The main causes for damage are impacts and extreme temperatures. Impacts From CookwareGlass-ceramic stove tops are durable, but not immune to the impact of heavy objects. Dropping or banging a heavy object on the surface will likely cause damage.When dragged across the glass surface, rough pots and pans create micro-scratches. As they accumulate over time, they can weaken the integrity of the glass to the point of cracking.Excessive Heat and Temperature ChangesCertain cookware sustains heat longer. This extended heat exposure can create enough stress to crack the glass.Food that has been cooked onto the surface can create hot spots that cause cracking. A similar effect occurs when substances, such as enamelled cookware or plastic utensils, melt onto the glass.Thermal shock occurs when cool glass is exposed to sudden heat. A common cause of cracks is when hot pots are placed onto a cold glass surface. The damage is immediate and often extensive.Other issuesIf the opening for the hob is too small the glass expands when hot and it can cause the Induction Hob to crack.Also if the crack only appears on one of the 'rings' this may be caused by a faulty thermal breaker. Should this occur please contact your Induction Hob manufacturer.If you have a cracked glass on your Induction Hob we recommend that you DO NOT use the hob until it has been repaired or replaced.