Keeping it Clean: The Truth About IR Heating in Class 100 Rooms
If you’re running a Class 100 cleanroom, you already know the nightmare of particles. One tiny flake of dust and your whole batch is toast. The problem is that most heating elements are basically dust factories—they oxidize, they peel, and they shed bits of themselves right into your airflow. We figured out a way to stop that. The secret is a mix of high-purity quartz and gold. Why we use gold Most people use aluminum reflectors. They’re cheap, but they have a flaw: they oxidize. Over time, that creates a microscopic layer of dust. Not great when you’re trying to keep things sterile. We go with a vacuum-deposited gold layer instead. Gold doesn’t oxidize. Period. It also bounces about 98% of short-wave infrared radiation straight onto your workpiece. Instead of the heat soaking into your machine frame and warming up the whole room, it goes exactly where it needs to. It’s a much tighter, cleaner thermal footprint. The grit on the materials Under the gold, we use a high-purity quartz tube. We’re picky about the purity because impurities cause “hot spots,” which is just a fancy way of saying the lamp burns out too early. Quartz is great because it doesn’t freak out when you cycle the heat up and down rapidly. And since the gold is chemically bonded to the reflector, it won’t peel or flake off. It’s the only way I’ve found to actually hit zero-particle emissions during a long production run. A few things to watch out for Here’s the catch: these lamps are incredibly intense. Because the gold reflector is so efficient, your housing has to be spot on. If the lamp shifts even a couple of millimeters, you’ll miss your focal point. Make sure your mounting brackets are rock solid. We mostly build these for the semiconductor and medical device crowds. If you’re switching over from standard IR lamps, take a look at your power supply. You might actually be able to drop your wattage and still hit the same surface temperature. Plus, your cooling system will thank you since you aren’t fighting as much waste heat.