Many buyers often confuse tetrasodium pyrophosphate (TSPP) with sodium pyrophosphate decahydrate. In fact, they refer to two different forms of sodium pyrophosphate: anhydrous tetrasodium pyrophosphate and decahydrate sodium pyrophosphate. It is essential to distinguish between the two when selecting products for food processing, industrial manufacturing, water treatment, and detergent applications.

　　Sodium pyrophosphate is commercially available in two main specifications: anhydrous and decahydrate. Among them, anhydrous TSPP enjoys wider market demand and application scenarios. Food-grade TSPP is a legal, safe, and common food additive approved for global food production, while industrial-grade TSPP is widely adopted in water treatment, textile printing and dyeing, detergent formulation, and other industrial fields.

　　Basic Molecular & Physical Property Differences

　　1. Sodium Pyrophosphate Decahydrate

　　Sodium pyrophosphate decahydrate features the molecular formula Na₄P₂O₇·10H₂O with a relative molecular weight of 446.07. It appears as colorless transparent crystals or white crystalline powder. As a hydrated form of sodium pyrophosphate, it differs significantly from anhydrous TSPP in solubility, stability, and practical usage.

　　2. Anhydrous Tetrasodium Pyrophosphate (TSPP)

　　Anhydrous tetrasodium pyrophosphate (TSPP) has the molecular formulaNa₄P₂O₇ and a relative molecular weight of 265.90. It is a white fine powder that is fully soluble in water but insoluble in ethanol and other organic solvents. TSPP melts at 880°C with a relative density of 2.534, and its water solubility reaches 6.23 g at 20°C. Its aqueous solution shows weak alkalinity.

　　Production Process of High-Purity TSPP | Chuandong Chemical

　　Chuandong Chemical Group specializes in the production of high-quality industrial-grade and food-grade tetrasodium pyrophosphate (TSPP). We adopt the advancedthermal phosphoric acid process to guarantee stable product quality and low impurity content.

　　Our production process applies high-purity thermal-process phosphoric acid (low arsenic) as the core raw material, matched with qualified soda ash or caustic soda. After precise neutralization, dry dehydration, and high-temperature polymerization, the finished anhydrous TSPP is finalized. Strict raw material screening and standardized production procedures ensure our TSPP features high purity, stable alkalinity, and excellent physical and chemical properties.

　　Application Preference: Anhydrous TSPP vs Decahydrate

　　In both food-grade and industrial-grade scenarios, anhydrous tetrasodium pyrophosphate (TSPP) is far more widely used than sodium pyrophosphate decahydrate. Anhydrous TSPP boasts better stability, lower moisture content, and more adaptable solubility, making it the preferred choice for most industrial and food processing production worldwide.