http://ir-heating-stuff.com/en/tags/tempering/ Recent content in Tempering on IR Heating Equipment Hub Hugo en-us Mon, 20 Jul 2026 12:21:54 +0800 http://ir-heating-stuff.com/en/posts/glass-tempering-preheating-lamp/ Mon, 20 Jul 2026 12:21:54 +0800 http://ir-heating-stuff.com/en/posts/glass-tempering-preheating-lamp/ <p><img src="http://ir-heating-stuff.com/images/c2c284b428310e9163b952112a56dc15.png" alt="Glass tempering preheating lamp"></p> <h1 id="why-your-ir-lamps-are-probably-ruining-your-glass">Why Your IR Lamps are Probably Ruining Your Glass</h1> <p>If you&rsquo;ve spent any time in a glass tempering shop, you know the frustration of &ldquo;drift.&rdquo; It’s a nightmare. You nail one rack perfectly, but the next one comes out bowing or stressed for no apparent reason. You start questioning everything. But here is the secret: usually, it isn&rsquo;t the oven acting up. It&rsquo;s the lamps.</p> <h2 id="the-problem-with-close-enough">The problem with &ldquo;close enough&rdquo;</h2> <p>When you&rsquo;re using shortwave infrared preheating, tiny differences matter. If your lamps have even a 5% variance in wattage or spectral output, you&rsquo;re basically baking the glass unevenly. You get cold spots, which lead to uneven thermal expansion. That&rsquo;s why we obsess over the small stuff—things like how the filament is wound and the purity of the quartz. When you wire up a bank of 20 lamps, you don&rsquo;t want 20 individual heaters fighting each other. You want them to behave like one single, massive, uniform heat source. That&rsquo;s the only way to get a consistent result.</p>