Dealing with Cold Spots in Glass Annealing
Ever had a piece of glassware with a weird shape—maybe a tight curve or a narrow neck—and it just… pops? It’s frustrating. The problem is that standard kilns usually rely on hot air. But air is lazy. It doesn’t like to go into those tight spots, creating “dead zones” where the glass stays too cold. When one part of your piece cools faster than the rest, you get internal stress. And we all know where that leads: a shattered product and a lot of wasted time.
Why IR Actually Works
We stopped fighting the air and started using short-wave infrared quartz lamps. Here is the thing: IR radiation doesn’t drift around like a breeze. It moves in a straight line and hits the glass surface directly. By angling these lamps from a few different directions, you can basically “beam” the heat right into those deep recesses. It kills the cold spots and keeps the whole piece stable.
The Nitty-Gritty (and the Gotchas)
Getting the heat right comes down to your wattage and voltage. If you want to ramp up the temperature fast, you need high-wattage quartz tubes. We use fused quartz envelopes because they can take the heat without warping or sagging. But a word of caution: these lamps are hungry. They pull a lot of current. If you just plug in a bunch of them without checking your cable gauges or upgrading your contactors, you’re asking for a burnout.Check your wiring first.
Getting it on the Floor
The good news is that these are designed to be drop-in replacements for your old heating elements. We kept the connectors standard so you can get them installed and get back to work quickly. Just remember that quartz is fragile. It can handle a thousand degrees, but it can’t handle a bump. Make sure your brackets are rock solid and that your glassware never actually touches the tubes during a cycle. If a tube snaps, that whole heating zone is dead until you swap it out. It’s a small price to pay for the quality, but you’ve got to be careful with them.