POTASSIUM PHOSPHATE- ▸ Fertilizer: Water-soluble phosphorus-potassium source for fertigation and foliar feeding.
- ▸ Food additive: Buffering and sequestering agent.
- ▸ Fermentation nutrient: Phosphorus-potassium nutrient in microbiological and fermentation media.
- ▸ Specialty buffers: pH buffer in technical and laboratory formulations.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Monopotassium phosphate (MKP, potassium dihydrogenphosphate; CAS 7778-77-0) is a fully water-soluble potassium phosphate salt. It is used as a high-analysis phosphorus-potassium fertilizer for fertigation and foliar feeding, as a buffering and sequestering agent in food, and as a phosphorus-potassium nutrient in fermentation and microbiological media.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 231-913-4
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Managing pH and Compatibility in Fertigation (Agriculture)
- Water-Soluble Fertilizer Salts for Fertigation (Agriculture)
Frequently Asked Questions
What is monopotassium phosphate (MKP) used for?
Monopotassium phosphate (MKP, CAS 7778-77-0) is a fully water-soluble potassium phosphate salt used as a high-analysis phosphorus-potassium fertilizer for fertigation and foliar feeding, as a buffering and sequestering agent in food, and as a phosphorus-potassium nutrient in fermentation and microbiological media. We supply it in bulk to fertilizer blenders, food processors, and fermentation operations.
Is monopotassium phosphate water soluble?
Yes. MKP (potassium dihydrogen phosphate) is fully water-soluble, which is why it is used as a clear-solution source of phosphorus and potassium in fertigation, foliar feeds, and liquid nutrient and buffer formulations.
What is the formula for monopotassium phosphate?
The molecular formula is H2KO4P (KH2PO4), CAS 7778-77-0. It is the monobasic potassium salt of phosphoric acid, supplying both potassium and phosphorus in a single soluble salt.
What grades and bulk packaging are available for MKP?
We supply MKP in bags, drums, totes, and bulk. Fertilizer-grade and other technical specifications are confirmed at quotation with the corresponding CoA. Contact us with your application and volume for a bulk quote.
What is the cost of bulk monopotassium phosphate?
Bulk MKP pricing varies with grade, packaging, volume, and market conditions. Request a quote with your target quantity and ship-to location for current pricing and lead time.
What is the REACH and TSCA regulatory status of Monopotassium Phosphate (MKP, Potassium Dihydrogen Phosphate)?
Monopotassium Phosphate (MKP, Potassium Dihydrogen Phosphate) (CAS 7778-77-0) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 231-913-4).