What kind of quartz sand is suitable for making Ultra-white glass?
1.Know Ultra Clear Glass
（1）Chemical composition of ultra-clear glass and common glass (mass fraction)/%
（2）Features of Ultra Clear Glass
| Low self-explosion rate of glass | Because the raw materials of ultra-white glass generally contain less impurities, the fine control in the process of melting raw materials makes ultra-white glass have a more uniform composition than ordinary glass, and its internal impurities are less , thus greatly reducing the possibility of self-explosion after tempering. . |
| color consistency | Since the iron content in the raw material is only 1/10 of that of ordinary glass, or even lower, it absorbs less of the green band in the visible range than ordinary glass, which ensures the consistency of the color of the glass. |
| High visible light transmittance, good permeability | Visible light transmittance greater than 91.5%, with crystal-clear crystal-like quality |
| Low UV transmittance | Compared with ordinary glass, ultra-clear glass has lower absorption of ultraviolet rays, and it can effectively reduce the passage of ultraviolet rays when used in anti-ultraviolet places. |
（3）Classification of ultra clear glass
2.Preparation of Ultra Clear Glass
The basic raw material of ultra-white glass is quartz sand, but the quality requirements for the quartz sand are very high, especially for the content of iron. When the iron content exceeds the standard, the thermodynamics in the quartz sand melting process is not easy to control, which will seriously affect the light transmission of glass products.
Requirements for quartz sand for ultra-clear glass (unit: wt%)
Granularity requirements of quartz sand for ultra-clear glass production
The production methods of ultra-clear glass mainly include rolling ultra-clear glass process and float ultra-clear glass process.
1. The process flow of rolling ultra-clear glass mainly includes raw sheet production and finishing
Production of the original film
Ingredients—melting—clarification—press molding—annealing—cutting—semi-finished product inspection—semi-finished product packaging—semi-finished product warehouse
fine processing
Semi-finished products - precision cutting - edging - cleaning - continuous tempering - finished product inspection - product packaging - product library
2.Float ultra-clear glass process mainly includes original sheet production, coating and tempering:
original film production
Ingredients—melting—clarification—tin bath—annealing—defect detection—slitting and cross cutting—original glass—storage
coating
Glass original sheet—cleaning—example source cleaning and activation—magnetron sputtering coating—online inspection—finished product packaging—warehousing
Tempering
Original glass sheet—cutting—edging and drilling—cleaning and drying—tempering—finished product inspection—product packaging—product delivery
