Overview
Isobutyltrimethoxysilane (CAS 18395-30-7 ) is an organosilane monomer used to modify inorganic surfaces and improve compatibility between mineral substrates and organic polymer matrices.
It functions as a surface treatment agent and crosslinker, bridging the gap between hydrophilic fillers and hydrophobic resins. In coatings and sealants, it acts as a surface modifier for silica.
This chemical treats calcium carbonate and other mineral fillers, improving dispersion and reducing moisture sensitivity in the final formulation. Construction sealants use it as a crosslinking agent.
It enhances adhesion to glass, concrete, and metal substrates. In plastics compounding, it treats reinforcing fillers to improve mechanical performance and long-term durability of the polymer matrix.
Electronics manufacturers apply it as a surface treatment for encapsulants and underfill materials where controlled hydrophobicity and adhesion to substrates are critical for the final product.
Isobutyltrimethoxysilane is supplied as a clear liquid in standard packaging ranging from drums to IBC containers. Technical grade is the primary commercial form for industrial use.
Purity levels are typically at 97% or higher. Buyers sourcing for sensitive electronics or high-performance polymer applications should confirm purity specifications and moisture content with the supplier.
Procurement teams should ensure the material meets necessary industrial requirements. Proper storage in a cool, dry environment is essential to maintain the stability of this organosilane monomer.
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Physical Properties
| Melting Point | <0°C |
| Boiling Point | 154 °C |
| Density | 0.933 g/cm³ |
| Flash Point | 103 °F |
| Appearance | Colorless clear liquid. |
| Form | solution |
| Vapor Pressure | 1.9hPa at 25℃ |
| Refractive Index | n 20/D 1.396(lit.) |
| Log P | 2.1 at 20℃ |
Safety & Handling
Warning GHS02 GHS07 Hazard Statements H226 Flammable liquid and vapor H302 Harmful if swallowed H315 Causes skin irritation H319 Causes serious eye irritation H332 Harmful if inhaled H335 May cause respiratory irritation H336 May cause drowsiness or dizziness Precautionary Statements P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking. P233 Keep container tightly closed. P240 Ground and bond container and receiving equipment. P241 Use explosion-proof [electrical/ventilating/lighting/…] equipment. P242 Use non-sparking tools. P243 Take action to prevent static discharges. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P317 Get emergency medical help. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P370+P378 Use … for extinction. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P403+P235 Store in a well-ventilated place. Keep cool. P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| UN Number | 1993 |
| ADR Class | 3 |
| Packing Group | III |
| Storage Class | 3 - Flammable liquids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 18395-30-7
- EC Number
- 242-272-5
- Mol. Weight
- 178.30
- Category
- Monomers & Building Blocks