Ammonium fluorosilicate

Ammonium fluorosilicate (CAS 16919-19-0, EC 240-968-3), also known as ammonium fluosilicate or diammonium fluosilicate, is an inorganic fluorine-containing salt supplied as a white crystalline powder. It carries no assigned E-code and is identified under HS code 2826908090 for customs classification purposes.

In mining and metals processing, ammonium fluorosilicate acts as a flux and surface-active agent, attacking oxide layers on metal surfaces to improve adhesion and coating uniformity. In water treatment and building materials, it functions as a corrosion inhibitor and concrete hardener by reacting with calcium compounds to form insoluble fluorosilicate complexes that densify porous substrates.

The product is available in technical grade as crystalline powder or chunks and is subject to REACH registration requirements within the European Economic Area. Procurement teams should request a current Safety Data Sheet and confirm supplier registration status prior to sourcing. Standard packaging formats vary by supplier volume and hazard classification.