Gelest SIO6645.0

Knowde Enhanced TDS

Identification & Functionality

Chemical Family: Silanes
Chemical Name: Octadecyltrimethoxysilane
Base Chemicals Functions: Intermediate
Molecular formula: C₂₁H₄₆O₃Si
Technologies: Base Chemicals & Intermediates
Product Families: Base Chemicals & Intermediates — Intermediates
Other Intermediates
Chemical Structure

Features & Benefits

Features: Contains 5-10% C18 isomers

Forms hydrophobic, oleophilic coatings

Forms clear, ordered films with tetramethoxysilane

Undergoes oscillatory adsorption to form SAMs

Trialkxoy silane

Applications & Uses

Markets: Industrial
Applications: Industrial — Chemical & Industrial Manufacturing
Chemical Manufacturing
Applicable Processes: Chemicals Production

Properties

	Value	Units	Test Method / Conditions
Boiling Point (at 0.1 mmHg)	170.0	°C	-
Melting Point	13 - 17	°C	-

	Value	Units	Test Method / Conditions
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	-

	Value	Units	Test Method / Conditions
C18 Isomers	5 - 10	%	-

Regulatory & Compliance

Chemical Inventories: AICS (Australia),
ECL (Korea),
EINECS (EU),
IECSC (China),
INSQ (Mexico),
ISHL (Japan),
NDSL (Canada),
PICCS (Phillipines),
TSCA (USA)

Technical Details & Test Data

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.

Packaging & Availability