Keeping Things Clean in Vacuum Heating
If you’re heating a workpiece in a Class 100 cleanroom or a high-vacuum chamber, you already know the nightmare: one single speck of dust or a tiny bit of outgassing, and your whole batch is trash. Standard IR lamps just aren’t built for this. Most of them rely on cheap adhesives or low-grade glass that starts “bleeding” gases the second they get hot. That’s a recipe for ruined wafers and a lot of wasted time.
Why the Material Actually Matters
We stick with high-purity fused silica for our tubes. It’s a different beast than standard quartz. Because the impurity levels are so low, the lamp doesn’t shed those microscopic particles as it expands and contracts with the heat. We also stripped out every single organic binder and glue from the assembly. Everything gets a thorough bake-out before it reaches you. That way, you don’t have to worry about volatile organic compounds (VOCs) leaking into your vacuum and messing up your environment.
The Reality of Vacuum Design
Here’s the thing: lamps in a vacuum act differently than they do in open air. Since there’s no air to carry the heat away, the lamp envelope getshot. Really hot. You’ll need to make sure your cooling system can actually keep up. If you try to push a high-wattage tube without a solid heat sink for the terminals, you’re likely to burn out the seals. We spend a lot of time obsessing over the seal between the tungsten filament and the quartz. In a vacuum setup, a tiny pinhole leak isn’t just a broken lamp—it’s a contamination event for your entire chamber.
Setting It Up Without the Headaches
When you’re wiring these in, put away the plastic zip-ties and PVC-coated wires. They’ll melt and off-gas almost immediately. Stick with PTFE or stainless steel cladding instead. The best part? These lamps use direct radiative heat. You’re heating the part itself, not the air around it. In a cleanroom, that’s a huge win because it cuts down on the turbulence that usually kicks up floor dust. You get the thermal control you need, and your ISO class stays exactly where it should be.