N-Octyltriethoxysilane | Manta L320

Manta L320 is n-octyltriethoxysilane (CAS 2943-75-1, ≥98.0% GC purity; INCI Triethoxycaprylylsilane) used as a penetrating water repellent for concrete and masonry, a mineral filler modifier, and a surface treatment for cosmetic pigments and powders. It is comparable to Dow OFS-6341, Evonik OCTEO, Wacker GENIOSIL OCTEO and Shin-Etsu KBE-3083, releasing ethanol on hydrolysis.

Manta L320 is a monomeric alkyl-functional organosilane. Formulated as a clear, undiluted N-octyltriethoxysilane, it features a low molecular weight that enables deep penetration into porous cementitious and mineral substrates. In the presence of ambient moisture and an alkaline or acidic environment, the ethoxy groups hydrolyze to form reactive silanols, which subsequently chemically bond to the substrate. The resulting octyl-functional siloxane network provides durable, invisible water repellency without altering the substrate’s natural breathability or appearance

It is equivalent to MPM A-137, Dow OFS-6341, Evonik OCTEO, Wacker GENIOSIL® OCTEO, and Shin-Etsu KBE-3083.

Properties

• Exceptional Hydrophobicity: Creates a permanent, chemically bonded water-repellent barrier in mineral substrates, drastically inhibiting capillary water absorption.
• Deep Penetration: Low viscosity and small molecular size ensure excellent depth of penetration into concrete and masonry.
• Filler Modification: Significantly improves the compatibility, wetting, and dispersion of polar mineral fillers in non-polar polymer matrices (polyolefins, rubbers).
• High Alkali Resistance: The functional siloxane network demonstrates outstanding stability in highly alkaline environments (e.g., freshly cast concrete).

Formulated as a clear, undiluted N-octyltriethoxysilane, it features a low molecular weight that enables deep penetration into porous cementitious and mineral substrates. In the presence of ambient moisture and an alkaline or acidic environment, the ethoxy groups hydrolyze to form reactive silanols, which subsequently chemically bond to the substrate. The resulting octyl-functional siloxane network provides durable, invisible water repellency without altering the substrate’s natural breathability or appearance

It is equivalent to MPM A-137, Dow OFS-6341, Evonik OCTEO, Wacker GENIOSIL® OCTEO, and Shin-Etsu KBE-3083.

1. Architectural Waterproofing: When appropriately diluted in organic solvents, L320 serves as a high-performance penetrating water repellent for concrete, brick, and natural stone, protecting structures from freeze-thaw damage and chloride ion ingress.
2. Inorganic Powder Surface Treatment: Acts as a highly efficient surface modifier for mineral fillers (e.g., ATH, MDH, magnesium oxide) to reduce viscosity and improve the mechanical properties of highly filled polymer compounds.
3. Cosmetics & Personal Care: Operating under the INCI name Triethoxycaprylylsilane, L320 is widely utilized as a premium surface treating agent for cosmetic pigments and powders (such as titanium dioxide, zinc oxide, mica, and talc). It covalently bonds to the powder surface, forming a durable, lipophilic coating that significantly enhances dispersion, sensory profile, and wash-resistance in color cosmetics and sunscreens.