Potassium Metaphosphate, E341, CAS no.7758-87-4, also known as MKP, appears as a white powder or granular, odorless, slowly soluble in water, potassium salt of phosphoric acid.

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Potassium Metaphosphate Specification
ITEM STANDARD
APPEARANCE WHITE POWDER
CONTENT(As P2O5),% 59 61.0
As, % 0.0003max.
HEAVY METALS % 0.0015max.
Pb,% 0.0002 max
Hg,% 0.0001 max
Cd,% 0.0001 max
VISCOSITY 6.5 15
F, % 0.001max
LOSS ON DRYING % 5.0max