Dealing with Heat: Why Your Fab Lamps Need Quartz Shields
If you’re running a smart Fab setup, you know that getting your IR sources to behave is half the battle. To keep those high-density lamps from messing with the rest of your production line, we use quartz glass shields. Think of them as more than just a cover. They’re really there to manage the “handshake” between the heating element and whatever you’re actually working on. Why quartz? Because regular glass would just explode. When you fire up a high-wattage lamp, the temperature jump between the filament and the air is brutal. Standard glass can’t take that kind of shock; it just shatters. Quartz is different. It stays cool under pressure and lets that shortwave IR radiation slide right through without soaking it up. That way, the heat actually hits your target instead of getting trapped in the shield. Getting the fit just right In a digital setup, your temperature tolerances are tight. There’s no room for “close enough.” We focus heavily on the air gap. If the shield is too close to the lamp, you’ll likely burn the lamp out through conduction. But if it’s too far? You lose that concentrated heat footprint you worked so hard to calibrate. And a quick tip: check your vacuum or atmospheric pressure before picking your thickness. If you get the spec wrong, the shield will warp over time, and then you’re back to square one. The trade-off Here’s the catch. Quartz is great for keeping contaminants off your lamps—which is huge, because any gunk on the surface creates hot spots that kill the filament. But quartz is also brittle. One clumsy move during a tool change or a bit of unexpected vibration in the line, and snap. It’s gone. Because of that, you’ve got to be realistic about your maintenance. We always suggest using a rigid mounting frame. It keeps everything locked in place so the shield doesn’t shift as things heat up and expand. When you get the shielding right, your IR system finally plays nice with your controllers. You get a stable thermal baseline, and your automated processes actually run the way they’re supposed to.