Sodium tripolyphosphate is an inorganic substance with the chemical formula Na5P3O10. It is a kind of amorphous water-soluble linear polyphosphate. Sodium tripolyphosphate has two crystalline states: type I (high-temperature type) and type II (low-temperature type). The difference lies in their different bond lengths and bond angles. Their chemical properties are the same, but the thermal stability and hygroscopicity of type I are higher than that of type II.

Sodium Tripolyphosphate STPP

Technical Parameters of Sodium tripolyphosphate CAS 7758-29-4

Items	Appearance	Fluoride	Na5P3O10	P2O5	Water Insoluble	pH Value	Heavy metals( Pb)
Standard	White Granular or Powder	0.0030% Max	95% min	57.0% min	0.05% max	9.5-10.0	10ppm Max

Product characteristics of Sodium tripolyphosphate CAS 7758-29-4

Sodium tripolyphosphate has the functions of chelation, suspension, dispersion, gelling, emulsification, and pH buffering. It can be used as the main additive of synthetic detergent, industrial water softeners, tanning pre-tanning agents, dyeing additives, organic synthesis catalysts, industrial dispersants, and food additives.

Precautions of Sodium tripolyphosphate CAS 7758-29-4

1. Sodium tripolyphosphate is non-toxic and harmless, biodegradable, but not edible.

2. If it gets into the eyes, it should be rinsed with plenty of water in time.

3. If you cause allergies to part of the human body, you should consult a doctor in time.

FAQs of Sodium tripolyphosphate CAS 7758-29-4
Q: How does STPP affect the environment?
A: STPP used to be an important ingredient in household laundry detergents and dishwashing detergents. However, due to its high phosphorus content, excessive discharge into the environment can lead to eutrophication of water bodies and promote excessive growth of algae, thus disturbing the ecological balance. Therefore, in many countries and regions, regulations have limited the amount of STPP used in household cleaning products or banned it as a detergent ingredient altogether. Nevertheless, the use of STPP in industrial applications is still allowed in moderate quantities, and measures are taken to ensure that wastewater is effectively treated to minimize the release of phosphorus.

Q: Is STPP harmful to human health?
A: Under normal conditions of use, STPP is considered relatively safe. However, direct contact with large quantities of STPP powder may irritate the skin or eyes, and inhalation of the dust may cause respiratory distress. For most individuals, exposure to low concentrations of STPP through food or drinking water does not pose a threat to human health. However, for certain sensitive individuals, such as those with kidney disease, chronic ingestion of higher levels of phosphorus may require caution. Therefore, it is important to follow the manufacturer's safety guidelines as well as local regulations.

Q: How does STPP improve washing performance?
A: STPP is effective in improving the detergency of laundry products mainly because of the following properties: Water softening: It binds to calcium and magnesium ions in water to form a soluble complex, which reduces water hardness and makes it easier for surfactants to be effective. Dispersing action: STPP helps to suspend stain particles in the water, preventing them from re-adhering to the fabric and ensuring that clothes are cleaned more thoroughly. PH regulation: It maintains a stable pH in alkaline environments, which helps activate some specific types of cleaning ingredients, such as enzymes, to more effectively remove protein matrices or other stubborn stains.

Q: Can STPP be replaced by alternatives and what are the characteristics of these alternatives?
A: With increasing environmental awareness and technological advances, a variety of alternatives to STPP have emerged in the marketplace, designed to reduce phosphorus contamination while maintaining good wash results. Common alternatives include: Zeolite: A naturally occurring mineral that can be used as a water softener, but does not have the strong dispersing ability and pH adjustment of STPP. Organic polymers: such as polyacrylates or polycarboxylates, which also provide some dispersibility and water softening with less environmental impact. Sodium Silicate: Although not a perfect substitute, it can partially replace STPP in some applications, especially excelling in low temperature washing conditions.