CAS #:

Linear Formula:


MDL Number:


EC No.:



(2N) 99% Silicon Ethoxide
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(3N) 99.9% Silicon Ethoxide
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(4N) 99.99% Silicon Ethoxide
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(5N) 99.999% Silicon Ethoxide
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Silicon Ethoxide Properties (Theoretical)

Compound Formula C8H20O4Si
Molecular Weight 208.33
Appearance Colorless Liquid
Melting Point -77 °C
Boiling Point 168 °C
Density 0.94
Solubility in H2O N/A
Exact Mass N/A
Monoisotopic Mass 208.113083
Charge N/A

Silicon Ethoxide Health & Safety Information

Signal Word Warning
Hazard Statements H226-H319-H332-H335
Hazard Codes F, Xi
Precautionary Statements P210-P233-P240-P241-P242-P243-P261-P264-P271-P280-P303+P361+P353-P304+P340+P312-P305+P351+P338-P337+P313-P370+P378-P403+P233+P235-P405-P501
Risk Codes 10-20-36/37
Safety Statements N/A
RTECS Number VV9450000
Transport Information UN 1292 3/PG 3
WGK Germany 3
GHS Pictograms

View and Print SDS


Date Accessed: 05/21/2022
Date Revised: 05/15/2015


Product Name: Silicon Ethoxide

Product Number: All applicable American Elements product codes, e.g. SI-ETOX-02-LIQ , SI-ETOX-03-LIQ , SI-ETOX-04-LIQ , SI-ETOX-05-LIQ

CAS #: 78-10-4

Relevant identified uses of the substance: Scientific research and development

Supplier details:
American Elements
10884 Weyburn Ave.
Los Angeles, CA 90024
Tel: +1 310-208-0551
Fax: +1 310-208-0351

Emergency telephone number:
Domestic, North America: +1 800-424-9300
International: +1 703-527-3887


Classification of the substance or mixture
GHS Classification in accordance with 29 CFR 1910 (OSHA HCS)
Flammable liquids (Category 3), H226
Acute toxicity, Inhalation (Category 4), H332
Eye irritation (Category 2A), H319
Specific target organ toxicity - single exposure (Category 3), Respiratory system, H335

Flame - GHS02 Exclamation Mark - GHS07

Signal word: Warning
Hazard statement(s)
H226 Flammable liquid and vapor.
H319 Causes serious eye irritation.
H332 Harmful if inhaled.
H335 May cause respiratory irritation.
Precautionary statement(s)
P210 Keep away from heat/ sparks/ open flames/ hot surfaces. No smoking.
P233 Keep container tightly closed.
P240 Ground/bond container and receiving equipment.
P241 Use explosion-proof electrical/ ventilating/ lighting/ equipment.
P242 Use only non-sparking tools.
P243 Take precautionary measures against static discharge.
P261 Avoid breathing dust/ fume/ gas/ mist/ vapors/ spray.
P264 Wash skin thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/ eye protection/ face protection.
P303 + P361 + P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/ shower.
P304 + P340 + P312 IF INHALED: Remove person to fresh air and keep comfortable for breathing. Call a POISON CENTER/ doctor if you feel unwell.
P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P337 + P313 If eye irritation persists: Get medical advice/ attention.
P370 + P378 In case of fire: Use dry sand, dry chemical or alcohol-resistant foam to extinguish.
P403 + P233 Store in a well-ventilated place. Keep container tightly closed.
P403 + P235 Store in a well-ventilated place. Keep cool.
P405 Store locked up.
P501 Dispose of contents/ container to an approved waste disposal plant.
Hazards not otherwise classified (HNOC) or not covered by GHS - none


Synonyms : Tetraethoxysilane
Orthosilicic acid tetraethyl ester
Formula : C8H20O4Si
Molecular weight : 208.33 g/mol
CAS-No. : 78-10-4
EC-No. : 201-083-8


Description of first-aid measures
General advice
Show this material safety data sheet to the doctor in attendance.
If inhaled
After inhalation: fresh air.
In case of skin contact
In case of skin contact: Take off immediately all contaminated clothing. Rinse skin with
water/ shower.
In case of eye contact
After eye contact: rinse out with plenty of water. Call in ophthalmologist. Remove contact
If swallowed
After swallowing: immediately make victim drink water (two glasses at most). Consult a
Most important symptoms and effects, both acute and delayed
The most important known symptoms and effects are described in the labelling (see section
2.2) and/or in section 11
Indication of any immediate medical attention and special treatment needed
No data available


Extinguishing media
Suitable extinguishing media
Carbon dioxide (CO2) Foam Dry powder
Unsuitable extinguishing media
For this substance/mixture no limitations of extinguishing agents are given.
Special hazards arising from the substance or mixture
Carbon oxides
silicon oxides
Vapors are heavier than air and may spread along floors.
Forms explosive mixtures with air at elevated temperatures.
Development of hazardous combustion gases or vapours possible in the event of fire.
Advice for firefighters
In the event of fire, wear self-contained breathing apparatus.
Further information
Under fire conditions, material may decompose to form flammable and/or explosive
mixtures in air.Remove container from danger zone and cool with water. Suppress (knock down) gases/vapors/mists with a water spray jet. Prevent fire extinguishing water from contaminating surface water or the ground water system.


Personal precautions, protective equipment and emergency procedures
Advice for non-emergency personnel: Do not breathe vapors, aerosols. Avoid substance
contact. Ensure adequate ventilation. Keep away from heat and sources of ignition.
Evacuate the danger area, observe emergency procedures, consult an expert.
For personal protection see section 8.
Environmental precautions
Do not let product enter drains. Risk of explosion.
Methods and materials for containment and cleaning up
Cover drains. Collect, bind, and pump off spills. Observe possible material restrictions
(see sections 7 and 10). Take up with liquid-absorbent material (e.g. Chemizorb® ).
Dispose of properly. Clean up affected area.


Precautions for safe handling
Advice on safe handling
Work under hood. Do not inhale substance/mixture. Avoid generation of vapours/aerosols.
Advice on protection against fire and explosion
Keep away from open flames, hot surfaces and sources of ignition.Take precautionary
measures against static discharge.
Hygiene measures
Change contaminated clothing. Preventive skin protection recommended. Wash hands after
working with substance.
For precautions see section 2.2.
Conditions for safe storage, including any incompatibilities
Storage conditions
Store under nitrogen.
Keep container tightly closed in a dry and well-ventilated place. Keep away from heat and
sources of ignition.
Moisture sensitive.
Storage class (TRGS 510): 3: Flammable liquids
Specific end use(s)
Apart from the uses mentioned in section 1.2 no other specific uses are stipulated


Exposure controls
Appropriate engineering controls
Change contaminated clothing. Preventive skin protection recommended. Wash hands
after working with substance.
Personal protective equipment
Eye/face protection
Use equipment for eye protection tested and approved under appropriate
government standards such as NIOSH (US) or EN 166(EU). Safety glasses
Skin protection
This recommendation applies only to the product stated in the safety data sheet,
supplied by us and for the designated use. When dissolving in or mixing with other
substances and under conditions deviating from those stated in EN374 please
contact the supplier of CE-approved gloves.
Body Protection
Flame retardant antistatic protective clothing.
Respiratory protection
required when vapours/aerosols are generated.
Control of environmental exposure
Do not let product enter drains. Risk of explosion.


Appearance Form: liquid
Color: colorless
Odor No data available
Odor Threshold No data available
pH No data available
Melting point/freezing point
Melting point: -82.5 °C (-116.5 °F) at ca.1,013 hPa
Initial boiling point and boiling range168 °C 334 °F - lit.
Flash point 45 °C (113 °F) - closed cup - DIN 51755 Part 1
Evaporation rate No data available
Flammability (solid, gas) No data available
Upper/lower flammability or explosive limits
Upper explosion limit: 23 %(V)
Lower explosion limit: 1.3 %(V)
Vapor pressure < 1 hPa at 20 °C (68 °F)
Vapor density 7.19 - (Air = 1.0)
Relative density 0.933 g/cm³ at 20 °C (68 °F)
Water solubility 1.49 g/l at 23 °C (73 °F) at 7 hPa - soluble
Partition coefficient: n-octanol/water
log Pow: 3.18 at 40 °C (104 °F) - Bioaccumulation is not expected.
Autoignition temperature 222 °C (432 °F) at 960.8 hPa
Decomposition temperature No data available
Viscosity No data available
Explosive properties No data available
Oxidizing properties No data available


Vapor/air-mixtures are explosive at intense warming.
Chemical stability
The product is chemically stable under standard ambient conditions (room temperature) .
May decompose on exposure to moist air or water.
Possibility of hazardous reactions
No data available
Conditions to avoid
Incompatible materials
Strong oxidizing agents, Strong acids
Hazardous decomposition products
In the event of fire: see section 5


Acute toxicity
LD50 Oral - Rat - male and female - > 2,500 mg/kg
(OECD Test Guideline 423)
Symptoms: Irritations of mucous membranes in the mouth, pharynx, oesophagus and
gastrointestinal tract.
LD50 Oral - Rat - 6,270 mg/kg
LC50 Inhalation - Rat - male - 4 h - 10 mg/l
(OECD Test Guideline 403)
(Regulation (EC) No 1272/2008, Annex VI)
Symptoms: mucosal irritations, Cough, Shortness of breath, Inhalation may lead to the
formation of oedemas in the respiratory tract., Possible damages:, damage of respiratory
LD50 Dermal - Rabbit - 5,878 mg/kg
No data available
Skin corrosion/irritation
Skin - Rabbit
Result: No skin irritation - 4 h
(OECD Test Guideline 404)
Serious eye damage/eye irritation
Causes serious eye irritation. (Regulation (EC) No 1272/2008, Annex VI)
Respiratory or skin sensitization
Buehler Test - Guinea pig
Result: negative
(OECD Test Guideline 406)
Germ cell mutagenicity
Ames test
Salmonella typhimurium
Result: negative
IARC: No ingredient of this product present at levels greater than or equal to 0.1% is
identified as probable, possible or confirmed human carcinogen by IARC.
NTP: No ingredient of this product present at levels greater than or equal to 0.1% is
identified as a known or anticipated carcinogen by NTP.
OSHA: No component of this product present at levels greater than or equal to 0.1% is
on OSHA’s list of regulated carcinogens.
Reproductive toxicity
No data available
Specific target organ toxicity - single exposure
May cause respiratory irritation.
Classified according to Regulation (EU) 1272/2008, Annex VI (Table 3.1/3.2)
Acute oral toxicity - Irritations of mucous membranes in the mouth, pharynx, oesophagus
and gastrointestinal tract.
Acute inhalation toxicity - mucosal irritations, Cough, Shortness of breath, Inhalation may
lead to the formation of oedemas in the respiratory tract., Possible damages:, damage of
respiratory tract
Specific target organ toxicity - repeated exposure
No data available
Aspiration hazard
No data available
Repeated dose toxicity - Rat - male and female - Gavage - NOAEL (No observed adverse
effect level) - 10 - 50 mg/kg
RTECS: VV9450000
To the best of our knowledge, the chemical, physical, and toxicological properties have not
been thoroughly investigated.
Systemic effects:
After uptake of large quantities:
Damage to:
Other dangerous properties can not be excluded.
Handle in accordance with good industrial hygiene and safety practice.
Liver - Irregularities - Based on Human Evidence
Liver - Irregularities - Based on Human Evidence


Toxicity to fish semi-static test LC50 - Danio rerio (zebra fish) - > 245 mg/l - 96 h
(Regulation (EC) No. 440/2008, Annex, C.1)
Toxicity to daphnia
and other aquatic
flow-through test EC50 - Daphnia magna (Water flea) - > 75 mg/l -
48 h
(OECD Test Guideline 202)
Toxicity to algae static test ErC50 - Pseudokirchneriella subcapitata - > 100 mg/l - 72h
(OECD Test Guideline 201)
Toxicity to bacteria static test EC50 - activated sludge - > 100 mg/l - 3 h
(OECD Test Guideline 209)
Persistence and degradability
Biodegradability aerobic - Exposure time 28 d
Result: 98 % - Readily biodegradable.
(Directive 67/548/EEC Annex V, C.4.A.)
Bioaccumulative potential
No data available
Mobility in soil
No data available
Results of PBT and vPvB assessment
PBT/vPvB assessment not available as chemical safety assessment not required/not
Other adverse effects
No data available


Waste treatment methods
Waste material must be disposed of in accordance with the national and loc No mixing
with other waste. Handle uncleaned containers like the product See for processes regarding the return of chemicals and containers, or
contact us there if you have further questions.


UN number: 1292 Class: 3 Packing group: III
Proper shipping name: Tetraethyl silicate
Reportable Quantity (RQ):
Poison Inhalation Hazard: No
UN number: 1292 Class: 3 Packing group: III EMS-No: F-E, S-D
Proper shipping name: TETRAETHYL SILICATE
Marine pollutant : yes
UN number: 1292 Class: 3 Packing group: III
Proper shipping name: Tetraethyl silicate


SARA 302 Components
This material does not contain any components with a section 302 EHS TPQ.
SARA 313 Components
This material does not contain any chemical components with known CAS numbers that
exceed the threshold (De Minimis) reporting levels established by SARA Title III, Section 313.
SARA 311/312 Hazards
Fire Hazard, Acute Health Hazard, Chronic Health Hazard
Massachusetts Right To Know Components
No components are subject to the Massachusetts Right to Know Act


Safety Data Sheet according to Regulation (EC) No. 1907/2006 (REACH). The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. American Elements shall not be held liable for any damage resulting from handling or from contact with the above product. See reverse side of invoice or packing slip for additional terms and conditions of sale. COPYRIGHT 1997-2022 AMERICAN ELEMENTS. LICENSED GRANTED TO MAKE UNLIMITED PAPER COPIES FOR INTERNAL USE ONLY.

About Silicon Ethoxide

Silicon Ethoxide is generally immediately available in most volumes. High purity, submicron and nanopowder forms may be considered. American Elements produces to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia) and follows applicable ASTM testing standards. Typical and custom packaging is available. Additional technical, research and safety (MSDS) information is available as is a Reference Calculator for converting relevant units of measurement.

Silicon Ethoxide Synonyms

Orthosilicic acid tetraethyl ester, Silicon tetraethoxide, TEOS, Tetraethoxysilane, Tetraethoxysilicon(IV), Tetraethyl silicate

Chemical Identifiers

Linear Formula Si(C2H5O)4
MDL Number MFCD00009062
EC No. 201-083-8
Beilstein/Reaxys No. 1422225
Pubchem CID 6517
IUPAC Name tetraethylsilicate
InchI Identifier InChI=1S/C8H20O4Si/c1-5-9-13(10-6-2,11-7-3)12-8-4/h5-8H2,1-4H3

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Silicon products. Silicon (atomic symbol: Si, atomic number: 14) is a Block P, Group 14, Period 3 element with an atomic weight of 28.085. Silicon Bohr MoleculeThe number of electrons in each of Silicon's shells is 2, 8, 4 and its electron configuration is [Ne] 3s2 3p2. The silicon atom has a radius of 111 pm and a Van der Waals radius of 210 pm. Silicon was discovered and first isolated by Jöns Jacob Berzelius in 1823. Silicon makes up 25.7% of the earth's crust, by weight, and is the second most abundant element, exceeded only by oxygen. The metalloid is rarely found in pure crystal form and is usually produced from the iron-silicon alloy ferrosilicon. Elemental SiliconSilica (or silicon dioxide), as sand, is a principal ingredient of glass, one of the most inexpensive of materials with excellent mechanical, optical, thermal, and electrical properties. Ultra high purity silicon can be doped with boron, gallium, phosphorus, or arsenic to produce silicon for use in transistors, solar cells, rectifiers, and other solid-state devices which are used extensively in the electronics industry.The name Silicon originates from the Latin word silex which means flint or hard stone.


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