MS Polymer Type STPE
Low-Modulus STP Polymer | Manta MS201S
Manta MS201S is a silyl-terminated polyether (STPE) with high activity and low modulus, used as a binder for moisture-curing elastic sealants, structural adhesives and protective coatings in construction, transportation and interior decoration. It adheres to many substrates without primer and can be formulated solvent-free and isocyanate-free.
- Grade
- MS201S
- Chemical Name
- Silyl-terminated polyether (STPE)
- Form
- Transparent to slightly yellow viscous liquid
Overview
Manta MS201S is a silyl-terminated polyether with moisture-reactive silyl end groups, designed for moisture-curing systems. It serves as the base polymer for elastic sealants, structural adhesives, encapsulants and protective coatings, and can be formulated as a one-component (1K) or two-component (2K) system.
Unlike conventional polyurethane and silicone systems, formulations based on MS201S can be solvent-free and isocyanate-free. Curing proceeds without bubbles and with low odor, which improves working conditions, and the polymer adheres to many substrates without primer.
MS201S shares the high-activity, low-modulus profile of Manta MS27 and is the lower-viscosity of the two: 18,000 – 28,000 mPa·s at 25 °C compared with 28,000 – 38,000 mPa·s at 25 °C. It can also be blended with other polymers for customized formulations.
Key Features
- High reactivity with low modulus for flexibility and stress relaxation
- Reliable adhesion to a wide range of substrates
- Fast curing; compatible with tin-free catalysts
- Good resistance to weathering and yellowing in outdoor use
- Good resistance to water and chemical attack
- High elastic recovery after repeated stress and movement
- Good shelf-life stability
- Solvent-free and low odor; suitable for low-VOC formulations
- Can be blended with other polymers for customized formulations
Cross-Reference
Performance similar to Kaneka S327.
Trademarks are the property of their respective owners; no affiliation is implied.
Specifications
| Property | Typical Value |
|---|---|
| Appearance | Transparent to slightly yellow viscous liquid |
| Viscosity (25 °C) | 18,000 – 28,000 mPa·s |
| Boiling Point | > 250 °C |
| Density (25 °C) | approx. 1.0 g/cm³ |
| Flash Point | ≥ 237 °C |
| Water Solubility | Practically insoluble |
| Activity | High |
| Modulus | Low |
Typical values from the current Technical Data Sheet.
Applications
- Construction: low-modulus expansion joint and facade sealants
- Transportation: elastic bonding and sealing for rail vehicles, automotive and specialty vehicles
- Consumer and DIY: easy-to-use DIY sealants
- Interior decoration: solvent-free, low-odor decoration sealants
Processing
Manta MS201S is readily soluble in common organic solvents (e.g., ethanol) and practically insoluble in water; all formulation components, including plasticizers and additives, should therefore be oil-soluble.
Curing mechanism: the terminal silane groups cure in two steps:
- Hydrolysis: reaction with atmospheric moisture forms reactive silanol groups.
- Condensation: catalyst-accelerated condensation of the silanol groups forms siloxane (Si–O–Si) bonds and a three-dimensional network.
Moisture control: without catalyst the polymer is stable in air for a limited time, but humidity must be controlled. Dry all raw materials and use a chemical moisture scavenger such as vinyltrimethoxysilane (VTMO) to prevent premature gelation and ensure shelf life.
Equipment: conventional mixers (e.g., planetary mixers) can be used. Please contact Manta technical service for formulation support.
Cleaning
Uncured material can be removed with common organic solvents such as ethanol or dimethyl carbonate (DMC). Cured material can only be removed mechanically.
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: 12 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
Which sealant types benefit from the low modulus of MS201S?
MS201S is designed for flexibility and stress relaxation, which suits low-modulus expansion joint and facade sealants in construction, as well as elastic bonding and sealing for rail vehicles, automotive and specialty vehicles. It can be formulated into both 1K and 2K moisture-curing systems.
When would a formulator pick MS201S instead of MS27?
MS201S shares the high-activity, low-modulus profile of MS27 but has a lower viscosity: 18,000 – 28,000 mPa·s at 25 °C versus 28,000 – 38,000 mPa·s at 25 °C for MS27. Choose MS201S when easier flow during compounding is preferred at the same modulus class.
What kind of plasticizers and additives work in MS201S formulations?
MS201S is readily soluble in common organic solvents such as ethanol and practically insoluble in water, so plasticizers and additives should be oil-soluble. Dry all raw materials and use a chemical moisture scavenger such as vinyltrimethoxysilane (Manta V31) to help limit premature gelation and maintain shelf life.
Can Manta MS201S be cured with tin-free catalysts?
Yes. MS201S is compatible with tin-free catalysts. Its terminal silane groups hydrolyze with atmospheric moisture to form silanols, and catalyst-accelerated condensation then builds the siloxane network, so the catalyst system can be chosen to suit the target cure speed. Confirm the cure profile in your own formulation.
Related Products
MS201S 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
![Chemical structure of [(Methylcarbamato)methyl]dimethoxymethylsilane (Manta AM121)](/images/products/manta-am121-methylcarbamatomethyl-methyldimethoxysilane-chemical-structure.webp)
Need a finished adhesive or sealant rather than the polymer? See our custom MS adhesives and sealants service.
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