Gelest SIO6645.0
- CAS Number
- 3069-42-9
- Chemical Name
- Octadecyltrimethoxysilane
- Chemical Family
- Silanes
- Molecular Formula
- C₂₁H₄₆O₃Si
Gelest n-OCTADECYLTRIMETHOXYSILANE (SIO6645.0) forms hydrophobic, oleophilic coatings. It functions as an intermediate and is commonly used in chemical production.
Properties
- Physical Form
- Liquid
Product families
Applications
- Chemical Manufacturing
Product Families
- Other Intermediates
Other characteristics
- Functions
- Intermediate
- Markets
- Industrial
- Features
Contains 5-10% C18 isomers; Forms hydrophobic, oleophilic coatings; Forms clear, ordered films with tetramethoxysilane; Undergoes oscillatory adsorption to form SAMs; Trialkxoy silane
- Technology
- Base Chemicals & Intermediates
- Standard Packaging
- 25 g
- 500 g
- 2 kg
- 15 kg
- 160 kg
- Applicable Processes
- Chemicals Production
- Chemical Inventories
- AICS (Australia)
- ECL (Korea)
- EINECS (EU)
- IECSC (China)
- INSQ (Mexico)
- ISHL (Japan)
- NDSL (Canada)
- PICCS (Phillipines)
- Base Chemicals Functions
- Intermediate
- Conventional Surface Bonding
Aliphatic, fluorinated aliphatic or substituted aromatic hydrocarbon substituents are the hydrophobic entities which enable silanes to induce surface hydrophobicity. The organic substitution of the silane must be non-polar. The hydrophobic effect of the organic substitution can be related to the free energy of transfer of hydrocarbon molecules from an aqueous phase to a homogeneous hydrocarbon phase. A successful hydrophobic coating must eliminate or mitigate hydrogen bonding and shield polar surfaces from interaction with water by creating a non-polar interphase.. Although silane and silicone derived coatings are in general the most hydrophobic, they maintain a high degree of permeability to water vapor. This allows coatings to breathe and reduce deterioration at the coating interface associated with entrapped water. Since ions are not transported through non-polar silane and silicone coatings, they offer protection to composite structures ranging from pigmented coatings to rebar reinforced concrete.
Technical data
Table 1 of 3
2 rows| Characteristic | Value | Unit |
|---|---|---|
| Boiling Point (at 0.1 mmHg) | 170.0 | °C |
| Melting Point | 13 - 17 | °C |
Table 2 of 3
6 rows| Characteristic | Value | Unit |
|---|---|---|
| Hydrolytic Sensitivity | 7 (Reacts slowly with moisture/water) | — |
| Molecular Weight | 374.68 | g/mol |
| Purity (including isomers) | 92.0 | % |
| Density | 0.885 | g/ml |
| Refractive Index (at 20°C) | 1.439 | — |
| Flash Point | 140.0 | °C |
Table 3 of 3
1 row| Characteristic | Value | Unit |
|---|---|---|
| C18 Isomers | 5 - 10 | % |
