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Starbar® & Moly-D® Heating Elements > Starbar Silicon Carbide SiC Heating Elements > Type DB Dumbbell and TDB Tubular Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Elements > View Items  
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Type DB Dumbbell and TDB Tubular Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Elements

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One of the earliest heating element designs, the enlarged cold ends of the Dumbbell style element were originally made oversized to increase cold end cross section, lowering electrical resistance, thereby lowering cold end operating temperature. Modern Dumbbell Starbars, by contrast, employ an advanced technology to keep the terminal ends cool by virtue of the decreased resistivity of the lower resistance cold end material used in the manufacturing process. Oversize cold ends are therefore no longer necessary. Non-dumbbell (RR Starbars) can be substituted for Dumbbell Starbars. Improvements in the cold-end-to-hot-zone resistance ratio between the original DB and new DB Starbar have been dramatic. The old style resistance ratio was 1:3, whereas the new DB and RR resistance ratio is a minimum of 1:15.

The first several inches of the cold ends are metalized with aluminum to provide a low-resistance contact surface. Electrical connections are made using flat aluminum braids, held in compression to the cold end circumference by stainless steel spring clamps.

DB Starbars are described by giving the overall length, the heating section length, the hot zone outer diameter and the cold end outer diameter.

As an example, DB 22 x 15 x .31/.50 is a Dumbbell Starbar 22 inches long, 15 inch hot zone, .31 hot zone OD and .50 cold end OD. In millimeters the part number would be DB 560 x 380 x 8/14.

For sizes available, please refer to Table B, DB Starbar Dimensions.

With a larger diameter, thinner wall, and clear inner diameter (ID) the TDB are used as tube heaters. An electrically insulative load tube, usually made of mullite, can be used to isolate the product from the TDB Starbar. The surface of Starbars are electrically live. See Table B, for the ID dimensions and recommended load tube diameters.




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  Results 1 - 9 of 9 1 

Item #

Item Name

Hot Zone Outer Diameter

Cold End Outer Diameter

Maximum Heating Length

Maximum Overall Length

DB-0.31-8 Type DB Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 0.31 Inch
8
mm
0.56 Inch
14
mm
12 Inch
305
mm
22 Inch
559
mm
DB-0.44-12 Type DB Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 0.44 Inch
12
mm
0.75 Inch
18
mm
24 Inch
610
mm
31 Inch
787
mm
DB-0.56-14 Type DB Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 0.56 Inch
14
mm
0.88 Inch
22
mm
24 Inch
610
mm
51 Inch
1295
mm
DB-0.75-18 Type DB Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 0.75 Inch
18
mm
1.10 Inch
28
mm
32 Inch
813
mm
59 Inch
1498
mm
DB-1.00-25 Type DB Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 1.00 Inch
25
mm
1.50 Inch
38
mm
36 Inch
914
mm
71 Inch
1803
mm
DB-1.18-30 Type DB Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 1.18 Inch
30
mm
1.75 Inch
45
mm
48 Inch
1219
mm
90 Inch
2286
mm
TDB-1.12-30 Type TDB Tubular Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 1.12 Inch
30
mm
1.50 Inch
38
mm
24 Inch
610
mm
40 Inch
1016
mm
TDB-1.63-40 Type TDB Tubular Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 1.63 Inch
40
mm
2.00 Inch
50
mm
24 Inch
610
mm
40 Inch
1016
mm
TDB-2.00-50 Type TDB Tubular Dumbbell - (Enlarged Cold End) - Silicon Carbide Heating Element 2.00 Inch
50
mm
2.38 Inch
60
mm
24 Inch
610
mm
40 Inch
1016
mm
  Results 1 - 9 of 9 1 
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