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 →Fluorosilicic acid (hydrofluorosilicic acid, FSA, CAS 16961-83-4, H2SiF6) is the most widely used chemical for municipal drinking-water fluoridation in the United States. Supplied as a ~23–25% aqueous solution, it provides a controlled fluoride dose to help prevent tooth decay.
Fluorosilicic Acid: Use & Grade
Water utilities meter fluorosilicic acid into finished water to maintain the optimal fluoride level. It is a corrosive, strongly acidic liquid that releases hydrogen fluoride and silica on reaction — it must be stored and fed with fluoride/HF-rated materials, containment, and PPE per the SDS. Fluoridation-grade product meets AWWA B703 and is certified to NSF/ANSI/CAN 60.
Grade & Specification
⚠ Corrosive and toxic — not a consumer product; for trained water-treatment operators only. Send your system and volume on an RFQ; we confirm NSF-60 certification and provide the CoA + SDS.
Frequently Asked Questions
What is fluorosilicic acid used for?
Fluorosilicic acid is the primary chemical for municipal drinking-water fluoridation in the U.S. Utilities meter the ~23–25% solution into finished water to maintain the optimal fluoride concentration. RawSource supplies AWWA B703 / NSF-60 fluoridation grade to spec.
Is fluorosilicic acid the same as hydrofluorosilicic acid?
Yes — fluorosilicic acid, hydrofluorosilicic acid, hexafluorosilicic acid, and FSA all refer to H2SiF6 (CAS 16961-83-4). Water-fluoridation product is typically a 23–25% aqueous solution.
Is fluorosilicic acid hazardous to handle?
Yes. It is a corrosive, strongly acidic liquid that releases hydrogen fluoride; it attacks glass, concrete, and many metals and is toxic on contact or inhalation. Store and feed with fluoride/HF-rated materials, secondary containment, and full PPE per the SDS. It is for trained water-treatment operators, not general use.
How is fluorosilicic acid supplied in bulk?
RawSource supplies fluoridation-grade fluorosilicic acid (23–25%) in bulk and totes under CAS 16961-83-4 / HS 2811.19, with NSF-60 certification, CoA, and SDS at quotation. Submit a bulk RFQ with your volume and delivery point.