Tempered glass is a type of safety glass treated thermally or chemically to increase its strength compared to ordinary glass.
In the case of heat treatment, the glass is passed through a furnace that heats it far above the transition temperature (564 °C) to about 620 °C.
At the end of the step, the glass is cooled rapidly with forced air at about 20 °C, while the inner portion remains free to flow for a short time.
Along the entire length of the oven, al below each burnedre, there is a pair of bearings, shielded from the heat by a double metal mat, which turn very slowly ewhich, by induction,reach temperatures close to 300°C.Under these operating conditions, reliable lubrication of an acceptable to ensure defect-free and costly scrap-free production, is no easy feat.
Most commercially available fats do not provide sufficient performance. The only grease that met the wishes of major tempered glass manufacturers was KRYTOX 227 by Chemours which demonstrated greater temperature resistance and longer times between relubricationsrequired.
