Glass bead annealing heater

Sun, 12 Jul 2026 06:49:29 +0800

Stopping Glass Beads From Cracking: A Guide to Thermal Shock

If you’ve ever worked with glass beads, you know the nightmare of thermal shock. You hit cold glass with a sudden blast of heat, and snap—the material fractures. It’s frustrating, wasteful, and usually happens because the temperature change was just too aggressive. We handle this by using shortwave infrared (IR) lamps that can change their power output on a dime.

Why the Hardware Matters

You can’t just use any old heating element here. Slow heaters are too clunky. We stick with quartz halogen lamps because they have very low thermal mass. In plain English? They heat up and cool down almost instantly. When you pair these lamps with an SCR or a fast-switching PWM controller, you get total control over the wattage in real-time. Instead of slamming the glass with a heat spike, you create a “soft start.” It’s a gradual ramp-up. This gives the core of the bead and the outer surface time to catch up with each other, so the glass doesn’t freak out and crack.

Bead on Warm IR Heat Wave Systems

Glass bead annealing heater

Stopping Glass Beads From Cracking: A Guide to Thermal Shock

Why the Hardware Matters