The Headache of Long-Haul Infrared Heating for Glass Kilns
Most infrared lamps stop at 1.5 or 2 meters. That’s fine for a small setup, but if you’re running a glass tunnel kiln that needs a continuous heat zone longer than that? Standard off-the-shelf tubes just won’t work. That’s where we come in. We build custom, ultra-long quartz tube units that actually fit your linear layout without the gaps. The battle with voltage drop Here’s the thing: when you stretch a heating element past 2 meters, physics starts working against you. Voltage drop becomes a nightmare. If you just wire them in a simple series, you’ll end up with cold spots that ruin your glass. To fix this, we get picky about the tungsten filament and the quartz wall thickness. The goal is to keep the wattage per centimeter exactly the same from one end to the other. You’ll also want to make sure your transformer output is tuned to these specific lengths. If it’s off, you’ll likely burn out the ends of your tubes. Fighting the sag We use high-purity fused quartz because it can handle the heat, but long tubes have a habit of bowing or sagging under their own weight once they get hot. It’s a real pain. If your supports are too far apart, the tube warps. Once it warps, your focal point shifts, and suddenly your heating is uneven. We solve this by calculating very specific mounting intervals to keep everything straight and true. The reality of installation Having a continuous layout is great for the glass, but it creates a massive heat footprint. We make these “drop-in” replacements to save you time, but you have to be careful. Handling a quartz tube over 2 meters is nerve-wracking. One wrong move—one little bump against the kiln frame—and snap. It’s gone. Make sure your team has a wide-open path for installation. Plus, these long tubes pull a lot of current. Check your wiring gauge. If it’s too thin, your conduits will overheat, and that’s a problem you really don’t want on your hands.