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Silicates, borates and other salts

Sodium silicate

Also known as Waterglass, Sodium siliconate, Sodium sesquisilicate

CAS 1344-09-8Formula Na2O3SiMolar mass 122.06 g/molEC 215-687-4
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant 316 suppliers listed
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Sodium silicate chemical structure, Na2O3Si, CAS 1344-09-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless monoclinic crystals
Melting point
1,089 °C
Boiling point
100 °C
Density
Relative density (water = 1): 1.4
Solubility
VERY SOL IN COLD & HOT WATER, SOLUBLE IN DILUTE SODIUM HYDROXIDE, INSOLUBLE IN ALCOHOL,…
HS code
283911
Category
Silicates, borates and other salts
UN number
UN 1759
Illustrative photo, colourless crystals beside an amber glass bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Sodium silicate?

Plain description, key identifiers and synonyms

Sodium silicate is an inorganic sodium salt having silicate as the counterion. It contains a silicate ion.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
disodium, dioxido(oxo)silane
CAS number
1344-09-8 CAS number cross-checkedOther or deprecated CAS: 6834-92-0, 84992-49-4
EC numbers
215-687-4, 229-912-9
Molecular formula
Na2O3Si
UNII
052612U92L
MDL number
MFCD00003492
INCI name
SODIUM METASILICATE, SODIUM SILICATE
InChIKey
NTHWMYGWWRZVTN-UHFFFAOYSA-N
InChI
InChI=1S/2Na.O3Si/c;;1-4(2)3/q2*+1;-2
SMILES (canonical and isomeric)
[O-][Si](=O)[O-].[Na+].[Na+]

Synonyms

  • Waterglass
  • Sodium siliconate
  • Sodium sesquisilicate
  • Sodium silicate glass
  • Sodium water glass
  • Britesil
  • Carsil
  • Dryseq
  • Sikalon
  • Silican
  • Soluble glass
  • Silicic acid, sodium salt
  • Agrosil S
  • Agrosil LR
  • Portil A
  • Silica E
  • Silica K
  • Silica N
  • Silica R
  • Pyramid 1
  • Pyramid 8
  • Carsil (silicate)
  • Britesil H 20
  • Britesil H 24
  • Dupont 26
Show all 38 synonyms
  • Metso 99
  • as Bond 1001
  • L 96 (salt)
  • DP 222
  • Sodium silicon oxide (na2sio3)
  • Silicon sodium oxide
  • Sodium beta-silicate
  • HK 30
  • SP 33
  • Star
  • Sodium metasilicate
  • Disodium metasilicate
  • Water glass

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 monoclinic crystalsexp.
Melting point
1,089 °Cexp.
Boiling point
100 °Cexp.
Density
Relative density (water = 1): 1.4exp.
Autoignition temperature
Not flammableexp.
Solubility
VERY SOL IN COLD & HOT WATER, SOLUBLE IN DILUTE SODIUM HYDROXIDE, INSOLUBLE IN ALCOHOL, ACIDS /NONAHYDRATE/exp.
Vapour pressure
18 [mm Hg]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
122.06 g/molcalc.
Exact mass
121.9412 Dacalc.
LogP (octanol/water)
-8.87calc.
Topological polar surface area
63.19 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
6calc.
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
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.
UN number
UN 1759

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

Sodium silicate suppliers

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All 316 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

316 suppliers in 51 countries

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Sodium silicate 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

In fireproofing mixtures, boiler cmpd.

In laundry, dairy & metal-cleaning, floor cleaning, deinking paper.

Chemical intermediate for silica gel catalysts, additive in soaps and synthetic detergents, ingredient in adhesives, bleaching aid.

Sodium metasilicate with other salts, eg, sodium phosphates and sodium bicarbonate, can be used on aluminum as a paint stripper.

Lining bessemer converters, acid concentraters, manufacture grindstones, abrasive wheels (as binder only).

Industrial uses: Binder, Other, Lubricating agent, Anti-caking agent, Chemical reaction regulator, Plating agent, pH regulating agent, Bleaching agent.

Consumer uses: Bleaching agent, pH regulating agent, Surfactant (surface active agent), Other, Binder, Adsorbent, Processing aids, specific to petroleum production, Chelating agent.

Use classes: Processing Aids and Additives, Safer Chemical Classes, Cosmetics, Plastics.

Cosmetic ingredient, INCI name SODIUM SILICATE(anticorrosive, buffering)

Functional uses

  • Anti-redeposition agent
  • Binder
  • Chelating agent
  • Cleaning agent
  • Corrosion inhibitor
  • Filler
  • Hardener
  • Processing aids not otherwise specified
  • Sealant (barrier)
  • Surface modifier
  • Surfactant (surface active agent)
  • pH regulating agent

Cosmetic functions

  • Anticorrosive
  • Buffering
  • Chelating

How it is made

Fusion of sodium carbonate with silicon dioxide or silica sand

Fusing of silica sand with soda ash in an open hearth furnace (for sodium siliconate, the mole weight ratio of silica sand to soda ash equals 0.67, for commercial sodium silicates,the mole weight ratio varies from 0.5 to 3.75)

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 014-010-00-8

Health and food

  • EU cosmetic ingredient inventory

United States

  • Safer Choice ingredient list (USA)
  • 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 Sodium silicate is traded under.

HS 2839.11Indicative HS code

Sodium metasilicates

World exports in 2024
$63.2M
+10.7% vs 2023, imports $72.4M
2019 to 2024
Top exporters
  1. China45.3%
  2. Belgium23.8%
  3. Netherlands8.5%
Top importers
  1. Japan14.8%
  2. Germany12.4%
  3. United States10.3%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Sodium silicate, based on the data on this page

What is Sodium silicate?

Sodium silicate is an inorganic sodium salt having silicate as the counterion. It contains a silicate ion.

What is the CAS number of Sodium silicate?

The CAS registry number of Sodium silicate is 1344-09-8. Other or deprecated CAS numbers: 6834-92-0, 84992-49-4.

What is the molecular formula and weight of Sodium silicate?

The molecular formula of Sodium silicate is Na2O3Si and its molar mass is 122.06 g/mol.

What is Sodium silicate used for?

In fireproofing mixtures, boiler cmpd. In laundry, dairy & metal-cleaning, floor cleaning, deinking paper. Chemical intermediate for silica gel catalysts, additive in soaps and synthetic detergents, ingredient in adhesives, bleaching aid.

Is Sodium silicate hazardous?

Sodium silicate 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 Sodium silicate?

Sodium silicate is usually classified under HS code 283911 (Sodium metasilicates). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Sodium silicate?

CompoundList lists 316 suppliers of Sodium silicate in India, United States, China, South Korea and 47 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Sodium silicate in India?

78 suppliers in India list Sodium silicate on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Sodium silicate?

Suppliers quote Sodium silicate 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 Sodium silicate

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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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