Sodium Tripolyphosphate STPP
Molecular Formula：Na5P3O10
Molecular Weight：367.86
Properties： White crystal (melting point: 622℃), hygroscopic and soluble in water that makes an alkaline solution and have capacity of complexing metal ions, such as Ca2+ Mg2+ Fe2+ Fe3+ ect. and effect of colloidization, emusification dispersion and buffering.
Specification: GB9983-88
Characteristics Value
Excellent Grade 1 Grade 2
Sodium Tripoly Phosphate %≥ 96 90 85
P2O5 %≥ 57.0 56.5 55.0
Water insoluble matter %≤ 0.10 0.10 0.15
Iron (Fe) %≤ 0.007 0.015 0.030
PH Value (1% solution) 9.2-10.0
White degree %≥ 90 80 70
The over screen (with 1.00mm testing screen) %≤ 5.0
Apparent density g/cm3 0.35-0.99
Content of phase Ⅰ % 5-50
Special requirements may be through negotiation.
Usage: Mainly used as builder in making detergent, also for the use of petroleum, Ceramic, mining, metallurgy industry & water treatment and such fields.
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