Tempering Tempering, also called thermal tempering or heat strengthening, subjects glass to precisely controlled heating and rapid cooling. The Heat Treated Glass is heated to its softening point, then quickly cooled by blasting air onto the surface. This introduces compressive stresses in the surface and balancing tensile stresses within. The result is around 4 times greater stre... https://hallbook.com.br/blogs/490946/Heat-Treated-Glass-An-Overview-of-Different-Types-and-Their