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Silicates, borates and other salts

Potassium polysilicate

Also known as Potassium water glass, Kasil, Kasil 6

CAS 14293-88-0Formula K4O4SiMolar mass 248.47 g/molEC 215-199-1
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant
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Potassium polysilicate chemical structure, K4O4Si, CAS 14293-88-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
14293-88-0
Formula
K4O4Si
Appearance
Colorless or yellowish, translucent, glass-like pieces
Solubility
SOL IN COLD & HOT WATER, INSOL ALC /META & TETRASILICATE/
HS code
283990
Category
Silicates, borates and other salts
Illustrative photo, colourless crystals in small glass vials on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Potassium polysilicate?

Plain description, key identifiers and synonyms

Potassium polysilicate is a chemical substance with the molecular formula K4O4Si and a molar mass of 248.47 g/mol. Its CAS registry number is 14293-88-0. The IUPAC name is tetrapotassium, silicate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
tetrapotassium, silicate
CAS number
14293-88-0
EC numbers
215-199-1, 815-247-7
Molecular formula
K4O4Si
UNII
55R0S6LC84
INCI name
POTASSIUM SILICATE
InChIKey
RLQWHDODQVOVKU-UHFFFAOYSA-N
InChI
InChI=1S/4K.O4Si/c;;;;1-5(2,3)4/q4*+1;-4
SMILES (canonical and isomeric)
[O-][Si]([O-])([O-])[O-].[K+].[K+].[K+].[K+]

Synonyms

  • Potassium water glass
  • Kasil
  • Kasil 6
  • Pyramid 120
  • potassium orthosilicate
  • tetrapotassium, silicate
  • Pyramid K-84
  • Potassium silicate (K4SiO4)
  • potassium hydroxy(oxo)silanolate
  • Silicic acid (H4SiO4), tetrapotassium salt
  • Aqueous potassium silicate

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

Appearance
Colorless or yellowish, translucent, glass-like piecesexp.
Solubility
SOL IN COLD & HOT WATER, INSOL ALC /META & TETRASILICATE/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
248.47 g/molcalc.
Exact mass
247.8114 Dacalc.
LogP (octanol/water)
-17.12calc.
Topological polar surface area
92.24 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
9calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
5calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H314Causes severe skin burns and eye damage.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing 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.

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 polysilicate suppliers

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Potassium polysilicate 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

As binder (eg, in carbon electrodes, lead pencils, protective coatings, insol pigments), detergent.

In glass & ceramics manufacture.

(Solid) manufacture of welding rods, potassium silicate solution, (solution) nonefflorescing base for inorg protective coatings, coating for roofing granules & welding rods, (solution) binder in phosphors on television tubes, catalyst, adhesives.

Detergents, deflocculating agents, adhesives, cements, films & coatings, sols & gels, & paints. (Kasil).

Cosmetic ingredient, INCI name POTASSIUM SILICATE(anticorrosive)

Functional uses

  • Binder
  • Chelating agent
  • Corrosion inhibitor
  • Filler
  • Processing aids not otherwise specified

Cosmetic functions

  • Anticorrosive

How it is made

Supercooled melt of potassium carbonate & pure silica sand.

Potassium silicates are manufactured in ordinary glass furnaces by melting sand with.../potash/ at about 1450 °c. The ratio of glass, or the aq liq, is determined by the prop of sand & alkali added to the furnace.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2839.90Indicative HS code

Silicates, commercial alkali metal silicates, other

World exports in 2024
$241M
−2.7% vs 2023, imports $307M
2019 to 2024
Top exporters
  1. China20.4%
  2. United States17.9%
  3. Netherlands11.7%
Top importers
  1. Saudi Arabia13.5%
  2. Germany8.3%
  3. United States7.3%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Potassium polysilicate?

Potassium polysilicate is a chemical substance with the molecular formula K4O4Si and a molar mass of 248.47 g/mol. Its CAS registry number is 14293-88-0. The IUPAC name is tetrapotassium, silicate.

What is the CAS number of Potassium polysilicate?

The CAS registry number of Potassium polysilicate is 14293-88-0.

What is the molecular formula and weight of Potassium polysilicate?

The molecular formula of Potassium polysilicate is K4O4Si and its molar mass is 248.47 g/mol.

What is Potassium polysilicate used for?

As binder (eg, in carbon electrodes, lead pencils, protective coatings, insol pigments), detergent. In glass & ceramics manufacture.

Is Potassium polysilicate hazardous?

Potassium polysilicate carries the GHS signal word "Danger". Main hazards: causes severe skin burns and eye damage, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Potassium polysilicate?

Potassium polysilicate is usually classified under HS code 283990 (Silicates, commercial alkali metal silicates, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Potassium polysilicate?

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What is the price of Potassium polysilicate?

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Guides for buyers

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

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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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