http://ruby-ir-heater.com/en/tags/cracks/ Recent content in Cracks on Ruby Infrared Heating Solutions Hugo en-us Fri, 24 Jul 2026 10:15:26 +0800 http://ruby-ir-heater.com/en/posts/preventing-thermal-shock-and-fracture-in-glass-annealing-processes/ Fri, 24 Jul 2026 10:15:26 +0800 http://ruby-ir-heater.com/en/posts/preventing-thermal-shock-and-fracture-in-glass-annealing-processes/ <p><img src="http://ruby-ir-heater.com/images/188f9035a5ed66fdec335fe67762e522.png" alt="Why glass cracks in annealing"></p> <h1 id="why-your-glass-keeps-cracking-during-annealing">Why Your Glass Keeps Cracking During Annealing</h1> <p>Ever had a <a href="https://henruite.com">piece</a> of glass shatter right when you thought it was safe? It’s gut-wrenching. Usually, it comes down to a simple fight happening inside the glass. When the outside cools down way faster than the core, the glass starts pulling against itself. It&rsquo;s like a tug-of-war where the glass is the rope. Eventually, something has to give.<strong>Snap.</strong></p> <h2 id="the-struggle-with-thermal-stress">The struggle with thermal stress</h2> <p>The trick is getting the glass to that &ldquo;sweet spot&rdquo;—the annealing point—where it&rsquo;s soft enough to let go of all that internal tension. From there, you have to baby it as it cools. If you rush the process or drop the temp too fast, you basically freeze those stresses in place. The piece looks fine on the outside, but it&rsquo;s a ticking time bomb. One tiny scratch or a slight breeze, and the whole thing blows up.</p>