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3-Isocyanatopropyltrimethoxysilane (ICPTMS)
3-Isocyanatopropyltrimethoxysilane (ICPTMS; CAS 15396-00-6; EC 239-415-9) is a bifunctional, isocyanate-functional silane coupling agent (C₇H₁₅NO₄Si, molecular weight 205.28, boiling point ≈203.8 °C, flash point ≥77 °C) supplied by Royalchem Spain at ≥98% purity. Carrying both a reactive isocyanate (–NCO) group and a hydrolysable trimethoxysilyl group, it chemically bridges organic polymers and inorganic substrates (glass, metals, mineral fillers), making it a high-performance adhesion promoter and crosslinker for moisture-curable polyurethane/urethane and RTV silicone adhesives and sealants, industrial coatings, and surface treatments.
Product Description
3-Isocyanatopropyltrimethoxysilane (ICPTMS)
Bifunctional Isocyanato-Silane Coupling Agent — Adhesion Promoter & Crosslinker for PU/Urethane & RTV Silicone Adhesives, Sealants and Coatings
CAS: 15396-00-6 EC: 239-415-9 Assay: ≥ 98%
3-Isocyanatopropyltrimethoxysilane (ICPTMS, CAS 15396-00-6) is a bifunctional, isocyanate-functional silane coupling agent that carries both a reactive isocyanate (–NCO) group and a hydrolysable trimethoxysilyl group. This dual reactivity lets it chemically bridge organic polymers and inorganic substrates — glass, metals, and mineral fillers — making it a high-performance adhesion promoter and crosslinker for moisture-curable polyurethane/urethane and RTV silicone adhesives and sealants, industrial coatings, and surface treatments; it also grafts silane functionality onto active-hydrogen compounds such as amines and polyols. Royalchem Spain supplies it at ≥ 98% purity as a clear, colourless liquid, delivered from our Valladolid distribution hub under dry conditions by drum with COA and SDS for every batch.
Technical Specifications (COA Data)
| Assay (GC) | ≥ 98% |
| Appearance | Colourless, transparent liquid |
| NCO Content | ≥ 20.07% |
| Colour (APHA / Pt–Co) | ≤ 30 |
| Density (25 °C) | 1.050–1.090 g/cm³ |
| Refractive Index (nD25) | 1.4100–1.4300 |
| Boiling Point | ≈ 203.8 °C (760 mmHg) |
*Regulatory: EINECS-listed (EC 239-415-9); supplied in line with EU REACH requirements; manufactured under ISO 9001. GHS — Danger: fatal if inhaled (H330); harmful if swallowed or in contact with skin (H302, H312); causes severe skin burns and eye damage (H314); may cause allergy or asthma symptoms or breathing difficulties if inhaled (H334) and an allergic skin reaction (H317). An isocyanate-functional, moisture-sensitive silane that reacts with water, alcohols, and amines, releasing CO₂ and methanol — keep strictly anhydrous under dry nitrogen. Shipped as a corrosive/toxic dangerous good — confirm the exact UN number, class, and packing group against the current SDS. Handle only with full PPE, respiratory protection, and effective local exhaust ventilation. Always refer to the current SDS.
Chemical Structure
Key Properties
• Molecular Formula: C₇H₁₅NO₄Si
• Molecular Weight: 205.28
• Boiling Point: ≈ 203.8 °C
• Flash Point: ≥ 77 °C (closed cup)
• Molecular Weight: 205.28
• Boiling Point: ≈ 203.8 °C
• Flash Point: ≥ 77 °C (closed cup)
Main Applications
Adhesives & Sealants
A silane crosslinker and adhesion promoter for moisture-curable polyurethane/urethane and RTV silicone systems, and for end-capping silane-terminated (SPUR / MS) prepolymers to boost cure and substrate bonding.
Coatings & Surface Treatment
An adhesion and durability enhancer for industrial paints and protective coatings, and a primer / coupling agent for the surface treatment of glass, metals, and mineral fillers.
Polymer Modification
Reacts with active-hydrogen compounds (amines, hydroxyls, polyols) through its isocyanate group to graft trimethoxysilyl functionality, building silane-modified polymers and moisture-crosslinkable prepolymers.
Logistics & Packaging
Standard Packaging:
200 kg steel drums, or smaller packs, filled and sealed under dry nitrogen — or to customer requirement. Distributed by Royalchem Spain from our Valladolid hub. Shelf life 12 months in original sealed, dry packaging.
Storage Conditions:
Store in tightly sealed containers in a cool, dry, well-ventilated area, strictly away from water, moisture, alcohols, amines, and strong oxidising agents; nitrogen blanketing is essential. Moisture-sensitive and reactive — it hydrolyses and reacts with active-hydrogen compounds, so keep anhydrous and protect from humid air during transfer.