Silanes for Surface Treatment & Coatings
Hydrophobic surface modification, construction water repellency, sol-gel coatings, PFAS-free textile finishing, LED encapsulant chemistry, chromate-free corrosion protection, and precision casting binders.
Request Samples & TDSSurface treatment silanes modify the surface energy, chemical reactivity, or optical properties of a substrate — without functioning as coupling agents between two bulk materials. Some form thin-film networks on the surface (sol-gel coatings from TEOS, masonry water repellent systems from MTMS). Others graft individual molecules onto the surface to change its wetting behavior (alkylsilanes making textiles hydrophobic, PhTMS tuning the refractive index of an LED encapsulant). What unites this category is that the silane is the final functional material, not a hidden interface buried inside a composite.
The regulatory environment is driving demand in two segments. The EU’s PFAS restriction proposal, with textile and waterproofing provisions expected to take effect from 2026–2027, has created urgent demand for non-fluorinated water-repellent alternatives. Alkylsilane treatments — from C8 octylsilane through C16 hexadecylsilane — provide the most technically credible PFAS-free route to durable hydrophobicity on fabrics, masonry, and industrial surfaces. Separately, the REACH restriction on hexavalent chromium is pushing aerospace and automotive OEMs toward chromate-free corrosion protection, where bridged silsesquioxane (BTESE) sol-gel primers are emerging as a validated replacement.
MTMS(Methyltrimethoxysilane)New
CAS 1185-55-3
Methylsilane for construction water repellency, silicone resin synthesis, and sol-gel hybrid coating formation. MTMS is one of the highest-volume organosilanes manufactured globally, consumed in large quantities for silicone-based masonry water repellent emulsions that protect concrete, brick, and natural stone facades against moisture penetration without altering surface appearance or blocking vapor diffusion. The treatment works by forming a polymethylsiloxane network in situ on the mineral substrate. Concentrated MTMS emulsions are diluted on-site and applied by spray or roller. Service life on well-prepared masonry substrates is typically 10–20 years.
Silicone masonry and concrete water repellent systems, anti-graffiti coatings, silicone resin precursor for high-temperature coatings, sol-gel hybrid coating co-precursor, facade protection treatments. Key industries: construction chemicals, architectural facade treatment, protective coatings.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →OTES(n-Octyltriethoxysilane)
CAS 2943-75-1
C8 alkylsilane for hydrophobic surface modification. The octyl chain provides moderate hydrophobicity when grafted onto oxide surfaces — sufficient for many filler treatment and surface modification applications, but below the water contact angles achievable with longer-chain alternatives. OTES is widely used as a PFAS-free water-repellent treatment for textiles where full fluorocarbon-equivalent performance is not required, and as a general-purpose hydrophobic modifier for mineral fillers and pigments in polymer compounding.
Hydrophobic filler and pigment treatment, PFAS-free water-repellent textile finishing (moderate performance tier), anti-fingerprint coatings, self-cleaning surface modification, filler treatment for polyolefin compounds.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →HDTMS(Hexadecyltrimethoxysilane)New
CAS 16415-12-6
C16 long-chain alkylsilane delivering the highest hydrophobicity available from non-fluorinated silane chemistry. Water contact angles on HDTMS-treated surfaces approach 110–115° — substantially higher than C8 alkylsilanes and competitive with the range historically achievable only through fluorocarbon treatments. This positions HDTMS as the primary candidate chemistry for PFAS-free durable water-repellent (DWR) finishing on technical textiles, outdoor apparel, and performance fabrics. The hexadecyl chain creates dense, well-ordered self-assembled monolayers on oxide surfaces. The resulting hydrophobicity is more durable against wash cycling than shorter-chain alternatives because the longer chains pack more tightly and resist mechanical disruption.
PFAS-free durable water-repellent textile finishing, superhydrophobic surface coatings, long-chain filler surface modification, self-assembled monolayer formation, anti-icing surface treatments, outdoor fabric and gear treatment. Key industries: technical textiles, outdoor apparel, industrial surface treatment.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →PTMS(Propyltrimethoxysilane)New
CAS 1067-25-0
Short-chain alkylsilane for general-purpose hydrophobic filler treatment. The propyl group provides basic surface energy reduction at lower cost per kilogram than longer-chain alternatives, making PTMS the economical choice for high-volume filler modification where moderate hydrophobicity is sufficient. Used to improve dispersion and reduce moisture sensitivity of precipitated silica, calcium carbonate, alumina trihydrate, and talc in polymer compounding operations where the filler loading is high and coupling agent cost must be controlled.
Mineral filler surface treatment (PCC, silica, ATH, talc), general hydrophobic surface modification, cost-effective filler pre-treatment for polymer compounding. Key industries: polymer compounding, mineral filler processing, rubber goods manufacturing.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →TEOS(Tetraethyl Orthosilicate)New
CAS 78-10-4
Silicate ester and the primary precursor for sol-gel silica network formation. TEOS hydrolyzes to form silanol intermediates that condense into amorphous silica or silicate networks — with the resulting structure (dense glass-like film, porous aerogel, colloidal sol, or ceramic shell) determined by reaction conditions: pH, water ratio, solvent, temperature, and catalyst. In precision investment casting (lost-wax process), hydrolyzed TEOS serves as the primary binder for ceramic shell molds — one of the highest-volume organosilicon applications in manufacturing. In semiconductor fabrication, TEOS-derived SiO₂ films are deposited by CVD and PECVD for interlayer dielectric and passivation layers.
Precision investment casting shell binders, sol-gel anti-reflective and protective optical coatings, semiconductor dielectric film precursor (CVD/PECVD SiO₂), silica aerogel and xerogel synthesis, zinc-rich anti-corrosion primer binder, colloidal silica production, catalyst support preparation. Key industries: precision foundry, semiconductor, optical coatings, advanced ceramics, anti-corrosion.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →PhTMS(Phenyltrimethoxysilane)New
CAS 2996-92-1
Aryl-functional silane for refractive index modification, thermal stability enhancement, and UV transparency in silicone resin and sol-gel coating systems. Phenyl groups raise the refractive index of cured silicone networks (n ≈ 1.47–1.53 vs. n ≈ 1.40–1.43 for methyl-functional silicones) while improving thermal decomposition onset above 250°C and maintaining optical clarity under UV exposure. In LED packaging, phenyl-modified silicone encapsulants extract light more efficiently from high-brightness dies because the higher refractive index reduces total internal reflection at the die-encapsulant interface.
LED encapsulant refractive index modification, high-temperature silicone resin synthesis, optical sol-gel coating precursor, phenyl-modified hybrid coating networks, heat-resistant electrical insulation coatings. Key industries: LED packaging, silicone resin manufacturing, optical coatings, high-temperature industrial coatings.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
Request Specifications →BTESE(1,2-Bis(triethoxysilyl)ethane)New
CAS 16068-37-4
Bridged silsesquioxane precursor for chromate-free corrosion protection and high-barrier thin-film coatings. The ethylene bridge between two triethoxysilyl groups produces, upon hydrolysis and condensation, a network that is denser and more mechanically robust than TEOS-derived pure silica — while retaining organic flexibility that prevents the cracking and delamination that limits brittle inorganic sol-gel coatings on flexible or thermally cycling substrates. BTESE-based sol-gel primers are validated as replacements for hexavalent chromium conversion coatings in aerospace and automotive applications. The films (50–500 nm) provide effective barrier properties against oxygen, moisture, and chloride ion penetration.
Chromate-free anti-corrosion primers for aerospace aluminum alloys and automotive bodies (Cr⁶⁺ replacement), gas separation membrane synthesis, high-barrier protective coatings, flexible hybrid silsesquioxane network formation, crack-resistant sol-gel films on thermally cycling substrates. Key industries: aerospace corrosion protection, automotive OEM coatings, membrane technology, advanced protective coatings.
Packaging: 200 kg steel drums, 1,000 kg IBC totes.
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