RememberRegistered Now



n-Octyltriethoxysilane RJ-OTES

※MSDS Download ※TDS Download Inquiry


Chemical name: n-Octyltriethoxysilane

CAS No.: 2943-75-1

Molecular Formula: C14H32O3Si

RJ-OTES is high purity, undiluted n-Octyltriethoxysilane. Treated substrate with RJ-OTES will have good water repellent performance and retain the original appearance. Alkaline environments, such as pouring concrete, will stimulate the reaction and accelerate the formation of hydrophobic layers.

RJ-OTES is also widely used as raw materials of many silicone water repellents.

Technical Index

Property  Specification
Appearance  Clear liquid
Purity  97.0min
Molecular weight  276.49
Density(ρ20)g/cm3  0.8790± 0.0050
Refractive index, ηD25℃  1.417 ± 0.0050
Boiling Point(760mmHG), ℃  265
Water Solubility  Decomposes


n-Octyltriethoxysilane RJ-OTES could be used as surface treating agent on filler and pigment particles like titanium dioxide, to improve the dispensability and be used in concrete, cement and so on inorganic material surface, to protect them with good water repellency.As a long chain alkyl silane coupling agent, it also can be used compatibility of them together with coating, adhesive and sealant.


180 kgs iron drum or other packing on request


Sealed and store under 5-30℃ temperature. Avoid high temperature and freezing conditions.

Shelf life

Shelf life: 24 months.

Click here to view more silicone water repellents we are supplying.