Substance profile
Sodium Silicate
Sodium Silicate is colorless monoclinic crystals.
01 · Identification
What Sodium Silicate is
Sodium Silicate is colorless monoclinic crystals. Its molecular formula is Na2O3Si and its molecular weight is 122.063 g/mol. It boils at 100 °C, melts at 1089 °C.
Under the GHS it carries the signal word Danger.
02 · Identifiers
Sodium Silicate identifiers and molecular data
Sodium Silicate CAS number and EC number
Sodium Silicate molecular formula and molecular weight
Other names for Sodium Silicate
- disodium metasilicate
03 · GHS classification
Sodium Silicate hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Sodium Silicate pictograms and signal word
Sodium Silicate hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
| Specific target organ toxicity - single exposure GHS chapter 3.8 | Category 3 | H335 | GHS07 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Sodium Silicate hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H335 | May cause respiratory irritation. |
| H314 | Causes severe skin burns and eye damage. |
This page lists only the codes assigned to Sodium Silicate. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Sodium Silicate
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Sodium Silicate issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Sodium Silicate precautionary statements
CLP Annex VI assigns 5 precautionary statements to Sodium Silicate. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Sodium Silicate name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | динатриев метасиликат |
| Spanish español | Metasilicato de disodio |
| Czech čeština | metakřemičitan disodný |
| Danish dansk | dinatriummetasilicat |
| German Deutsch | Dinatriummetasilicat |
| Estonian eesti | dinaatriummetasilikaat |
| Greek ελληνικά | μεταπυριτικό δινάτριο |
| English English | disodium metasilicate |
| French français | métasilicate de disodium |
| Croatian hrvatski | dinatrijev metasilikat |
| Italian italiano | metasilicato di disodio |
| Latvian latviešu | dinātrija metasilikāts |
| Lithuanian lietuvių | dinatrio metasilikatas |
| Hungarian magyar | dinátrium-metaszilikát |
| Maltese Malti | metasilikat tad-disodju |
| Dutch Nederlands | dinatriummetasilicaat |
| Polish polski | metakrzemian disodu |
| Portuguese português | metassilicato de dissódio |
| Romanian română | metasilicat de disodiu |
| Slovak slovenčina | kremičitan disodný |
| Slovenian slovenščina | dinatrijev metasilikat |
| Finnish suomi | dinatriummetasilikaatti |
| Swedish svenska | dinatriummetasilikat |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Sodium Silicate GHS label elements
Everything CLP Annex VI fixes for Sodium Silicate, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Sodium Silicate
- May cause respiratory irritation.
- Causes severe skin burns and eye damage.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- Immediately call a POISON CENTER/doctor/…
- Do NOT induce vomiting.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Sodium Silicate in the GHS label constructor →
07 · Health hazards
Sodium Silicate health hazards and exposure limits
Sodium Silicate hazard summary
General term for a group of compounds with varying quantities of sodium oxide (Na2-O) and silica (Si2-O); Aqueous solutions are characterized by the weight ratio of silica to sodium oxide, usually 1.6 to 3.8; Solutions are strongly alkaline and corrosive; [Merck Index] A strong skin and eye irritant; Toxic by ingestion at high doses; [CAMEO] A medium strong base in solution; 25-50% Aqueous solution: Aerosol is a skin, eye, and respiratory tract irritant; [ICSC] Corrosive to rabbit skin (when tested at 53.5% molar ratio of 1.6 and 82% molar ratio of 2.4); Sodium metasilicate was not sensitizing in a local lymph node assay study of mice; Similar uses and adverse effects are expected from the hydrous and anhydrous forms (Sodium metasilicate pentahydrate, Sodium metasilicate nonahydrate, Sodium metasilicate, Sodium silicate, and Potassium silicate). The main hazard of soluble silicates is their alkalinity and potentially corrosive effects on metal and tissue. [Ullmann]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Sodium Silicate properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
Sodium Silicate boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 100 °C (212 °F) | NONAHYDRATE | HSDB |
| 102 °C (215.6 °F) | at 760 mmHg | DOE PAC |
Sodium Silicate melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 1089 °C (1992.2 °F) | HSDB | |
| 48 °C (118.4 °F) | HSDB |
Sodium Silicate density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 2.614 g/cm³ | HSDB | |
| 1.4 g/cm³ | ICSC | ||
| 1.4 g/cm³ | range, midpoint shown, at 20 °C | CAMEO |
Sodium Silicate solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | VERY SOL IN COLD & HOT WATER; SOLUBLE IN DILUTE SODIUM HYDROXIDE; INSOLUBLE IN ALCOHOL, ACIDS | NONAHYDRATE | HSDB |
| SOL IN WATER; INSOL IN ALCOHOL | HSDB | ||
| INSOL IN ACIDS, SALT SOLN | HSDB |
Sodium Silicate vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 18 mmHg | DOE PAC |
Sodium Silicate autoignition temperature
| Property | Value | Conditions | Source |
|---|---|---|---|
| Autoignition temperature | Not flammable (USCG, 1999) | CAMEO |
Sodium Silicate lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | Noncombustible | HSDB |
Sodium Silicate corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | Sodium metasilicate is considered to be too corrosive to be widely used in consumer product laundering formulations. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Sodium Silicate fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Sodium Silicate fire potential
Flammable solid. /Silicon powder, amorphous/
Source: Hazardous Substances Data Bank (HSDB)
10 · Handling and storage
Sodium Silicate storage and handling
Sodium Silicate safe storage
Separated from strong acids, aluminium and zinc.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Sodium Silicate incompatible materials
Sodium metasilicate ignites in fluorine.
Source: Hazardous Substances Data Bank (HSDB)
Sodium Silicate reactivity
SODIUM SILICATE contains a variable amount of water of hydration. Rate of dissolution depends on the degree of hydration, the amount of water that is used as solvent (less soluble in large amounts of water) and the temperature (higher temperature means quicker solution). Aqueous solutions react as bases. Reacts violently with fluorine [Lewis.]
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Sodium Silicate in the storage compatibility matrix →
11 · Questions
Sodium Silicate — frequently asked questions
What is the CAS number of Sodium Silicate?
The CAS number of Sodium Silicate is 6834-92-0. Its EC number is 229-912-9.
What is the chemical formula of Sodium Silicate?
The molecular formula of Sodium Silicate is Na2O3Si and its molecular weight is 122.063 g/mol.
What does a Sodium Silicate label have to show?
Under CLP Annex VI the label for Sodium Silicate carries the pictograms Corrosion and Exclamation mark and the signal word is Danger.
Is Sodium Silicate flammable?
CLP Annex VI assigns Sodium Silicate no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Sodium Silicate a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Sodium Silicate. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of Sodium Silicate?
The boiling point reported for Sodium Silicate is 100 °C (212 °F), NONAHYDRATE (HSDB).
What is the melting point of Sodium Silicate?
The melting point reported for Sodium Silicate is 1089 °C (1992.2 °F) (HSDB).
Nearby
Substances next to Sodium Silicate
Keep going: substances starting with S, or search the whole database by name, CAS number, pictogram or signal word.