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 2.50 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.
Leg to Leg Oncenter Spacing
Overall Element Spacing
Maximum hot zone length
Height of Bridge
maximum cold end length
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
constructed for long life
Cooler Operating Cold Ends: The cold ends of TYPE W THREE PHASE STARBARS are 9 mm (0.35″) larger in diameter than the hot zones, and 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 2.5 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: Over a considerable period of time, our field and laboratory testing has identified the bridge as the weakest point of design in the three phase element’s structure. To enhance bridge strength, we have employed a 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