The national standard classifies industrial sodium fluoroaluminate into three quality grades-Special, First, and Second-based on purity, establishing strict quantitative requirements for active ingredients, harmful impurities, and physical properties. Special-grade sodium fluoroaluminate contains ≥98.5% active ingredient; it strictly limits impurities such as iron, silicon, and moisture to ensure extremely low total impurity levels and stable electrolyte performance, making it suitable for high-precision applications like high-end electrolytic aluminum and specialty glass production. First-grade products contain ≥97.0% active ingredient with moderately relaxed impurity limits; offering balanced performance and high cost-effectiveness, they serve as the mainstream grade for general industrial use. Second-grade products meet basic industrial standards and are primarily suited for applications with lower purity requirements, such as ceramic glazes and the modification of ordinary abrasives. Products of all grades must meet physical specifications regarding moisture content, loss on ignition, and particle size uniformity to prevent quality issues such as caking or substandard purity.
The national standard establishes unified testing methods, inspection rules, and storage and transportation specifications to ensure standardized quality control across the industry. Composition analysis employs standardized chemical titration and instrumental analysis to precisely determine the content of core elements (fluorine, aluminum, and sodium) and various impurities, while physical properties are verified through compliant methods such as standard sieving, moisture content analysis, and fluidity testing. A batch-based sampling system is implemented for factory-exit inspections; every batch must be accompanied by a qualified test report, and substandard products are strictly prohibited from leaving the facility. Furthermore, the standard mandates uniform requirements for packaging specifications, labeling, transport protection, and storage conditions-explicitly requiring airtight, moisture-proof packaging, segregated storage, and separation from incompatible materials-thereby standardizing operations across the entire lifecycle from production and testing to dispatch and storage, ensuring stable product performance and regulatory compliance in industrial production.
