Why does the optical glass have no streaks after grinding?

     The streaks produced by ordinary glass are mainly caused by uneven batch materials; corrosion of refractory materials (mainly introduction of Al); and agitation during the manufacture of glass products.

     Therefore, optical glass should start from these aspects. The purity of raw materials is required to be > 99%, the impurities are less than a few parts per 100,000, and the particle size and weighing of raw materials have high requirements. Furnaces are made of ceramic or platinum as refractories. Generally, only casting method, rolling method, cylinder breaking method and liquid method are used for molding, which effectively prevents the glass from being stirred during molding.

     In addition, the structure of the melting furnace is also different from that of the daily glass melting furnace. It is divided into a melting pool (feeding), a regulating pool (regulating the melting atmosphere), a refining pool (clarification), and a homogenizing pool (stirring). The daily output of large furnaces is generally Only 5 tons.