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STPP 94% Sodium Tripolyphosphate
RAW MATERIAL
STPP

STPP 94% Sodium Tripolyphosphate

STPP 94% Sodium Tripolyphosphate is a white, water-soluble phosphate powder used as a water softener, buffering agent, dispersant, and detergent auxiliary.

Chemical Name
Sodium Tripolyphosphate
Molecular Weight
367.86 g/mol
Molecular Formula
Na5P3O10
EINECS
231-838-7
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PRODUCT OVERVIEW

Product Description

STPP 94% Sodium Tripolyphosphate is a white, water-soluble inorganic phosphate powder widely used as an auxiliary ingredient in detergent and cleaning formulations. It functions primarily as a water-softening, buffering, emulsifying, and dispersing agent. In detergent systems, STPP helps control water hardness, supports soil dispersion, assists pH control, and helps maintain the free-flowing properties of powder formulations. The product is also used in applications such as food processing, papermaking, oil drilling mud, ceramics, mining, and water-treatment systems.
PRODUCT PARAMETERS

General Parameters

Appearance
white powder
Melting Point
622ºC
Density of Phase I
2.62g/cm3
Density of Phase II
2.57g/cm3
Solubility
Soluble in water, 20g/100mL (20ºC)
KEY PROPERTIES

Product Characteristics

Detergent grade is available with different Phase I and Phase II profiles.
Food-grade variants control arsenic, heavy-metal, and fluoride content.
Big granular STPP is available as a low-density form.
TECHNICAL SPECIFICATIONS

Specification Data

Specification Standard
Purity (Na5P3O10) by wt % 94.0 min
P2O5 by wt % 56.5 min
Pyrophosphate (Na4P2O7) by wt % 4.0 max
Orthophosphate and Metaphosphate by wt % 2.0 max
Iron Content (as Fe) by wt % 0.01 max
Water Insoluble by wt % 0.10 max
Bulk Density, g/ml 0.9~1.15
Phase I by wt % 15~40
Whiteness, % 85 min
pH Value (1% Solution) 9.2~10.3
Particle Size (100 Mesh Pass by wt %) 95 min
APPLICATIONS

Typical Uses

✓
Used as a water-softening and buffering auxiliary in detergent and cleaning formulations.
✓
Used for quality modification and pH adjustment in applicable food-processing formulations.
✓
Used as an auxiliary material in papermaking applications.
✓
Used as a dispersing agent in oil-drilling mud systems.
✓
Used in ceramic, mining, and water-treatment applications.
STORAGE & HANDLING

Handling Guidance

Store in suitable sealed packaging in a clean and dry storage area. Protect from direct sunlight, moisture, and incompatible materials. Keep the product properly sealed to help preserve its physical quality and free-flowing condition. Follow the actual supplier COA, SDS, and technical documentation for final storage and handling requirements.
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