Star performers in float glass production, TYPE W THREE PHASE Starbars® are comprised of high purity, high density, silicon carbide grains, self bonded through recrystallization at elevated temperatures. Sintering at temperatures in excess of 2200ºC provides a structural density of 2.52 grams per cubic centimeter. Such high structural density results in Starbars® of maximum strength and minimum porosity, with an extremely slow aging characteristic.

Strength of the Starbars® is further enhanced by insertion of hot zones into oversized cold ends. Enlarged cold ends measure 28 mm (1.10") in diameter, accommodating hot zones of 19 mm (0.75") in diameter.

Close tolerance sizing helps assure Starbar® fit to conventional roof construction. Leg to leg on center spacing is 52 mm (2.05"). Overall element length is 647 mm (25.47"). Length of hot zone is 265 mm (10.43"). Height of bridge is 32 mm (1.26"). Cold end length is 350 mm (13.78"). The support 5.6 mm (0.22") hole is 44 mm (1.73") from the top of the cold end.



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Leg to Leg Oncenter Spacing

2.05 Inch
52 mm

Overall Element Spacing

25.47 Inch
647 mm

Maximum hot zone length

10.43 Inch
265 mm

Height of Bridge

1.26 Inch
32 mm

maximum cold end length

13.78 Inch
350 mm

Electrical Connections

Electrical connections are made at the three aluminum sprayed ends, with cold ends kept cold through oversizing, and use of a special, low resistance end material. Cold end hardware for each element includes: (3) 75 amp, bolt-type, aluminum strap connectors, (2) stainless steel support pins (cotter pins) and (3) ceramic step washers.

Washers available for support and sealing include: flat ceramic washers, ceramic steps washers, stainless steel flat washers, and compliant fiber washers.

Manufactured to Working speficiations

To meet stringent float glass performance requirements, all TYPE W THREE PHASE Starbars® are calibrated at least twice at 69 volts, at a surface temperature of 1070ºC. With a nominal resistance of 0.85 ohms (+/- 20% manufacturing tolerance), individual shipments are matched, within tight tolerances, to your stated specifications. Calibrated amperage is clearly marked on the Starbars®; on individual Starbar® cartons; and on the 920 mm (36″), cubed, wooden crates, containing 50 carefully packed elements. Hot zone to cold end resistance ratio is guaranteed minimum 17 to 1, with Starbars® designed to operate comfortably at a loading of 3.75 kW.

constructed for long life

Cooler Operating Cold Ends: The cold ends of TYPE W THREE PHASE STARBARS are comprised of a special low resistance end material. Featuring a negative resistance/temperature curve, as the cold ends are exposed to heat, resistance to current passage lessens, resulting in significantly cooler operation.

Slower Aging Hot Zones: With a structural density of 2.52 gram/cc, TYPE W THREE PHASE STARBARS feature the extremely slow aging characteristic most desired in float glass production. High density helps prevent the hot zone’s internal lattice structure from being oxidized, while considerably enhancing the Starbar’s® strength.

Unique Split Bridge Construction: Our Starbar® bridge is manufactured in two distinct halves, split longitudinally across the element’s width. When the element is assembled, the ends of element hot sections (together with both halves of the split bridge) are held together with epoxy. Then the bridge is fired in a silicon atmosphere. This converts the free carbon in the epoxy to silicon carbide, essentially making a silicon carbide weld. The bridge is very strong, low in resistance, and high in density.

packaged for flawless performance

All Type W Three Phase Starbars are wrapped in soft foam rubber and individually placed inside corrugated cardboard containers. Fifty element cartons are then packed, bridges down, into a wooden shipping container, with additional soft packing added.

Type W Packaging