Tetramethyl Orthosilicate 681-84-5
6 Inquiries
681-84-5
Industrial Grade
99%
shanghai
Chemfine
200kg
2026-04-30
Organic Intermediate
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Product Description
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Seller Information
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Inquiry History
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DescriptionBasic Info
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Product Name:
Tetramethoxysilane
Other Name:Silicic acid (H4SiO4),tetramethyl ester;Methyl silicate ((MeO)4Si);Tetramethoxysilane;Silane,tetramethoxy-;Tetramethyl silicate;Tetramethyl orthosilicate;Methyl orthosilicate;Methyl silicate ((CH3)4SiO4);Methyl silicate;Silicon tetramethoxide;Silicon methoxide (Si(OMe)4);TMOS;KBM 04;Methyl Silicate 39;Methyl Silicate 28;T 1980;LS 540;SIT 7510.0;TSL 8114;Siluplex;Dynasil M;NSC 67383;OCD-T 2;MZ 51;MKC Silicate MS 39;Methyl Silicate 40;Methyl Silicate 51L;WD 931;TO 588;NIC-C 5;12547-31-8
CAS No.:681-84-5
Molecular Formula:C4H12O4Si
InChIKeys:InChIKey=LFQCEHFDDXELDD-UHFFFAOYSA-N
Molecular Weight:152.22100
Exact Mass:152.22
EC Number:211-656-4
UNII:19D35VPL66
ICSC Number:1188
NSC Number:67383
UN Number:2606
DSSTox ID:DTXSID3027291
Color/Form:Colorless liquid|Clear, colorless liquid [Note: A solid below 28 degrees F].
HScode:29209085
Categories:
Characteristics-
PSA:
36.92000
XLogP3:0.00760
Appearance:colourless liquid
Density:1.032 g/cm3 @ Temp: 20 °C
Melting Point:-2 °C
Boiling Point:121-122 °C @ Press: 760 Torr
Flash Point:26ºC
Refractive Index:1.367-1.37
Water Solubility:hydrolysis
Storage Conditions:Flammables area
Vapor Pressure:3.35 psi ( 20 °C)
Vapor Density:5.25 (vs air)
Flammability characteristics:Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Explosive limit:During the preparation of the hexamethoxides of rhenium, molybdenum and tungstenby co-condensation with excess /tetramethyl silicate/ on a cold surface, simultaneous co-condensation is necessary to avoid the danger of explosion present when sequential condensation of the reactants is employed. In the latter case, the high concentrations of hexafluoride at the interface leads to violent reaction with silane.
Henrys Law Constant:Henry's Law constant = 6.4X10-6 atm-cu m/mol at 25 °C (est)
Experimental Properties:Hydrolyzes in water after 2 days|Hydroxyl radical reaction rate constant = 3.3X10-12 cu cm/molecule-sec at 25 °C (est)
Air and Water Reactions:Flammable. Insoluble in water.
Reactive Group:Siloxanes
Reactivity Alerts:Highly Flammable
Reactivity Profile:METHYL ORTHOSILICATE is incompatible with the following: Oxidizers; hexafluorides of rhenium, molybdenum & tungsten (NIOSH, 2016).
Flammable Limits:Class IIIB Combustible Liquid: Fl.P. at or above 200°F.
Heat of Vaporization:46.5 kJ/mol
Hazard IdentificationClassification of the substance or mixture
Flammable liquids, Category 3
Skin irritation, Category 2
Serious eye damage, Category 1
Acute toxicity - Category 1, Inhalation
GHS label elements, including precautionary statements
Pictogram(s) 
Signal word Danger
Hazard statement(s) H226 Flammable liquid and vapour
H315 Causes skin irritation
H318 Causes serious eye damage
H330 Fatal if inhaled
Precautionary statement(s) Prevention P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233 Keep container tightly closed.
P240 Ground and bond container and receiving equipment.
P241 Use explosion-proof [electrical/ventilating/lighting/...] equipment.
P242 Use non-sparking tools.
P243 Take action to prevent static discharges.
P280 Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/...
P264 Wash ... thoroughly after handling.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P271 Use only outdoors or in a well-ventilated area.
P284 [In case of inadequate ventilation] wear respiratory protection.
Response P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse affected areas with water [or shower].
P370+P378 In case of fire: Use ... to extinguish.
P302+P352 IF ON SKIN: Wash with plenty of water/...
P321 Specific treatment (see ... on this label).
P332+P317 If skin irritation occurs: Get medical help.
P362+P364 Take off contaminated clothing and wash it before reuse.
P305+P354+P338 IF IN EYES: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P317 Get medical help.
P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P316 Get emergency medical help immediately.
P320 Specific treatment is urgent (see ... on this label).
Storage P403+P235 Store in a well-ventilated place. Keep cool.
P403+P233 Store in a well-ventilated place. Keep container tightly closed.
Disposal P501 Dispose of contents/container to an appropriate treatment and disposal facility in accordance with applicable laws and regulations, and product characteristics at time of disposal.
Other hazards which do not result in classification
no data available
Handling and StoragePrecautions for safe handling
NO open flames, NO sparks and NO smoking. Above 20°C use a closed system, ventilation and explosion-proof electrical equipment. Handling in a well ventilated place. Wear suitable protective clothing. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Use non-sparking tools. Prevent fire caused by electrostatic discharge steam.
Conditions for safe storage, including any incompatibilities
Fireproof. Separated from food and feedstuffs.
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Seller Information
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Business Type:
Trader
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Main Products:
Organic Intermediate
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Location:
Room 1001, No. 3 Building, Jiaye International City, Jinrong 3 Street
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Payment Terms:
D/P,L/C,D/A,TT against B/L draft before shipment
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Average lead Time:
14
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Total Annual Revenue:
$50 million-$100 million
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Total Employees:
11-50
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Year of Establishment:
2003
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Inquiry History6 Inquiries
Country Product Purchase Quantity Date Posted 
France
Tmos CAS 681-84-5
20 TON Jan 18, 2024 
India
Tetramethyl orthosilicate
100 G Jan 29, 2026
India
Tetra Methyl Ortho Silicate
500 KG Nov 20, 2025 
Russia
Tetramethyl orthosilicate
4 MT Jan 15, 2026 
United States
Tetramethyl Orthosilicate
10 MT Mar 12, 2025
France
Tetramethyl orthosilicate
200 KG Jan 10, 2024 Post an enquiry for this product
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