Siwin-9431
Siwin
Siwin-9431
18395-30-7
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Isobutyltrimethoxysilane (Siwin-9431) is an alkyltrimethoxysilane compound that functions as a hydrophobic surface modifier across industrial applications. With the CAS registry number 18395-30-7, this colorless liquid carries reactive methoxy groups that hydrolyze upon contact with moisture, forming silanol groups capable of bonding to mineral surfaces. The isobutyl alkyl group provides organic compatibility and water-repellent properties to treated substrates.
Registered under the EPA Substance Registry System and referenced in the NIST Chemistry Reference database under the name Prosil 178, Siwin-9431 serves as a surface treatment agent for construction materials, fillers, and particulate systems. It is known by trade names including Dynasylan IBTMO and is classified under the TSCA inventory. Commercial users in building materials, polymer compounding, and surface treatment sectors incorporate this silane to modify surface energy and improve water resistance.
Product Name | Isobutyltrimethoxysilane |
Synonyms | ISOBUTYLTRIMETHOXYSILANE;Trimethoxy(2-methylpropyl)silane;CI7810;Dynasylan IBTMO;Silane, trimethoxy(2-methylpropyl)-;trimethoxy(2-methylpropyl)-silan;Isobutyltrimethoxysilane Prosil R 178;Isobutyltrimethoxysilan |
CAS | 18395-30-7 |
MF | C7H18O3Si |
MW | 178.3 |
EINECS | 242-272-5 |
Product Categories | Alkoxy Silanes;Hydrophobing Agents;Organosilicon;Silanes;Organometallic Reagents;Solution Deposition Precursors;Trialkoxysilanes;RSi(OR)3;Self Assembly and Contact Printing;POSS Precursors and Intermediates;Self-Assembly Materials;Silsesquioxanes: POSS Nanohybrids |
Melting point | <0°C |
Boiling point | 154 °C(lit.) |
density | 0.93 g/mL at 25 °C(lit.) |
refractive index | n20/D 1.396(lit.) |
Fp | 103 °F |
form | solution |
Specific Gravity | 0.933 |
Sensitive | Moisture Sensitive |
Hydrolytic Sensitivity | 7: reacts slowly with moisture/water |
CAS DataBase Reference | 18395-30-7(CAS DataBase Reference) |
NIST Chemistry Reference | Prosil 178(18395-30-7) |
EPA Substance Registry System | Silane, trimethoxy(2-methylpropyl)- (18395-30-7) |
Hazard Class | 3 |
Packing Group | III |
Siwin-9431 serves as a water-repellent treatment for concrete, reinforced concrete, and other porous construction materials. When applied as a dilute solution, the silane penetrates substrate pores and reacts with surface hydroxyl groups, forming a covalently bonded hydrophobic layer. Treated surfaces maintain their original appearance while exhibiting reduced water absorption. This application supports durability by limiting water ingress that contributes to freeze-thaw damage and chloride penetration.
Industrial formulators use isobutyltrimethoxysilane to modify the surface of mineral fillers and pigments. The treatment improves the dispersion of inorganic particles in non-polar polymer matrices and organic solvent systems. Treated calcium carbonate, talc, and silica fillers show enhanced compatibility with polyolefins and other hydrophobic resin systems, supporting compounding processes in polymer manufacturing.
In sol-gel chemistry, Siwin-9431 functions as a trialkoxysilane precursor for the synthesis of organically modified silicates and silsesquioxane (POSS) nanohybrid materials. Its three methoxy groups participate in hydrolysis and condensation reactions, contributing to crosslinked siloxane networks. The isobutyl group imparts organic character to the resulting hybrid materials, influencing flexibility, surface properties, and thermal behavior.
Siwin-9431 is supplied in standard industrial packaging configurations suitable for commercial procurement. The material requires storage in a cool, dry environment with sealed containers to prevent premature hydrolysis from atmospheric moisture. Exposure to humid conditions should be minimized. As a Class 3 flammable liquid with Packing Group III classification, handling procedures must follow standard industrial chemical safety protocols. Material Safety Data Sheets (MSDS) are available upon request for detailed hazard assessment and emergency response guidance.
Siwin produces Siwin-9431 under documented manufacturing processes with batch-level quality control. Each production lot undergoes gas chromatography (GC) analysis to verify purity, alongside refractive index measurement and density testing. Certificates of Analysis (COA) are available for every shipment, reporting batch-specific test results against specification parameters. The manufacturing facility maintains inventory levels that support bulk orders from enterprise customers, with production capacity aligned to ongoing industrial demand for alkoxysilane products.
Isobutyltrimethoxysilane is primarily used as a hydrophobic surface modifier for construction materials such as concrete and masonry, as a surface treatment agent for mineral fillers and pigments in polymer compounding, and as a precursor in sol-gel chemistry for producing organically modified silicate materials.
Store in tightly sealed containers in a cool, dry location away from direct sunlight and moisture sources. The material is moisture-sensitive and will undergo gradual hydrolysis upon exposure to atmospheric humidity. Recommended storage temperature ranges from 2°C to 8°C for extended shelf life.
Siwin-9431 is manufactured with a minimum purity of 97% as measured by gas chromatography (GC). Each batch is accompanied by a Certificate of Analysis detailing purity level, refractive index, density, and other specification parameters.
Yes, isobutyltrimethoxysilane is compatible with other alkoxysilanes and is often used in combination with amino-functional or epoxy-functional silanes to tailor surface properties. Formulators typically adjust ratios based on target substrate and desired performance characteristics.
