Sodium Thiosulfate Pentahydrate, known scientifically by its CAS number 10102-17-7, is a hydrated inorganic salt that plays a significant role across a spectrum of industrial and scientific disciplines. Characterized by its colorless crystalline appearance and excellent water solubility, this compound, often referred to as 'hypo,' possesses unique chemical properties that make it indispensable for specific applications. Understanding these properties is key for professionals seeking to procure and utilize this versatile chemical effectively.

The chemical formula for Sodium Thiosulfate Pentahydrate is Na2S2O3·5H2O. Its structure indicates five molecules of water of crystallization, which are crucial to its physical form and stability. The compound has a melting point of approximately 48.5°C, and its density is around 1.73 g/cm³. A notable characteristic is its tendency to effloresce, meaning it can lose its water of crystallization when exposed to dry air. This property necessitates appropriate storage conditions, typically in cool, dry environments, to maintain its integrity. For businesses looking to purchase this chemical, these physical attributes are important considerations for handling and application.

One of the most prominent industrial applications of Sodium Thiosulfate Pentahydrate is its function as a dechlorinator. In processes like pulp and paper manufacturing, and textile dyeing and finishing, it is used to efficiently remove residual chlorine after bleaching. This prevents damage to delicate materials and ensures the quality of the final product. Manufacturers in these sectors often seek reliable suppliers that can provide technical-grade Sodium Thiosulfate Pentahydrate to meet their large-scale production demands. The ability to purchase this chemical with a high assay (≥99%) is crucial for achieving optimal results.

Beyond its role in material processing, Sodium Thiosulfate Pentahydrate is recognized for its utility in photography. Historically, it served as a critical fixing agent in developing photographic films and prints, dissolving unexposed silver halide crystals from the emulsion. While digital photography has reduced this application's scale, it remains relevant in specialized areas and for historical photographic processes.

Furthermore, the compound finds application in the food industry as a chelating agent and antioxidant, helping to preserve food quality and extend shelf life. In the pharmaceutical sector, it can be used in certain formulations as a mild disinfectant or detergent. These applications demand high-purity grades, often necessitating a rigorous selection of suppliers who can guarantee compliance with stringent regulatory standards.

For procurement managers and scientists, identifying the right supplier is paramount. When looking to buy Sodium Thiosulfate Pentahydrate (CAS 10102-17-7), it is advisable to partner with manufacturers who offer consistent purity and reliable supply. Understanding the product's physical properties, such as its crystalline form and melting point, alongside its chemical reactivity, ensures that it can be effectively applied across diverse industrial needs. Whether for water treatment, textile bleaching, or niche chemical applications, Sodium Thiosulfate Pentahydrate remains a fundamental compound in modern industry.