Sodium Tripolyphosphate Powder 25kg 99% Content Water Retention Agent Pickling Agent Detergent Food Grade Ceramic High Content

Product Name

Sodium Tripolyphosphate (Food Additive Grade)

English Name

Sodium Tripolyphosphate

English Abbreviation

STPP

Molecular Formula

Na₅O₁₀P₃

Molecular Weight

367.86

CAS Number

7758-29-4

EINECS Number

231-838-7

Net Weight

25kg per bag

Purity (STPP)

≥90%

Appearance

White powder or granular crystal with good fluidity; slightly yellow/grey when purity is low

Density

Type I: 2.62g/cm³; Type II: 2.57g/cm³ (depending on crystal form)

Solubility

Easily soluble in water (alkaline aqueous solution); ~13g dissolves in 100g water at room temperature; gradually hydrolyzes to ortho-/pyrophosphate in water

Hydration Property

Two types: anhydrous (Type I: high-temp; Type II: low-temp) and hexahydrate; Type I hydrates fast (exothermic, easy to cake); Type II hydrates slowly

Chelation Ability

Extremely strong; forms soluble complexes with metal ions (Ca²⁺, Mg²⁺, Cu²⁺, Fe²⁺, etc.)

Hydrolysis Reaction

Gradually hydrolyzes to phosphite in water; Hexahydrate stable below 80℃, dehydrates to NaH₂PO₄ + Na₄P₂O₇ at 85-120℃, re-forms STPP above 120℃

Food Additive

Water retention/tenderization for meat products; water retention/tenderization/swelling/bleaching for aquatic products; quality improvement for canned goods/dairy/juice drinks

Refractory Additive

Binder for alkaline refractories, accelerates hardening & improves strength

Cement Retarder

Chelates Ca²⁺ to delay hydration, extend setting time, reduce concrete slump

Detergent Additive

Promotes dirt dispersion & enhances detergency (Note: Phosphorus-containing wastewater causes eutrophication, restricted in laundry detergent)

Ceramic Water Reducer

Improves slurry performance (moderate viscosity, good fluidity, uniform stability at low moisture)

Water Treatment Agent

Softens hard water, prevents scaling, extends equipment life, improves system efficiency

Mineral Flotation Agent

Used in mineral flotation (separates valuable minerals from gangue)

Papermaking

Sizing for paper (improves water resistance & strength); combines with cellulose to form a protective film (prevents water penetration, enhances fiber bonding)

Ceramic Body Deflocculant

Reduces body viscosity, improves forming/drying performance, smoothens surface, reduces defects

One-step Method

Heat-dried/wet phosphoric acid neutralized with alkali → Na₂HPO₄ + NaH₂PO₄ neutral liquid → direct polycondensation to STPP

Two-step Method

Heat-dried/wet phosphoric acid neutralized with alkali → Na₂HPO₄ + NaH₂PO₄ neutral liquid → spray-dried to orthophosphate → calcined polycondensation to STPP

Storage Conditions

Store in cool, dry indoor area; avoid direct sunlight & high temperature

Operation Safety

Avoid prolonged contact/eye exposure when using detergent-containing STPP to prevent injury