Overview
Octyltriethoxysilane (CAS 2943-75-1 ) is an organosilane coupling agent and surface modifier used across coatings, sealants, and polymer systems. It bonds inorganic substrates to organic matrices, improving adhesion and water repellency.
In coatings and sealants, it functions as a hydrophobic surface treatment for mineral fillers such as silica and calcium carbonate. This reduces moisture uptake and improves dispersion in the final formulation.
Silicone elastomers and rubber compounds use it as a crosslinking and compatibilization agent. This enhances mechanical performance and filler-polymer bonding for long-term durability in finished products.
In plastics, it improves the interfacial adhesion between glass fiber reinforcements and polymer matrices. This directly affects tensile strength and processing consistency during the manufacturing stage.
Personal care formulators apply it to treat pigments and powders, producing surface-modified particles. These particles offer improved skin feel and oil dispersibility for high-end cosmetic applications.
Octyltriethoxysilane is supplied as a clear liquid, typically in drums, IBCs, and bulk quantities suited to industrial procurement volumes. It is available in technical grade for industrial applications.
High-purity grades are offered for specialty coating and personal care end uses. Concentration and purity specifications vary by supplier, and buyers should confirm silane content with the technical datasheet.
Buyers should also verify hydrolysis stability and compliance with relevant industrial standards. This ensures the material meets the specific requirements of the intended chemical formulation or process.
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Physical Properties
| Melting Point | <-40 °C |
| Boiling Point | 98-99 °C @ Press: 2 Torr |
| Density | 0.875 g/cm³ |
| Flash Point | 210 °F |
| Appearance | Colorless transparent liquid |
| Color | Colorless to Almost colorless |
| Odor | Mild odor |
| Form | liquid |
| Water Solubility | reacts |
| Vapor Pressure | 0.1 hPa (20 °C) |
| Refractive Index | n 20/D 1.417(lit.) |
| Log P | -0.3-6.41 at 20℃ |
Safety & Handling
Warning GHS02 GHS07 GHS09 Hazard Statements H226 Flammable liquid and vapor H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation H411 Toxic to aquatic life with long lasting effects Precautionary Statements 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. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P391 Collect spillage. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29310095 |
| Storage Class | 10 - Combustible liquids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 2943-75-1
- EC Number
- 220-941-2
- Mol. Weight
- 276.49
- HS Code
- 29310095
- Category
- Silicones & Silicates