Ammonium fluorosilicate

Ammonium fluorosilicate (CAS 16919-19-0), also sold as ammonium silicofluoride and ammonium hexafluorosilicate, is an inorganic fluorine salt used industrially for surface modification and hardening. Its dual fluoride and silicate activity makes it effective where both surface chemistry and corrosion resistance are required simultaneously across multiple manufacturing sectors and industrial processes.

In building and construction, it functions as a concrete hardener and densifier, reacting with surface substrates to improve wear resistance and reduce porosity in industrial flooring and masonry treatments. Textile and leather processors use it as a fixing and surface-treatment agent, improving fiber or hide resistance to degradation during finishing operations for high-quality material production.

In mining and metallurgy, it serves in ore flotation processes and metal surface treatments where controlled fluoride release is critical to process efficiency and chemical stability. Water treatment applications utilize it as a fluoridation source, and it also appears in wood preservation formulations targeting fungal and insect resistance for long-term protection.

Ammonium fluorosilicate is supplied as a white crystalline powder or granules. Technical grade is the standard commercial form, with purity levels typically ranging from 98% to 99%+ on a dry basis. Bulk quantities are available in bags or supersacks, with smaller packaged quantities offered for laboratory and specialty formulation use to meet diverse industrial and research requirements.