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Monopotassium phosphate

CAS Number
7778-77-0
EC Number
231-913-4
Chemical Formula
H3O4P.K
Molecular Weight
136.086 g/mol

Description

Monopotassium phosphate (CAS 7778-77-0 ), commonly sourced as MKP or E340i , is an inorganic potassium salt used across food, agricultural, and industrial sectors as a pH buffer, nutrient source, and sequestrant. Its dual potassium and phosphorus content makes it a preferred input wherever both minerals must be delivered simultaneously in a controlled, soluble form. In food and beverage manufacturing, MKP functions as a buffering agent. It is used in sports drinks, dairy products, and processed foods where pH consistency directly affects shelf life and texture. Fertilizer producers and hydroponic growers rely on it as a fully water-soluble NPK input. This is particularly useful in drip irrigation and foliar feed systems where nutrient uptake efficiency is critical. Pharmaceutical formulators use it to prepare buffer solutions and as an excipient in oral preparations. These preparations meet strict compendial standards for safety and efficacy. Water treatment operations apply it for corrosion inhibition in distribution systems by controlling mineral scaling and sequestering metal ions. Monopotassium phosphate is supplied as a white crystalline powder or granule. Standard grades include food-grade ( FCC , E340i), USP / BP for pharmaceutical applications, and technical grade for industrial use. Fertilizer-grade material is also available with defined purity specifications suited to fertigation programs. Other available standards include Ph.Eur. , EP , and ACS grades to meet specific regional or laboratory requirements. Contact us for supply of Monopotassium phosphate Request Quote

Other Names (Synonyms)

MKP | KDP | potassium dihydrogen phosphate | Potassium phosphate | Sorensen's potassium phosphate | Potassium phosphate,monobasic | Potassium phosphate monobasic (anhydrous) | Potassium dihydrogen orthophosphate | E340i

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point253 °C
Boiling Point> 450 °C
Density2.34 g/cm³
AppearanceWhite powder
ColorWhite transparent
OdorOdorless
Formpowder
Water Solubility222 g/L (20 ºC)
Vapor Pressure0Pa at 25℃
Refractive Index1.4864
pH4.2-4.6 (20g/l, H2O, 20℃)

Trade & Regulatory

HS Code28352400
Storage Class11 - Combustible Solids
WGK (Germany)2