Potassium fluorosilicate

CAS: 16871-90-2

Overview

Potassium fluorosilicate (CAS 16871-90-2 ), also known as potassium hexafluorosilicate and potassium silicofluoride, is an inorganic salt used across industrial processing and surface treatment applications.

It functions primarily as a curing agent, flux, and biocidal component in formulations where controlled fluoride release and silicate reactivity are required for specific chemical processes.

In building and construction, it acts as a hardening and densifying agent in concrete treatments, reacting with calcium compounds to improve surface durability and overall structural integrity.

Agricultural formulations use it as an active component in pesticide and soil treatment products, where controlled fluoride activity targets specific pest or pathogen profiles effectively.

Textile and paper processing operations apply it as a flame-retardant additive and surface treatment agent to improve substrate resistance against environmental factors and heat exposure.

In ceramics and glass manufacturing, it functions as a flux and opacifier, lowering firing temperatures and improving surface finish in finished products across various industrial lines.

Potassium fluorosilicate is supplied as a white crystalline powder. Technical grade is the standard commercial form, with purity levels typically specified at 98% or higher for use.

Packaging is available in bulk bags and smaller industrial units to suit both large-scale manufacturing and specialized formulation use within the global chemical supply chain.

Physical Properties

Melting Point	°Cd ec.)
Boiling Point	dec
Density	2.3 g/cm³
Appearance	White, odorless, crystalline powder. D 3.0. Slightly soluble in water; soluble in hydrochlo- ric acid.
Color	White
Odor	Odorless
Form	Powder
Water Solubility	Slightly soluble in water.
Vapor Pressure	0.01Pa
Refractive Index	1.3991
Log P	0.001

Safety & Handling

Danger GHS06 GHS07 GHS08 Hazard Statements H301 Toxic if swallowed H311 Toxic in contact with skin H316 Causes mild skin irritation H319 Causes serious eye irritation H320 Causes eye irritation H331 Toxic if inhaled H335 May cause respiratory irritation H372 Causes damage to organs through prolonged or repeated exposure 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. 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. 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	2655
ADR Class	6.1
Packing Group	III
Storage Class	6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects
WGK (Germany)	2

Other Names

Industries

Agriculture & Feed Water Treatment Textile, Leather & Paper Building & Construction