There are four grades of float glass, it is distinguished by bubbles, impurities, scratches,and lines on the appearance.
1 Mirror Glass. There is no scratches on the glass appearance. The flatness is fine, it is the top quality glass, could be used to produce mirror.
2 Automotive Glass. The appearance is clean, there is no bubbles and scratches to the naked eyes. The quality is very high. It is also used in the furniture and appliance.
3 Construction Glass. There are few bubbles, scratches and stones in glass. Mainly used in curtain wall, the quality requirements is not high.
4 Unqualified Glass. The quality is bad, couldn’t meet the glass standard.