The stripe of common glass, mainly because of the material is not uniform; refractory material corrosion (mainly introduces Al); the stirring of the production of glass products produced.

So optical glass from the several aspects, the raw material requirements of >99% purity, impurities are less than one hundred thousand minutes, and the size of the raw materials, the scale has a high demand. Take the pot or platinum as refractory ceramics. In general, the casting method, the rolling method, the broken cylinder method and the liquid method are used to prevent the stirring of the glass in the forming process.

Also furnace structure and daily-use glass furnace is not the same, it is melting pool (feeding), regulation pool (adjust the melting atmosphere), refining pool (clear), equalization basin (mixing), large furnace Nissan amount is generally only 5 tons.