Trimethoxysilyl STPE
Trimethoxysilane-Terminated Polyether | Manta MS330A
Manta MS330A is a silane-terminated polyether (CAS 216597-12-5) with trimethoxysilylpropylcarbamate end groups, high reactivity and medium-high modulus, used in moisture-curing elastic sealants and adhesives for automotive, rail, container and construction markets. It is solvent-free and isocyanate-free, cures without bubbles and combines high bond strength with good elastic recovery.
- Grade
- MS330A
- Chemical Name
- Trimethoxysilylpropylcarbamate-terminated polyether (polyether reacted with 3-isocyanatopropyltrimethoxysilane)
- CAS No.
- 216597-12-5
- Form
- Colorless, transparent viscous liquid
Overview
Manta MS330A is a silane-terminated polyether (STPE, also known as silane-modified polymer, SMP) with trimethoxysilylpropylcarbamate end groups on a linear polypropylene oxide (PPO) backbone. It is designed for moisture-curing elastic sealants and adhesives. On exposure to moisture the end groups hydrolyze, releasing methanol, and condense to form a densely crosslinked siloxane network.
MS330A is solvent-free and isocyanate-free, cures with low odor and without bubble formation, and combines high bond strength with good elastic recovery on a wide range of substrates. Its high reactivity gives short tack-free times, and its moderate viscosity allows efficient mixing with standard fillers and additives on standard compounding equipment.
MS330A is listed with the same viscosity (25,000 – 35,000 mPa·s at 25 °C), activity and modulus as Manta MS330C. The MS330A data sheet adds a starting elastic sealant formulation in percent by weight, with skin-formation time, tensile strength, elongation and hardness of the cured sealant. Manta MS312 has the same end groups with medium activity at a lower viscosity of 8,000 – 13,000 mPa·s at 25 °C.
Key Features
- High reactivity for short tack-free times, with medium-high modulus
- Good mechanical strength and high elastic recovery for joints subject to movement
- Solvent-free and isocyanate-free, with no bubbles during crosslinking
- Suitable for low-VOC formulations
- High transparency and good resistance to yellowing for clear sealants and coatings
- Moderate viscosity for efficient mixing with standard fillers and additives
- Good adhesion to many porous and non-porous substrates, often without primer
Cross-Reference
Manta MS330A can be considered as an alternative to Wacker GENIOSIL STP-E35.
Trademarks are the property of their respective owners; no affiliation is implied.
Specifications
| Property | Typical Value |
|---|---|
| Appearance | Colorless, transparent viscous liquid |
| Flash Point | 237 °C |
| Viscosity (25 °C) | 25,000 – 35,000 mPa·s |
| Density (25 °C) | 1.02 – 1.05 g/cm³ |
| Catalyst Dosage (Tin, on polymer) | 1 – 2 % |
| Activity | High |
| Modulus | Medium-high |
Typical values from the current Technical Data Sheet.
Typical Performance of a Reference Sample
| MS330A Test Item | Standard | Result |
| Appearance | Colorless or light yellow, transparent liquid | Colorless, transparent liquid |
| Viscosity (25 °C), mPa·s | 25,000 – 35,000 | 26,880 |
| pH Value | 6 – 9 | 7.0 |
| Tensile Strength, MPa | ≥ 0.5 | 0.77 |
| Elongation at Break, % | ≥ 80 | 109 |
| Hardness, Shore A | ≥ 35 | 36 |
Applications
- Automotive and transportation: elastic sealants for vehicle bodies, rail vehicles and container construction where vibration resistance is required
- Construction: can be formulated into low- to medium-modulus joint sealants for buildings and infrastructure with good weathering resistance
- Transparent products: clear adhesives, for example for decorative glass bonding; can be evaluated for transparent potting compounds for electronic components, with electrical properties to be verified
- Interior decoration: DIY and professional adhesives and sealants for interior use; suitable for low-VOC formulations
- Coatings: flexible protective sealing coatings with good adhesion to metal and plastic surfaces
Processing
Manta MS330A is soluble in common organic solvents and practically insoluble in water. On contact with moisture it hydrolyzes slowly, releasing methanol, and condenses to a siloxane network. Without catalyst the polymer is stable in air for a limited time; it should nevertheless be stored and processed with moisture excluded to prevent slow condensation.
Standard mixing and compounding equipment can be used. A water scavenger is required to obtain adequate shelf life of the formulated product; vinyltrimethoxysilane (VTMO) is recommended to prevent premature gelation during production and storage.
Starting Formulation: Elastic Sealant
| Component | % by Weight | Example / Function |
| Manta MS330A | 25.00 | Silane-terminated polymer (binder) |
| Plasticizer | 25.00 | PPG (alternatives: DINP, DOTP) |
| Water Scavenger | 2.00 | Vinyltrimethoxysilane (VTMO) |
| Filler | 21.80 | Fine coated ground calcium carbonate (GCC) |
| Filler | 21.80 | Ultrafine coated precipitated calcium carbonate (PCC) |
| Thixotropic Agent | 2.00 | Pyrogenic silica (HDK® H18) |
| Stabilizers | 0.20 | Hindered phenols (AO) / HALS (UV) |
| Adhesion Promoter | 1.00 | Amino-silane (AMMO; alternative: AMEO) |
| Catalyst | 0.20 | Dioctyltin dilaurate (alternatives: DBTDL, tin-free catalysts) |
Elastic Sealant Properties
| Property | Test Condition / Method | Result |
| Skin-Formation Time (min) | 23 °C / 50% r.h. | 30 |
| Tensile Strength at Break (N/mm²) | ISO 37 - rod 1 | 2.5 |
| Elongation at Break (%) | ISO 37 - rod 1 | 600 |
| Shore A Hardness | ISO 868 | 35 |
Related applications: Adhesives & Sealants
Related reading: Difference Between MS, STPE, SMP, STPU and SPU
Packaging & Storage
50 kg plastic drum with aluminum-foil liner bag;
200 kg drum with aluminum-foil liner bag;
1,000 kg IBC (tote);
Other pack sizes available on request.
Safety and Storage
Store in the tightly closed original container in a cool, dry place, protected from moisture and direct sunlight. Shelf life: 24 months from the date of production when stored as recommended. The product is classified as non-hazardous. Refer to the current Safety Data Sheet (SDS) for safety, handling and transport information.
Note: The values in this data sheet are typical values and are not intended for use in preparing specifications. Users should test the product to determine its suitability for their specific application.
Documents
- Technical Data Sheet · PDF Download TDS
- SDS and COA · on request Request Documents
Frequently Asked Questions
Is there a guide formulation for sealants based on MS330A?
Yes. The starting formulation on this page combines MS330A with PPG plasticizer (alternatives: DINP, DOTP), vinyltrimethoxysilane as water scavenger, coated GCC and PCC fillers, pyrogenic silica as thixotropic agent, hindered phenol and HALS stabilizers, an amino-silane adhesion promoter and dioctyltin dilaurate catalyst. Percentages by weight and the resulting sealant properties are listed in the same section.
Which catalysts can be used with MS330A?
Tin catalyst dosage is 1 – 2 % on polymer. The starting formulation uses dioctyltin dilaurate, with DBTDL or tin-free catalysts named as alternatives. Confirm the cure profile in your own formulation.
Which water scavengers protect MS330A formulations from gelation?
A water scavenger is required to obtain adequate shelf life of the formulated product. Vinyltrimethoxysilane (VTMO, Manta V31) is recommended to prevent premature gelation during production and storage.
How does MS330A differ from MS330B?
Both have a medium-high modulus. MS330A has high activity and a viscosity of 25,000 – 35,000 mPa·s at 25 °C, while MS330B has medium activity and a viscosity of 60,000 – 70,000 mPa·s at 25 °C. MS330A gives short tack-free times and efficient mixing; the higher base viscosity of MS330B typically reduces the fumed silica needed for thixotropy.
What storage conditions keep MS330A in specification?
Without catalyst MS330A is stable in air for a limited time, so it should be stored and processed with moisture excluded. Store in the tightly closed original container in a cool, dry place, protected from moisture and direct sunlight. Shelf life: 24 months from the date of production when stored as recommended. The product is classified as non-hazardous. Refer to the current Safety Data Sheet (SDS) for safety, handling and transport information.
Related Products
MS330A 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
Manta V31
Vinyl-Functional Silane (VTMO) / Crosslinker & Moisture Scavenger
Manta CAT-DOTDL
Organotin Catalyst & Lubricant (Dioctyltin Dilaurate)
Need a finished adhesive or sealant rather than the polymer? See our custom MS adhesives and sealants service.
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