![Chemical structure of 1,3,5-tris[3-(trimethoxysilyl)propyl]isocyanurate (Manta S311)](/images/products/manta-s311-tris-trimethoxysilylpropyl-isocyanurate-chemical-structure.webp)
Adhesion Promoters
Tris(trimethoxysilylpropyl) Isocyanurate | Manta S311
Manta S311 is 1,3,5-tris[3-(trimethoxysilyl)propyl]isocyanurate (CAS 26115-70-8), a low-volatility adhesion promoter used in reactive hot melt adhesives, SPUR and MS polymer sealants, and high-temperature coatings. Its isocyanurate ring maintains structural integrity at sustained elevated temperatures, and it improves adhesion without sacrificing the flexibility of the final sealant.
- Grade
- S311
- Chemical Name
- 1,3,5-tris[3-(trimethoxysilyl)propyl]isocyanurate
- CAS No.
- 26115-70-8
- EINECS
- 247-465-8
- Synonyms
- Tris(3-trimethoxysilylpropyl)cyclotriisocyanurate; Tris[(trimethoxysilyl)propyl]isocyanurate
- Form
- Colorless or yellowish transparent slightly viscous liquid
Overview
Manta S311 is a high-molecular-weight adhesion promoter with a stable isocyanurate ring structure and dispersed trimethoxysilyl groups. Unlike highly basic aminosilanes or highly reactive isocyanates, it offers a mild reactivity profile and very low volatility.
This design allows formulators to boost the adhesion of sealants and adhesives to difficult substrates without sacrificing elastomeric flexibility. It is especially relevant to applications exposed to sustained elevated temperatures, such as hot melt adhesives (HMA), where its molecular weight of 615.85 and boiling point of 250°C help to retain the silane during high-temperature compounding.
S311 has propyl-linked silyl groups and a mild reactivity profile. Manta AM311 shares the isocyanurate core but carries alpha-functional silyl groups for very fast moisture curing. Select S311 when a mild reactivity profile is needed and AM311 when fast moisture curing is the priority.
Key Features
- Isocyanurate ring maintains structural integrity at sustained elevated temperatures
- High molecular weight and boiling point give good silane retention during high-temperature compounding
- Very low basicity; improves adhesion without embrittling the final sealant
- Reliable adhesion to unprimed plastics, glass, aluminum and steel
- Compatible with a wide range of hot melt resins and moisture-curable prepolymers
Cross-Reference
Manta S311 can be considered as an alternative to Momentive Silquest A-Link 597 and Shin-Etsu KBM-9659.
Trademarks are the property of their respective owners; no affiliation is implied.
Specifications
| Property | Typical Value |
|---|---|
| Molecular Weight | 615.85 |
| Appearance | Colorless or yellowish transparent slightly viscous liquid |
| Purity (by GC, %) | 93.0 min |
| Density (ρ20°C, g/cm³) | 1.170～1.185 |
| Boiling Point | 250°C |
| Flash Point | 102°C Closed Cup |
Typical values from the current Technical Data Sheet.
Applications
- Hot melt adhesives: silane adhesion promoter in reactive polyolefin (POR) and polyurethane (PUR) hot melts
- SPUR and MS polymer sealants: additive that improves adhesion to difficult substrates without compromising the high-movement capability of the joint
- High-temperature coatings: crosslinker and adhesion promoter in specialized industrial coatings exposed to thermal cycling
Related applications: Adhesives & Sealants · Paints & Coatings
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.
Documents
- Technical Data Sheet · PDF Download TDS
- SDS and COA · on request Request Documents
Frequently Asked Questions
Why is Manta S311 suited to reactive hot melt adhesives (POR/PUR)?
Its molecular weight of 615.85 and boiling point of 250°C give very low volatility, which helps to limit silane loss during high-temperature compounding. The isocyanurate ring also maintains structural integrity at sustained elevated temperatures.
Will Manta S311 stiffen an elastomeric sealant the way aminosilanes can?
S311 has very low basicity, so it improves adhesion without the over-crosslinking and stiffening that traditional aminosilanes can cause. This preserves the flexibility of the final sealant and its high-movement capability.
Which substrates does Manta S311 improve adhesion to?
Difficult-to-bond substrates including unprimed plastics, glass, aluminum and steel. It is also compatible with a wide range of hot melt resins and moisture-curable prepolymers.
How is Manta S311 supplied and stored?
It is supplied in 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.
Related Products
S311 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.
- End Cappers
- MS, STPE & SPUR Polymers
- Adhesion Promoters
- Water Scavengers
- Crosslinkers
- Catalysts
Looking for a different purity, functional group, or a structure not listed here? Contact our technical team.
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