All structures are computer generated. Please rely on the product data below for placing your order. If you see any errors in structures, please email customer service so that they can be addressed.


Product Code: SIO6629.0

Cas No: 70851-50-2

100 g
25 g
Alkyl Silane - 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. A selection guide for hydrophobic silanes can be found on pages 22-31 of the Hydrophobicity, Hydrophilicity and Silane Surface Modification brochure.

n-Octadecylmethyldimethoxysilane; Dimethoxymethyl-n-octadecylsilane; Methyldimethoxysilyloctadecane; Dimethoxymethylsilyloctadecane
  • Contains 5-10% C18 isomers
  • Dialkoxy silane
  • EINECS Number: 274-936-5

    Specific Gravity: 0.85

    Flashpoint: >110°C (>230°F)

    HMIS Key: 3-1-0-X

    Hydrolytic Sensitivity: 7: reacts slowly with moisture/water

    Formula: C21H46O2Si


    Refractive Index: 1.4427

    Additional Properties: 225
    Contains 5-10% C18 isomers