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Potassium dihydrogen phosphate

Short Description:

Chemical Name: Potassium dihydrogen phosphate

Common Name: MKP

Molecular Formula: KH2PO4

Molecular Weight: 136.0856

CAS No.: 7778-77-0


FOB Price: US $850 – 1050 / Ton

Min.Order Quantity: 1×20′FCL

Supply Ability: 10000 Tons per Month

Port: Huangpu

Payment Terms: L/C,D/A,D/P,T/T

Product Detail

Product Tags

Quick Detail

Product name Potassium dihydrogen phosphate
Other name MKP
Chemical Formula KH2PO4
State Power
CAS No 7778-77-0
Color White


Items Specifications: Test Results Unit

Main content (KH2PO4)


98.5 %



52.2 %



34.5 %
PH Value 4.4-4.8


As 0.001max


Water insoluble 0.1max




Fertilizer-grade MKP powder contains the equivalent of 52% P2O5 and 34% K2O, and is labeled NPK 0-52-34.

MKP powder is often used as a nutrient source in the greenhouse trade and in hydroponics.

As a crystal, MKP is noted for its non-linear optical properties. Used in optical modulators and for non-linear optics such as second-harmonic generation

Also to be noted is KDP, potassium dideuterium phosphate, with slightly different properties. Highly deuterated KDP is used in nonlinear frequency conversion of laser light instead of protonated (regular) KDP due to the fact that the replacement of protons with deuterons in the crystal shifts the third overtone of the strong OH molecular stretch to longer wavelengths, moving it mostly out of the range of the fundamental line at ~1064 nm of neodymium-based lasers. Regular KDP has absorbances at this wavelength of approximately 4.7–6.3% per cm of thickness while highly deuterated KDP has absorbances of typically less than 0.8% per cm.

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