Silane & Intermediate

N-Octyltriethoxysilane Silway740


Silway-740 is high purity, undiluted N-octyltriethoxysilane. Treated substrate with 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. After using Silway-740 silane, the protection effect would be obvious on highly alkaline new concrete (less than on year old), but be poor on old concrete or neutral substrates.

Technical Index




Transparent liquid

Active Content


Density (g/cm3)


Boiling Point(760mmHG), ℃



• Permeability to gas and water vapor.

• Resistance to ultraviolet light (UV), heat, and oxidative degeneration.

• Durability and mechanical and chemical adhesion.

• Stable in storage


Hydrophobic impregnation and priming of concrete and reinforced concrete in road, bridge and building construction.

Raw material for silicone water repellent


• In order to achieve optimal application results, new surfaces that are still unsoiled must be cleansed of coarse particles and dust deposits by sweeping or, if necessary, using compressed air. Surfaces already weathered, and those heavily soiled by oil, rubber residue, etc., must first be cleaned using superheated steam or high-pressure water before commencing treatment.

• It is strongly recommended carry out preliminary tests to determine the optimum quantity for particular application.

• Keep container tightly closed once opened

Packing :200L Drums or 1000L IBC totes


• Storing in a cool, dry and ventilated place, avoid strong sunlight and contacting with acid, alkali and oxidizing agents.

•Minimum temperature allowed during storage and transportation: 0 °C

•Maximum temperature allowed during storage andtransportation: 30 °C

•Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons..

Shelf Life :24 months





The Way of Silicone Innovation

Hangzhou Silway New Material Technology Co.,Ltd. Founded in 2014, is a young but fast-growing N-Octyltriethoxysilane Silway740 manufacturer specialized in the research, development, production and marketing of N-Octyltriethoxysilane Silway740.

Silway focused on the modified siloxane and formulation technology, product line covers from agricultural silicone adjuvant, silicone water repellent, cosmetic silicones, sealant & additive, modified siloxane for die-casting.etc.

  • R&D

    Founders have over 20 years’ technical experience in silicone industry

  • Quality

    ISO9001 Certificated

  • Service

    Sales for international market all have at least 5 years experience, easy to communicate and professinal in silicone industry.

  • OEM

    Offer OEM service and customized products.

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N-Octyltriethoxysilane Silway740 Industry Knowledge Extension