COIMBATORE TOUGH AND GLASS MANAUFACTURER ToughGlass V Tuff Bend & Curved Glass uses this toughening technique though a horizontal tempering furnace while bending the glass to specific shapes. It is one of the few curved toughening furnaces and it is the only one with a tight radius capabilities, it provides a wide range of applications in architectural, commercial and residential installations. The capabilities range from cylindrical single curves to complex non cylindrical with tight radius curves and tangents.