Thermal breakage refers to the cracking of annealed glass cracking due to the build-up of excessive thermal stress developed because of a differential in temperature across the glass. As there is more risk associated with glasses which absorb more solar heat within the body of the glass, there is increased risk of a solar control glass being more susceptible to thermal fracture. We would always recommend that a thermal safety check be undertaken when a solar control glass is being specified to determine whether the glazing is at risk from thermal fracture. An effective way to eliminate breakage by thermal fracture is to heat strengthen or toughen the glass.