According to the use of the by-product zinc iodide solution, the products are divided into Class I, Class II and Class III. Based on their production conditions and user needs, standard technical indicators are drawn up, including appearance quality, zinc iodide mass concentration, and iodine element concentration. , and determine the indicator value. This standard has 8 chapters in total: 1. Scope; 2. Normative reference documents; 3. Terms and definitions; 4. Technical requirements; 5. Test methods; 6. Inspection rules; 7. Marking, packaging, transportation and storage; 8. Safety.