Keeping Your IR Lamp Filaments from Sagging
If you’re running an infrared lamp on a cycle, you know it’s not just about the heat. The filament is constantly breathing—expanding when it’s on and shrinking when it’s off. Do that tens of thousands of times, and those supports start to feel the strain. That’s where fatigue kicks in. If you aren’t careful, that tungsten wire starts to give way, and suddenly you’ve got a problem.
The headache of “creep”
Here’s the thing: when the lamp hits peak temperature, the metal gets soft. If the support brackets aren’t up to the task, the filament starts to “creep.” It’s a slow sag. But once it happens, the wire can drift, touch the quartz envelope, or just shift the heat away from where you actually need it. We use specific high-grade alloys for the supports because they hold their grip even when things get scorching.
No guessing games
We don’t just hope the lamps last. We beat them up in the lab. We run them through rapid on-off cycles to mimic years of actual shop-floor abuse. We’re looking for movement. If that wire shifts even a fraction of a millimeter after 20,000 cycles? We scrap the design and start over.
The trade-off (Read this part)
There is a catch. To stop that sagging, we have to keep the tension tight. That means the electrodes are under a lot of pressure.**Please, be gentle with these tubes.**If you drop one or jam it into place too hard during installation, it might snap. The system is tuned for high tension, so it doesn’t take much of a clumsy move to break it.
Why you should actually care
A saggy filament ruins your heat distribution. Whether you’re curing fabric or blowing PET, a tiny 2mm dip can create a cold spot on your product. That’s how you end up with rejected parts. By using supports that can actually handle the fatigue, you get a consistent heat footprint. Plus, you don’t have to spend your weekend swapping out tubes every few months.