How to Stop Your Glass From Shattering During Rapid Tempering
If you’ve ever worked with glassware, you know the nightmare. You’re moving from heat to cold, and crack—there goes your piece. It usually happens right in that transition window. To get around this, we use high-output quartz infrared lamps for “flash tempering.” They get the glass to the right temperature in seconds, but the real secret isn’t just cranking up the heat. It’s about how you control it. The trick is the timing. Quartz lamps don’t hold onto heat like old-school resistive elements do. Those bulky heaters stay hot long after you flip the switch, which is a problem when you need precision. Quartz, on the other hand, reacts almost instantly. If you pair these lamps with an SCR or a fast-switching PLC, you can dial the wattage up or down in milliseconds. It lets you build a gentle temperature gradient. Instead of the outside of the glass expanding way faster than the core—which is basically a recipe for a disaster—you get a smooth, controlled heat-up. Why quartz? We go with high-purity fused quartz because it can take a beating from extreme heat without breaking down. Plus, these lamps put out short-wave infrared radiation. Instead of just scorching the surface, this heat actually sinks deep into the glass. When the core and the surface heat up together, you don’t get those nasty internal stresses that cause the glass to explode mid-cycle. A few things to watch out for. These tubes pack a massive punch, but they’re delicate. First off,**never touch the quartz with your bare hands.**The oils from your skin create tiny hot spots on the glass, and that’s how you end up with a burnt-out lamp way sooner than you should. And a heads-up on your gear: while fast power adjustments save your glass, they’re tough on your electronics. Make sure your controllers can handle the high inrush current. If they aren’t spec’d right, you’ll be spending more time replacing blown fuses than actually making glass.