The Real Deal on Ultra-Long Quartz Infrared Tubes for Tunnel Kilns
If you’re running a tunnel kiln and need heat across a span of 2 meters or more, you quickly realize that standard, off-the-shelf lamps just don’t work. You end up with these annoying cold spots where the lamps overlap, and in a high-precision setup, that’s a nightmare. That’s why we build these custom long-form units. We want one continuous stretch of heat, no gaps, no guesswork. The battle with voltage and heat Here is the thing: when you go long—we’re talking 2000mm plus—you start fighting voltage drops. If you aren’t careful, the ends of the tube stay lukewarm while the center gets way too hot and burns out. To stop that from happening, we spend a lot of time tweaking the tungsten filament geometry. We balance the wattage so the heat stays steady from one end to the other. Just a heads-up: make sure your power supply can handle the total load. You don’t want to be the person tripping the breakers every time you flip the switch. Why clear quartz? (And why it’s scary) We use high-purity clear quartz because it lets short-wave radiation fly straight through. It doesn’t soak up the heat; it pushes it right into your product. But there’s a catch. These tubes are long, and quartz is… well, quartz. If they aren’t supported perfectly, they’ll bow or just snap under their own weight. Please, don’t pin them too tightly. We use precision-machined clips that give the tube room to breathe as it expands. If you lock it down too hard, it’ll crack the second it hits operating temp. It’s a heartbreaking sound. The trade-off These units are great for dropping into large industrial tunnels. They stop that “striping” effect on your product, which makes everything look a lot cleaner. But let’s be honest: a 2-meter glass tube is a liability. One clumsy bump against the kiln frame during installation and it’s game over. To make life easier, we suggest a staggered wiring layout. It keeps the workspace tidy and means you can swap out a single unit without having to tear apart your entire production line. It just makes the whole process feel less like a gamble.