Core Viewpoint - The article emphasizes the critical role of quartz sand in the glass industry, highlighting its importance in various glass products and the stringent quality requirements based on chemical composition, stability, and particle size [1]. Group 1: Classification of Quartz Sand for Glass Industry - The industry standard "QB/T 2196-1996" outlines the classification and testing methods for quartz sand used in the glass industry, applicable to processed quartz sand [2]. Group 2: Flat Glass - Different downstream markets for flat glass have varying requirements for quartz sand, categorized into Class I and Class II based on Al2O3 content [3]. - The industry standard "JC/T 529-2000" specifies the chemical composition and particle size requirements for quartz sand used in flat glass [4]. Group 3: Daily Use Glass - Daily use glass products include bottles, containers, and medical glass, with quartz sand being a significant raw material [5]. - The melting temperature of quartz sand is approximately 1730°C, and the particle size significantly affects glass formation [6]. Group 4: Ultra-Clear Glass - Ultra-clear glass, known for its high light transmittance (≥91.5%) and low iron content (100-150 ppm), has strict raw material composition requirements [7]. - The primary raw materials for ultra-clear glass include quartz sand, feldspar, and limestone, with specific percentage requirements for each component [8]. Group 5: Photovoltaic Glass - Photovoltaic glass protects solar cells and must have low iron content, high light transmittance, and resistance to corrosion and high temperatures [9]. - The industry standard "JC/T 2314-2015" outlines the quality requirements for quartz sand used in photovoltaic glass [10]. Group 6: Quartz Glass - Quartz glass, known for its exceptional mechanical, thermal, optical, and electrical properties, is primarily made from high-purity quartz sand [12]. - The performance characteristics of quartz glass include high transmittance across UV, visible, and infrared spectra, high-temperature resistance, and low thermal expansion [13]. Group 7: Impurity Requirements for Quartz Sand - The impurity content requirements for quartz sand vary by industrial application, with strict limits on elements like Al, Fe, and Ti for high-end uses such as semiconductors and optical devices [14].