Silicones & Silicates
REACH
Potassium fluorosilicate
CAS Number
16871-90-2
EC Number
240-896-2
What is Potassium fluorosilicate?
Potassium fluorosilicate (CAS 16871-90-2), also known as potassium hexafluorosilicate and potassium silicofluoride, is an inorganic salt used in industrial processing and surface treatment.
Where is Potassium fluorosilicate used?
- Building and construction: hardening and densifying agent in concrete treatments, reacting with calcium compounds to improve surface durability
- Agriculture: active component in pesticide and soil treatment products, targeting specific pests or pathogens
- Textile and paper processing: flame-retardant additive and surface treatment agent
- Ceramics and glass manufacturing: flux and opacifier that lowers firing temperatures and improves surface finish
- It functions as a curing agent, flux, and biocidal component where controlled fluoride release and silicate reactivity are required.
Commercial specifications
- Technical grade, purity typically 98% or higher
- Packaging in bulk bags and smaller industrial units
Other Names (Synonyms)
Potassium hexafluorosilicate|Potassium fluosilicate|Potassium silicofluoride|Dipotassium hexafluorosilicate|2610W49XYD|Dipotassium hexafluorosilicate(2-)|Silicate(2-), hexafluoro-, potassium (1:2)
What are the physical properties of Potassium fluorosilicate?
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
How is Potassium fluorosilicate classified and handled safely? Learn More
Danger
GHS06· Toxic GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H301 Toxic if swallowed
H311 Toxic in contact with skin
H316 Causes mild skin irritation
H319 Causes serious eye irritation
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.
Which trade and regulatory codes apply to Potassium fluorosilicate?
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