Ammonium fluorosilicate

CAS: 16919-19-0

Overview

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.

Physical Properties

Melting Point	°Cd ec.)
Density	2.011 g/cm³
Appearance	Ammonium hexafluorosilicate is a white crystalline powder. Odorless.
Color	White
Form	Crystalline Powder and Chunks
Water Solubility	Slightly soluble in water. Insoluble in alcohol and acetone.
Vapor Pressure	9.99Pa at 20℃
Log P	-6.01 at 20℃

Safety & Handling

Danger GHS06 GHS07 GHS08 Hazard Statements H301 Toxic if swallowed H311 Toxic in contact with skin H315 Causes skin irritation H319 Causes serious eye irritation H331 Toxic if inhaled H335 May cause respiratory irritation H372 Causes damage to organs through prolonged or repeated exposure H412 Harmful to aquatic life with long lasting effects H301+H311+H331 Toxic if swallowed, in contact with skin or if inhaled Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	2826908090
UN Number	2854
ADR Class	6.1
Packing Group	III
WGK (Germany)	2

Other Names

Industries

Water Treatment Building & Construction Textile, Leather & Paper Mining & Metals