High-purity thiourea is widely used in industries with strict impurity control requirements, such as electronic electroplating, scientific research experiments, and fine synthesis. Compared with standard industrial-grade thiourea, high-purity thiourea is more sensitive to storage conditions. Improper storage may lead to moisture absorption and caking, oxidation and deterioration, or the introduction of external impurities. Even if the product passes factory inspection, these issues may cause plating bath contamination, deviations in experimental data, and reduced quality of synthesized products during use. Therefore, standardized storage is essential to ensuring the quality of high-purity thiourea.