Tetraethyl orthosilicate(CAS#78-10-4)
| Hazard Symbols | Xn - Harmful |
| Risk Codes | R10 - Flammable R20 - Harmful by inhalation R36/37 - Irritating to eyes and respiratory system. R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S16 - Keep away from sources of ignition. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | UN 1292 3/PG 3 |
| WGK Germany | 1 |
| RTECS | VV9450000 |
| TSCA | Yes |
| HS Code | 2920 90 70 |
| Hazard Class | 3 |
| Packing Group | III |
| Toxicity | LD50 orally in Rabbit: 6270 mg/kg LD50 dermal Rabbit 5860 mg/kg |
Introduction
Ethyl silicate is also known as tetraethyl silicate and tetraethoxysilane. Colorless transparent liquid with special odor. It is stable in the presence of no water, decomposes into ethanol and silicic acid in water, becomes turbid in humid air, and is soluble in organic solvents such as alcohol and ether. Toxic, strong irritation to human eyes and respiratory tract. It is prepared by distillation after the action of silicon tetrachloride and absolute ethanol. It is used to make heat-resistant and chemical-resistant coatings and silicone solvents. It can also be used for organic synthesis, basic raw materials for preparing advanced crystals, optical glass treatment agents, binders, insulating materials for the electronic industry, etc.
Application
Tetraethyl orthosilicate (TEOS) is a colorless liquid organosilicon compound primarily used as a high‑purity silicon precursor. In the semiconductor industry, electronic‑grade TEOS is essential for chemical vapor deposition (CVD) processes, forming uniform silicon dioxide (SiO₂) thin films that serve as insulating and dielectric layers in integrated circuits, MEMS, and photovoltaic devices. In the coatings industry, TEOS acts as a binder and crosslinking agent for heat‑resistant, anti‑corrosion, and zinc‑rich paints, as well as a protective layer for metal surfaces. It also functions as a reactive monomer in sol‑gel processing to produce silica nanoparticles, aerogels, and hybrid organic‑inorganic materials for advanced composites. Other key applications include precision investment casting as a refractory binder, crosslinking of silicone rubber (RTV) sealants, and consolidation of decayed stone. Xinchem offers custom synthesis, custom chemical synthesis, and contract manufacturing of high‑purity TEOS with flexible scaling from R&D to commercial tons. Contact us for a competitive quote and reliable global supply.
