Sodium fluorosilicate

Sodium fluorosilicate (CAS 16893-85-9), also known as sodium hexafluorosilicate or sodium fluosilicate, is an inorganic fluoride salt used industrially as a biocide, curing agent, and surface-hardening additive.

Where is Sodium fluorosilicate used?

• Building and construction: concrete densifier and hardener reacting with surface calcium compounds to improve wear resistance in industrial flooring and cement-based coatings
• Water treatment: fluoridation source for municipal supplies
• Textile and leather: preservative and mothproofing agent protecting finished goods during storage and transit
• Agriculture: active ingredient in pesticide formulations targeting wood-boring insects and soil pests
• It delivers fluoride activity in controlled-release form.

Good to know: Water treatment applications may require grades meeting specific national or regional drinking water standards.

Commercial specifications

• Purity typically 98–99%