Sodium Tripolyphosphate（STPP）

Chemical Name: Sodium Tripolyphosphate（STPP）
Molecular Formula: Na₅P₃O₁₀
Molecular Weight: 367.86
CAS No. : 7758-29-4
Standard Executed: GB 25566-2010,GB/T 9983-2004

Appearance
White crystalline powder or granule.

Application
• Main auxiliaries for synthetic detergents, industrial water softeners, tanning pretanning agents, dyeing auxiliaries, catalysts for organic synthesis, dispersants for the pharmaceutical industry;
• Food additives, which are commonly used in food products as moisture retaining agents, quality modifiers, pH adjusters, and metal chelating agents.

Packing
• Net weight : 25，1000kg;
• PP woven bag, with inner PE plastic bag.

Specification

Item	Standard
	Food grade	Industrial grade
	Food grade	Superior-grade	First-grade
Sodium tripolyphosphate (Na₅P₃O₁₀), ω/% ≥	85.0	96.0	90.0
Total phosphate (as P₂O₅), ω/%	56.0～58.0	≥57.0	≥56.5
Water insoluble matter, ω/% ≤	0.1	0.10	0.10
Iron (Fe), ω/% ≤	---	0.007	0.015
Fluoride (as F), / (mg/kg) ≤	50	---	---
Arsenic (As)/(mg/kg) ≤	3	---	---
Heavy metals (as Pb)/(mg/kg) ≤	10	---	---
Lead (Pb)/(mg/kg) ≤	4	---	---
Whiteness/% ≥	---	90	85
PH (1% solution)	---	9.2-10.0
Granularity (through 1mm test sieve) / % ≥	---	95

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