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Type W Molybdenum Disilicide Heating Elements
Step 1
Indicate which type of element you need.
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Type 1700 "W"
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Type 1800 "W"
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Step 2
Indicate the following dimensions identified in the element drawings above:
- Heated Length Diameter (d)
- Terminal Diameter (c)
- Heated Length (Le)
- Terminal Length (Lu)
- Terminal Spacing (a)
Note: Element diameters are normally specified in millimeters. For example, an element with a (d) diameter of 6 mm and a (c) diameter of 12 mm is often referred to as a 6/12 element. Other dimensions may be specified in millimeters or inches.
AVAILABILITY
TYPICAL SIZES
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Grade
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1700
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1800
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1900
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d/cmm
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3/6
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4/9
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6/12
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9/18
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12/24
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3/6
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4/9
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6/12
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9/18
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12/24
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3/6
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6/12
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Le, max mm
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350
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450
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1400
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1400
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1700
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350
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450
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1400
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1400
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1700
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320.0
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360.0
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Lu, max mm
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300
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450
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1000
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1000
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1000
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300
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450
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1000
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1000
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1000
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320.0
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360.0
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a typical mm
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25
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25
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40/50
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60
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80
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25
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25
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40/50
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60
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80
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25
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40/50
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f mm
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25
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25
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45
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75
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100
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25
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25
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45
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75
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100
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25
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45
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g mm
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15
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15
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25
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30
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40
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15
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15
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25
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30
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40
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15
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25
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USEFUL ELEMENT TEMPERATURES IN VARIOUS ATMOSPHERES, ºC (ºF)
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Grade
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1700
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1800
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1900
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Air
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1700 (3092)
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1800 (3272)
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1850(3360)
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Nitrogen
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1600 (2912)
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1700 (3092)
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1800 (3270)
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Argon, Helium
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1600 (2912)
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1700 (3092)
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1800 (3270)
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Hydrogen
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1100-1450
(2012-2642)
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1100-1450
(2012-2642)
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1100-1450
(2012-2642)
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Nitrogen/Hydrogen 95/5%*
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1250-1600
(2282-2912)
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1250-1600
(2282-2912)
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1250-1600
(2282-2912)
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Exogas
(e.g. 10% CO², 5% CO, 15% H²)
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1600 (2912)
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1700 (3092)
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1700 (3092)
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Endogas
(e.g. 40% H², 20% CO)
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1400 (2552)
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1450 (2642)
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1450 (2642)
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Cracked and partially burnt ammonia (~8%H² )
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1400 (2552)
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1450 (2642)
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1400 (2552)
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Step 3
Indicate any other critical dimensions or tolerances if needed.
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