Potassium hexafluorosilicate

Potassium hexafluorosilicate (CAS 16871-90-2, EC 240-896-2), also known as potassium fluosilicate and potassium silicofluoride, is an inorganic fluorine-silicon salt supplied as a white crystalline powder. It carries no E-code designation and is classified under HS code 2826908090.

In building and construction, it functions as a cross-linking agent in cement and concrete treatments, where fluorosilicate ions react with calcium hydroxide to densify the matrix and improve surface hardness. In water treatment and textile processing, it acts as a biocide and preservative, releasing fluoride ions under controlled conditions to inhibit microbial growth.

Potassium hexafluorosilicate is available in technical and industrial grades as a dry crystalline powder. The substance is registered under REACH and must be handled in accordance with applicable EU chemical regulations. Standard packaging formats for B2B supply include 25 kg bags, with bulk options available on request.