 23 (1 – 3.5) |
| AIR | |||
| Ovens, Natural Convection | To 700 (370) To 1200 (650) |
Incoloy® | 30 (4.5) 10 (2.3) |
| Flowing Air @ Min. 500 fpm |
To 800 (425) To 1000 (650) |
Incoloy® | 30 (4.5) 23 (3.5) |
| Sheath Material | Maximum Temperature in Air °F (°C) | Typical Aplications |
| Standard Available Sheath Materials | ||
| Copper | 350 (175) | Clean, potable water heating |
| Aluminum | 750 (400) | Vacuum platens |
| Steel | 750 (400) | Oils, glycol, molten salts, non-corrosives |
| SS304 | 1200 (650) | Improved corrosion resistance over steel |
| SS316 | 1200 (650) | De-ionized water and some corrosives |
| Incoloy® 840 | 1600 (870) | Improved corrosion resistance over steel and 304SS |
| Incoloy® 800 | 1600 (870) | Improved resistance to chloride attack, other corrosives |
|
Other Available Sheath Materials |
||
| SS321 | 1200 (650) | Improved corrosion resistance over steel and 304SS |
| Incoloy® 825 | 1600 (870) | Highly resistant to many acids, salts, and other media |
| Inconel® 600 | 1800 (980) | Highly resistant to many acids, salts, and other media |
Bharatbhai Patel (Patel Electric Corporation)
K-901/5/6, GIDC, Makarpura, Vadodara, Gujarat - 390010, India
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