1. Ordinary flat glass and float glass are flat glass. It is just a different production process and quality. Ordinary flat glass is made of quartz sandstone powder, silica sand, potassium fossil, soda ash, thenardite and other raw materials. It is prepared according to a certain ratio and is melted at high temperature by the melting furnace. It is transparent and colorless by vertical drawing method or flat drawing method and calendering method. plate glass. Ordinary flat glass is divided into three categories according to the quality of appearance, first-class products and second-class products. According to the thickness, it is divided into five types: 2, 3, 4, 5, and 6 mm.
2. Float glass is prepared by using sea sand, quartz sandstone powder, soda ash, dolomite and other raw materials according to a certain ratio. After melting at high temperature, the molten glass flows continuously from the kiln to float on the metal surface. A glass ribbon with a uniform thickness and a polished surface, which is cooled and hardened and then detached from the molten metal, and then annealed and cut into a transparent colorless flat glass. The surface of the glass is particularly smooth and smooth, the thickness is very uniform, and the optical distortion is small. According to the appearance quality, float glass is divided into three categories: excellent products, first-class products and qualified products. According to the thickness, it is divided into three types: 3, 4, 5, 6, 8, 10, and 12 mm.
3. The quality grade of ordinary flat glass is judged according to the number of defects such as ribs, bubbles, scratches, sand, enamel, and wire. The appearance quality level of float glass is judged based on the number of defects such as optical distortion, air bubbles, inclusions, scratches, lines, and fog spots.
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