Silane End Cappers
3-Isocyanatopropyltriethoxysilane | Manta S320
Manta S320 is γ-isocyanatopropyltriethoxysilane (CAS 24801-88-5), an isocyanate-functional silane used as an end-capping agent for silane-modified polymers (SMP and SPUR), an adhesion promoter, and a crosslinker for hydroxyl-bearing resins in sealants, coatings and automotive glass primers. Its ethoxy groups release ethanol on hydrolysis.
- Grade
- S320
- Chemical Name
- γ-Isocyanatopropyltriethoxysilane
- CAS No.
- 24801-88-5
- EINECS
- 246-467-6
- Synonyms
- 3-(Triethoxysilyl)propyl isocyanate; Triethoxy(3-isocyanatopropyl)silane
- Form
- Colorless or light yellow clear liquid
Overview
Manta S320 is an isocyanate-functional silane containing a hydrolyzable triethoxy group. The isocyanate functionality reacts rapidly with active hydrogen-containing compounds, while the silane portion enables moisture-cured crosslinking or adhesion to a variety of substrates.
On hydrolysis, S320 releases ethanol rather than methanol, the by-product of trimethoxy grades such as Manta S310. Formulators who need to avoid methanol as a hydrolysis by-product can therefore select the triethoxy grade.
Key Features
- Reactive with -OH, -NH2 and -SH functional polymers
- Slightly more controlled moisture cure than methoxy variants
- Adhesion promotion, wet and dry, on inorganic substrates such as glass, metal and ceramics
- Siloxane bonds with thermal, chemical and UV stability
- Releases ethanol rather than methanol on hydrolysis
Cross-Reference
Manta S320 can be considered as an alternative to Momentive Silquest A-Link 25 and Shin-Etsu KBE-9007N.
Trademarks are the property of their respective owners; no affiliation is implied.
Specifications
| Property | Typical Value |
|---|---|
| Molecular Weight | 247.37 |
| Appearance | Colorless or light yellow clear liquid |
| Purity (by GC, %) | 96.0 min |
| Density (ρ20°C, g/cm³) | 0.950~1.050 |
| Refractive Index (n25/D) | 1.4140~1.4240 |
| Boiling Point | 283°C |
| Flash Point | 77 °C Closed Cup |
Typical values from the current Technical Data Sheet.
Applications
- SMP and SPUR manufacture: end-capping agent for diols or polyol polymers to produce silane-modified polymers (MS polymer) and SPUR systems
- Adhesion promoter: silicone sealants, polyurethane paints and hybrid adhesives that need adhesion to organic plastics such as nylon, or to inorganic substrates presenting active hydrogen species
- Resin crosslinking: modifier for hydroxyl-bearing resins such as acrylic resins and PVA, and for alkoxy-silyl crosslinked fluororesin fluids, improving weatherability and chemical resistance
- Reactive additive: one-part moisture-curable and two-part reactive polyurethane systems
- Automotive glass primers: adhesion promoter in polyurethane primers for automotive glass replacement (AGR)
Related applications: Adhesives & Sealants · Paints & Coatings · Plastics & Masterbatches
Packaging & Storage
Supplied in 20 kg, 25 kg iron pail, 200 kg drum.
Safety and Storage
Keep in a cool and dry place and avoid storage in direct sunlight. Shelf life is min. 12 months. It is shipped as hazardous substance.
Documents
- Technical Data Sheet · PDF Download TDS
- SDS and COA · on request Request Documents
Frequently Asked Questions
How does Manta S320 differ from Manta S310?
Both are isocyanate-functional silanes used as end-cappers. S320 carries triethoxy groups and releases ethanol on hydrolysis, while S310 carries trimethoxy groups and releases methanol. S320 gives a slightly more controlled moisture cure than methoxy variants, so the choice depends on the cure profile and by-product requirements of your system.
Which polymer systems can Manta S320 crosslink or modify?
It reacts with -OH, -NH2 and -SH functional polymers and serves as a modifier for hydroxyl-bearing resins such as acrylics and PVA, as well as alkoxy-silyl crosslinked fluororesin fluids, improving weatherability and chemical resistance.
How is Manta S320 used in automotive glass primers?
It is used as an adhesion promoter in polyurethane primers for automotive glass replacement (AGR), where it provides adhesion to glass and releases ethanol rather than methanol on hydrolysis.
What are the packaging, storage and transport details for Manta S320?
Packaging: 20 kg, 25 kg iron pail, 200 kg drum. Keep in a cool and dry place and avoid storage in direct sunlight. Shelf life is min. 12 months. It is shipped as a hazardous substance.
Related Products
S320 is one step in the sealant and adhesive formulation chain. One inquiry can cover the other raw materials in your formulation, with samples, technical documents, quotation and shipment handled together.
Looking for a different purity, functional group, or a structure not listed here? Contact our technical team.
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