Chemical structure of Silane-modified polyether (trimethoxysilylpropylcarbamate-terminated) (Manta MS311)

Trimethoxysilyl MS Polymer | Manta MS311

Manta MS311 is an alkoxysilane-terminated polyether (CAS 216597-12-5) with trimethoxysilylpropylcarbamate end groups, high activity and medium-high modulus. It is used as a low-viscosity binder for moisture-curing elastic sealants, elastic structural adhesives, sealing coatings and potting compounds, and suits clear formulations because of its high transparency.

Grade: MS311
Chemical Name: Silane-modified polyether (trimethoxysilylpropylcarbamate-terminated)
CAS No.: 216597-12-5
Form: Colorless, transparent viscous liquid

Overview

Manta MS311 is an alkoxysilane-terminated polyether (STPE, also known as silane-modified polymer, SMP) based on a polypropylene oxide (PPO) backbone with trimethoxysilylpropylcarbamate end groups. On exposure to moisture the end groups hydrolyze and crosslink at room temperature to form a siloxane network.

The polymer is solvent-free and isocyanate-free, has low odor and is suitable for low-VOC formulations. It cures without bubble formation, is highly transparent and adheres to a wide range of substrates; adhesion should be confirmed on the actual substrate. It can be used in one-component and two-component systems.

MS311 shares its end-group chemistry with Manta MS312 and Manta MS330A and is the lowest in viscosity of the three: 4,000 – 5,000 mPa·s at 25 °C, compared with 8,000 – 13,000 mPa·s at 25 °C for MS312 and 25,000 – 35,000 mPa·s at 25 °C for MS330A.

Key Features

Fast room-temperature cure through moisture-reactive alkoxysilane groups
Low viscosity for easy compounding
Colorless and highly transparent, suitable for clear formulations
Good resistance to aging, yellowing, water and chemical solvents in cured formulations
Good bond strength on many common substrates
Solvent-free, isocyanate-free and low odor
Suitable for low-VOC formulations
Good storage stability and compatibility with other polymers

Specifications

Typical properties of Manta MS311
Property	Typical Value
Appearance	Colorless, transparent viscous liquid
Flash Point	> 100 °C
Viscosity (25 °C)	4,000 – 5,000 mPa·s
Density (25 °C)	1.002 – 1.005 g/cm³
Tack-Free Time	30 min
Activity	High
Modulus	Medium-high

Typical values from the current Technical Data Sheet.

Applications

Adhesives and sealants: base polymer for one-component and two-component moisture-curing sealants and elastic adhesives
Elastic structural adhesives: formulations requiring medium-high modulus, high bond strength and durable elasticity
Potting compounds: moisture-curing encapsulation systems for industrial use; can be evaluated for electronic potting, with electrical properties to be verified in the final formulation
Coatings: flexible sealing coatings and protective coatings requiring adhesion, transparency and chemical resistance
Market segments: bonding and sealing in construction, general industry and transportation; new energy applications are subject to testing

Processing

The alkoxysilane groups of Manta MS311 hydrolyze and crosslink on contact with water, so moisture must be excluded during storage and production. Dry fillers before use to avoid premature curing; vinyltrimethoxysilane (VTMO) is commonly used as a water scavenger.

MS311 can be adjusted flexibly in formulations and is compatible with most common fillers, including nano (precipitated) calcium carbonate, ground calcium carbonate, fumed silica, silica powder, diatomaceous earth and aluminum hydroxide. Common plasticizers are phthalates and low-molecular-weight polyethers. Adhesion promoters, antioxidants, fungicides and light stabilizers can be added to adjust the end-use properties.

Related applications: Adhesives & Sealants

Packaging & Storage

200 kg steel drum with aluminum-foil liner bag;

1,000 kg IBC (tote);

Other pack sizes available on request.

Shipped as ordinary chemical goods; refer to the SDS for transport information.

Safety and Storage

Store in the tightly closed original container in a cool, dry place, protected from direct sunlight. Shelf life: 12 months from the date of production when stored as recommended. For handling and disposal, follow standard chemical safety practice and the current Safety Data Sheet (SDS).

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

How does Manta MS311 differ from Manta MS312?

Both carry trimethoxysilylpropylcarbamate end groups and have a medium-high modulus. MS311 has high activity and a viscosity of 4,000 – 5,000 mPa·s at 25 °C, while MS312 has medium activity and a viscosity of 8,000 – 13,000 mPa·s at 25 °C. MS311 is the lower-viscosity option where easy compounding is the priority.

Which fillers and water scavenger are used with Manta MS311?

MS311 is compatible with most common fillers, including nano (precipitated) calcium carbonate, ground calcium carbonate, fumed silica, silica powder, diatomaceous earth and aluminum hydroxide. Dry fillers before use to avoid premature curing; vinyltrimethoxysilane (Manta V31) is commonly used as a water scavenger.

Can I test Manta MS311 before placing an order?

Yes. Samples are charged. The sample fee includes courier delivery and is deducted from your first formal order. Use Request a Sample and state the quantity and your application. The TDS is on this page; SDS and COA are available on request.

Need a finished adhesive or sealant rather than the polymer? See our custom MS adhesives and sealants service.

Talk to our technical team

Tell us your application, target properties and estimated quantity. We will suggest grades and arrange documents or samples.

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