With the rapid development of China’s new material industry and rising compliance requirements for export trade, various testing standards in the silica industry are being continuously revised and improved. A multi-dimensional testing system covering basic physical and chemical indicators, safety, environmental protection and impurity limits has been gradually implemented. Standardization construction is reshaping the rules for production control, quality acceptance and market access of silica, serving as an important tool to regulate industrial development and phase out inferior products. For a long time in the past, silica testing mainly focused on basic physical and chemical parameters such as specific surface area, oil absorption value, particle size and moisture content, with relatively limited testing items. Many segmented application fields lacked dedicated standards, and some enterprises formulated internal control indicators on their own. Differences in testing methods and test conditions among manufacturers often led to inconsistent results for the same sample tested at different institutions, bringing much trouble to downstream customers in formula selection and product acceptance.

　　In recent years, downstream industries including tires, lithium battery separators, toothpaste, food contact materials and high-end coatings have put forward higher requirements for impurity control and safety performance of silica, driving the addition of multiple testing items in the industry. Indicators such as heavy metals, polycyclic aromatic hydrocarbons, volatile organic compounds, microorganisms and chloride ions have been gradually included in routine testing lists for high-grade silica. For instance, silica for toothpaste has strict limits on heavy metal content and abrasion value to ensure safety for oral use. Special silica for lithium battery separators focuses on controlling metal ion content to prevent potential battery safety hazards caused by metallic impurities. Silica used in food contact materials also needs to pass migration tests to meet relevant food safety regulations. These new testing items impose higher requirements on testing instruments, laboratory environments and the professional competence of operators. Small enterprises often struggle to equip a full set of testing equipment, highlighting obvious shortcomings in product quality control.

　　The updating of standards has also transformed the quality control model at the production end. Previously, many silica enterprises adopted finished product sampling inspection, only taking samples after production was completed. Guided by the new standards, an increasing number of enterprises have established full-process quality monitoring systems, setting sampling and testing nodes at every link from raw material incoming inspection, reaction synthesis, filtration and drying to finished product packaging. This helps detect production fluctuations in advance and reduce the output of non-conforming products. Leading enterprises have built standardized laboratories, introduced precision analytical instruments such as gas chromatography, liquid chromatography and atomic absorption spectroscopy, and established complete testing records to achieve traceable product quality, better meeting audit requirements from major downstream customers and overseas purchasers.

　　In terms of import and export trade, discrepancies between domestic and international testing standards once acted as one of the major obstacles for domestic silica to enter global markets. Regions including the EU and North America have set stringent requirements for chemical registration, impurity limits and safety assessment for powder materials. In the early stage, many domestic enterprises were unfamiliar with overseas standards and lacked complete testing items, making it difficult for their products to access high-end overseas supply chains. As domestic silica standards gradually align with international specifications, enterprises have upgraded their testing capabilities and carried out special tests in accordance with the requirements of overseas customers. The compliance level of domestic silica keeps improving, and the recognition of exported products continues to rise. Meanwhile, the domestic market has also begun to set access thresholds in line with international standards, leaving shrinking room for non-standard low-quality products to seize the market merely by low prices.

　　Nevertheless, the industry still faces practical challenges in the implementation of standards. The updating speed of special standards for some segmented fields cannot keep pace with the iteration of new material technologies, and corresponding testing specifications are temporarily unavailable for certain emerging application scenarios. Differences in testing methods among various laboratories still result in deviations in test data, forcing enterprises to invest more costs in comparative tests. In addition, high-end testing equipment and professional testing personnel come at high costs. A large number of small and medium-sized silica enterprises cannot afford to build complete laboratories and have to rely on third-party testing institutions, extending testing cycles and increasing costs for product development and delivery.

　　Industry experts point out that standardization lays the foundation for high-quality development of the silica industry. In the future, with continuous iteration of downstream new materials, special standards for silica subcategories will be supplemented and improved, and testing items and test methods will be further unified. Quality standards will continuously drive the survival of the fittest in the industry, and production capacity with weak quality control and incomplete testing systems will gradually exit the market. A unified and standardized testing system can not only reduce quality disputes between upstream and downstream enterprises and stabilize supply chain cooperation, but also continuously improve the overall quality of domestic silica, helping more high-performance powder products enter high-end domestic markets and global trade markets.