Thiourea is an organic sulfur compound commonly used in the chemical industry. Thanks to its complexing, reducing, and catalytic properties, it is widely used in metallurgy, electroplating, fine chemicals, pharmaceutical synthesis, and other fields. Procurement and production personnel often confuse standard industrial-grade thiourea with high-purity thiourea, assuming that the two differ only in name and offer similar performance. In fact, these grades differ significantly in purity specifications, impurity control, production processes, suitable applications, and performance consistency. Using the wrong grade can directly affect product quality and may even result in production line losses and scrapped materials.