POTASSIUM CHLORIDE- ▸ Fertilizer: Primary potassium source (muriate of potash)
- ▸ Potassium chemicals: Feedstock for other potassium compounds
- ▸ Oilfield fluids: Shale-stabilizing salt in drilling and completion brines
- ▸ Industrial reagent: Electrolyte and buffer-solution component
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 →Potassium chloride (CAS 7447-40-7), known in the fertilizer trade as muriate of potash (MOP), is a crystalline potassium salt. It is the most widely used potash fertilizer and also serves as a feedstock for other potassium chemicals, as a shale-stabilizing salt in oilfield drilling and completion fluids, and as a chemical reagent.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 231-211-8
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:
- Sodium Reduction & Salt Substitutes (Potassium Chloride) (Food & Beverage)
- Drilling Fluids & Mud Additives (Oil, Gas & Mining)
Frequently Asked Questions
What is potassium chloride (MOP) used for?
Potassium chloride (KCl, CAS 7447-40-7), known in the fertilizer trade as muriate of potash (MOP), is the most widely used potash fertilizer. It also serves as a feedstock for other potassium chemicals, as a shale-stabilizing salt in oilfield drilling and completion fluids, and as an industrial reagent and electrolyte.
What does MOP stand for?
MOP stands for muriate of potash, the fertilizer-trade name for potassium chloride (KCl). It is a crystalline potassium salt and the primary potassium source used in fertilizer blends.
What is the chemical formula for potassium chloride?
Potassium chloride is KCl (listed formula ClK), CAS 7447-40-7. As fertilizer-grade muriate of potash it classifies under HS 3104.20.
Why is potassium chloride used in oilfield drilling fluids?
The potassium ion in KCl stabilizes reactive clays and shales, reducing swelling and dispersion in the wellbore, which is why it is used as a shale-stabilizing salt in drilling and completion brines.
How is bulk potassium chloride packaged and quoted?
It is supplied in bags, supersacks, or bulk depending on grade. Submit a bulk RFQ with grade, quantity, and packaging for current pricing with CoA and SDS; we do not list fixed prices.
What is the REACH and TSCA regulatory status of Potassium Chloride (MOP, Muriate of Potash)?
Potassium Chloride (MOP, Muriate of Potash) (CAS 7447-40-7) 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 231-211-8).