Specification parameters

中文名称	三聚磷酸钠
中文别名	磷酸五钠; 焦偏磷酸钠; STPP; 三聚磷酸五钠
英文名称	Sodium Tripolyphosphate
CAS NO.	7758-29-4
分子式	Na5P3O10
分子量	367.86413
分子结构
熔点	622℃
水溶性	20 g/100 mL (20℃)

Essential information

Sodium tripolyphosphate classification code GBl5.003, INS451 (i). Chemical structure: This product is a type of amorphous water-soluble linear polyphosphate, terminated at both ends with Na2PO4, with the chemical formula Na5P3 O10 and a relative molecular weight of 367.86. Commonly used in food as a moisture retention agent, quality improver, pH regulator, and metal chelating agent.

Application area 

Industry
Used as a detergent additive, it can also be used in petroleum, metallurgy, mining, papermaking, water treatment, etc. Mainly used as an additive for synthetic detergents, as a soap enhancer and to prevent soap oil precipitation and frosting. It has a strong emulsifying effect on lubricating oil and fat, and can be used to adjust the pH value of buffer soap solution. Softener for industrial water. Leather making agent. Dyeing auxiliaries. Used as dispersants in the preparation of suspensions in industries such as paint, kaolin, magnesium oxide, and calcium carbonate. Drilling mud dispersant. The paper industry uses it as an oil repellent. A quality improver and moisture retention agent used in the food industry for canned food, fruit juice beverages, dairy products, soy milk, and other products. Mainly used for tenderizing canned ham and softening the skin of canned fava beans. It can also be used as a softener and thickener.
STPP also has its inevitable environmental hazards, as it contains phosphorus and can easily cause eutrophication of water bodies.
Due to the implementation of the national phosphorus restriction policy, the application of sodium tripolyphosphate in detergent additives has gradually decreased and is being replaced by products such as layered sodium silicate and molecular sieves.

Packaging, Storage, Transportation, and Safety

Risk terms: R36/37/38: Irritating to eyes, respiratory system and skin. Stimulating the eyes, respiratory system, and skin.
Security term: S24/25: Avoid contact with skin and eyes. Avoid contact with skin and eyes.
Attention: S24/25void contact with skin and eyes. Avoid contact with skin and eyes.
S26 In case of contact with eyes， rinse immediately with plenty of water and seek medical advice。
After accidental contact with the eyes, please rinse immediately with plenty of water and seek medical advice.
S36 Wear suitable protective clothing。

Wear appropriate protective clothing.
Storage and transportation: Store in a sealed container. Store in a cool, dry, well ventilated place away from incompatible substances. Storage is beneficial for protected moisture.