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Chlorides and other halides

Potassium hexafluorosilicate

Also known as Potassium fluosilicate, Potassium silicofluoride, Dipotassium hexafluorosilicate

CAS 16871-90-2Formula F6K2SiMolar mass 220.27 g/molEC 240-896-2
GHS signal word: Danger. Pictograms: Acute toxicity (severe) 33 suppliers listed
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Potassium hexafluorosilicate chemical structure, F6K2Si, CAS 16871-90-2
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Powder
Density
Relative density (water = 1): 2.3
Solubility
Solubility in water, g/100ml at 20 °C: 0.18 (poor)
HS code
282690
Category
Chlorides and other halides
UN number
UN 2655
Illustrative photo, assorted laboratory chemical bottles and jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Potassium hexafluorosilicate?

Plain description, key identifiers and synonyms

Potassium fluorosilicate appears as a white, odorless crystalline powder. Denser than water. Contact may cause irritation to skin, eyes, and mucous membranes. May be toxic by ingestion. Used to make other chemicals.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dipotassium, hexafluorosilicon(2-)
CAS number
16871-90-2 CAS number cross-checked
EC number
240-896-2
Molecular formula
F6K2Si
UNII
2610W49XYD
MDL number
MFCD00040666
INCI name
POTASSIUM FLUOROSILICATE
InChIKey
UUHPPUWEDCVPCO-UHFFFAOYSA-N
InChI
InChI=1S/F6Si.2K/c1-7(2,3,4,5)6;;/q-2;2*+1
SMILES (canonical and isomeric)
F[Si-2](F)(F)(F)(F)F.[K+].[K+]

Synonyms

  • Potassium fluosilicate
  • Potassium silicofluoride
  • Dipotassium hexafluorosilicate
  • Dipotassium hexafluorosilicate(2-)
  • Silicate(2-), hexafluoro-, potassium (1:2)
  • Silicate, hexafluoro-, dipotassium
  • Fluosilicate de potassium
  • Dipotassium hexafluorosilicate(2)
  • Fluorosilicate de potassium
  • Silicofluorure de potassium
  • Silicate(2), hexafluoro, dipotassium
  • Silicate(2), hexafluoro, potassium (1:2)
  • Potassium fluorosilicate
  • dipotassium, hexafluorosilicon(2-)
  • Silicate(2-), hexafluoro-, dipotassium
  • dipotassium hexafluorosilanediuide
  • F6K2Si
  • K2SiF6
  • Dipotassium hexafluoridosilicate(2-)
  • Potassium hexafluorosilicate, >=99.0% (T)

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Physical form
Powderexp.
Density
Relative density (water = 1): 2.3exp.
Solubility
Solubility in water, g/100ml at 20 °C: 0.18 (poor)exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
220.27 g/molcalc.
Exact mass
219.8948 Dacalc.
LogP (octanol/water)
-3.85calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
9calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H301Toxic if swallowed.
  • H311Toxic in contact with skin.
  • H331Toxic if inhaled.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2655
Transport hazard class
6.1
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Potassium hexafluorosilicate suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 33 suppliers
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Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

33 suppliers in 7 countries

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Potassium hexafluorosilicate price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Industrial uses: Abrasives.

Use classes: Cosmetics.

Cosmetic ingredient, INCI name POTASSIUM FLUOROSILICATE(antiplaque, oral care)

Functional uses

  • Pharmaceutical

Cosmetic functions

  • Antiplaque
  • Oral care

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 009-012-00-0[2]

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex III, restricted in cosmetics
    Name: POTASSIUM FLUOROSILICATE, Ref no: 41, Annex ref: III/41

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Potassium hexafluorosilicate is traded under.

HS 2826.90Indicative HS code

Fluorides, fluorosilicates, fluoroaluminates and other complex fluorine salts, other

World exports in 2024
$465M
−20.9% vs 2023, imports $484M
2019 to 2024
Top exporters
  1. China52.6%
  2. Germany16.1%
  3. South Korea11.1%
Top importers
  1. Japan33.0%
  2. United States18.8%
  3. South Korea8.4%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Potassium hexafluorosilicate is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Potassium hexafluorosilicate, based on the data on this page

What is Potassium hexafluorosilicate?

Potassium fluorosilicate appears as a white, odorless crystalline powder. Denser than water. Contact may cause irritation to skin, eyes, and mucous membranes. May be toxic by ingestion. Used to make other chemicals.

What is the CAS number of Potassium hexafluorosilicate?

The CAS registry number of Potassium hexafluorosilicate is 16871-90-2.

What is the molecular formula and weight of Potassium hexafluorosilicate?

The molecular formula of Potassium hexafluorosilicate is F6K2Si and its molar mass is 220.27 g/mol.

What is Potassium hexafluorosilicate used for?

Industrial uses: Abrasives. Use classes: Cosmetics.

Is Potassium hexafluorosilicate hazardous?

Potassium hexafluorosilicate carries the GHS signal word "Danger". Main hazards: toxic if swallowed, toxic in contact with skin, toxic if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Potassium hexafluorosilicate?

Potassium hexafluorosilicate is usually classified under HS code 282690 (Fluorides, fluorosilicates, fluoroaluminates and other complex fluorine salts, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Potassium hexafluorosilicate?

CompoundList lists 33 suppliers of Potassium hexafluorosilicate in India, China, United States, Turkey and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Potassium hexafluorosilicate in India?

11 suppliers in India list Potassium hexafluorosilicate on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Potassium hexafluorosilicate?

Suppliers quote Potassium hexafluorosilicate on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Potassium hexafluorosilicate

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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