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Type TW Silicon Carbide Heating Elements

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The Starbar TW element is a higher density element, used in severe applications such as corrosive atmospheres or where normal RR type elements do not provide acceptable service life. The TW element has a typical density 10 to 12% higher than normal RR elements. This higher density results in slower oxidation and aging, which yields longer element life. The dimensions and electrical properties of the TW element are similar to those of the RR element, therefore, a TW element may be interchanged directly for an RR element. The TW element due to its higher density may be more prone to thermal shock during installation into hot furnaces. Special care should be used not to thermal shock new elements during installation and heat up.

TW Starbars are described by giving the overall length, the heating section length, and the diameter. As an example, TW 43 x 24 x 1 is a Starbar 43" overall with a 24" hot zone, and 1" in diameter.




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Item #

Diameter

Hot Zone (Electrical Resistance)

Cold End (Electrical Resistance)

TW-5/8-16 5/8 Inch
16
mm
0.1262 Ohms/Inch
0.00497
Ohms/mm
0.00631 Ohms/Inch
0.000248
Ohms/mm
TW-3/4-19 3/4 Inch
19
mm
0.0865 Ohms/Inch
0.00341
Ohms/mm
0.00433 Ohms/Inch
0.00017
Ohms/mm
TW-1-25 1/1 Inch
25
mm
0.05 Ohms/Inch
0.00197
Ohms/mm
0.0025 Ohms/Inch
0.000098
Ohms/mm
TW-1-1/4-32 1-1/4 Inch
32
mm
0.0343 Ohms/Inch
0.00134
Ohms/mm
0.00171 Ohms/Inch
0.000067
Ohms/mm
TW-1-1/2-38 1-1/2 Inch
38
mm
0.0234 Ohms/Inch
0.00092
Ohms/mm
0.00117 Ohms/Inch
0.000046
Ohms/mm
TW-1-3/4-44 1-3/4 Inch
44
mm
0.0165 Ohms/Inch
0.00065
Ohms/mm
0.00082 Ohms/Inch
0.000032
Ohms/mm
TW-2-1/8-54 2-1/8 Inch
54
mm
0.015 Ohms/Inch
0.00059
Ohms/mm
0.00075 Ohms/Inch
0.00003
Ohms/mm
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