Octadecyltrimethoxysilane (C18) | Manta L1831

Manta L1831 is n-octadecyltrimethoxysilane (CAS 3069-42-9, ≥95.0% GC purity), a C18 alkyl silane used for superhydrophobic and self-cleaning coatings, mineral filler treatment in polyolefins, pigment dispersion and semi-permanent mold release. Its 18-carbon chain gives very low surface energy with virtually no volatility, and the liquid solidifies to a waxy solid below about 17°C.

Manta L1831 is a monomeric long-chain alkylfunctional silane, chemically identified as n-octadecyltrimethoxysilane. Featuring an exceptionally long 18-carbon (C18) linear aliphatic chain, this product delivers unparalleled hydrophobicity and extreme lipophilicity (affinity for non-polar environments).

The highly non-polar nature of its massive octadecyl group drastically minimizes surface energy, making Manta L1831 an elite surface modifier for inorganic substrates, minerals, and pigments. Upon exposure to moisture, its reactive methoxy groups undergo rapid hydrolysis to form durable, covalent siloxane bonds with the substrate. Concurrently, the long C18 chain extends outward to create a dense, highly water-repellent protective layer.

Due to its high molecular weight, Manta L1831 exhibits virtually no volatility and outstanding thermal stability. It is particularly highly regarded in applications demanding superhydrophobic surfaces, heavy-duty mineral filler treatments for polyolefins, and the highly specialized surface modification of submicron or nano-particles.

1. Mineral Filler Treatment (Plastics & Rubber):  A highly effective surface modifier for inorganic fillers (like ATH, MDH, and silica) in polyolefins. It drastically reduces melt viscosity, significantly improves processability, and maintains mechanical strength for highly loaded polymer compounds.
2. Superhydrophobic Coatings:  Ideal for formulating premium superhydrophobic (lotus effect) and self-cleaning coatings. It provides extreme, long-lasting water repellency for concrete, glass, and ceramics by drastically lowering the substrate’s surface energy.
3. Pigment Dispersion:  Prevents the agglomeration of ultrafine pigments (e.g., TiO2) and nanoparticles, ensuring rapid wetting, excellent dispersion, and higher color strength in masterbatches and industrial coatings.
4. Mold Release:  Acts as a highly thermally stable, semi-permanent release agent in rigorous plastic and rubber molding processes, owing to its exceptional non-polar properties and high thermal resistance.