Chemical structure of Silane-terminated polyether (Manta MS3303H)

High Elongation MS Polymer MS3303H

Manta MS3303H is an alkoxysilane-terminated polyether (STPE) with high activity and medium modulus, used as a base polymer for moisture-curing sealants, adhesives, potting compounds and coatings in construction, transportation and industrial assembly. It is solvent-free, contains no free isocyanates and can be formulated with tin-free catalysts.

Grade: MS3303H
Chemical Name: Silane-terminated polyether
Form: Transparent viscous liquid

Overview

Manta MS3303H is an alkoxysilane-terminated polyether (STPE, also known as silane-modified polymer, SMP) with a polypropylene oxide (PPO) backbone. Its silane end groups crosslink rapidly on exposure to humidity and form a siloxane network. It cures at room temperature with atmospheric moisture, typically with amine- or tin-based catalysts, and can be formulated as 1K or 2K systems.

MS3303H is solvent-free, suitable for low-VOC formulations and contains no free isocyanates. Formulations cure without bubbles and with low odor, giving a smooth surface. It is used as a binder in construction, transportation and industrial assembly; new energy applications are subject to testing.

With a viscosity of 50,000 – 60,000 mPa·s at 25 °C, MS3303H is more viscous than Manta MS3303M (40,000 – 50,000 mPa·s at 25 °C), which has the same high activity and medium modulus. Manta MS330B has medium activity, a medium-high modulus and a viscosity of 60,000 – 70,000 mPa·s at 25 °C.

Key Features

High activity with medium modulus
Fast tack-free time and through-cure for efficient production
High transparency with good resistance to UV aging and yellowing
High bond strength with good tensile elasticity and recovery
Solvent-free, low odor and suitable for low-VOC formulations
Tin-free catalysts can be used
Good resistance to water and chemical solvents and good storage stability
Can be blended with other Manta polymers or compatible resins to adjust mechanical properties and formulation cost

Cross-Reference

Performance similar to Kaneka SAX510.

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Specifications

Typical properties of Manta MS3303H
Property	Typical Value
Appearance	Transparent viscous liquid
Flash Point	≥ 100 °C
Viscosity (25 °C)	50,000 – 60,000 mPa·s
Density (25 °C)	1.002 – 1.005 g/cm³
Tack-Free Time	30 min
Tensile Strength	≥ 1.95 MPa
Elongation at Break	≥ 300 %
Hardness (Shore A)	≥ 38
pH Value	6 – 9
Activity	High
Modulus	Medium

Typical values from the current Technical Data Sheet.

Applications

Sealants for transportation
Medium- to low-modulus construction sealants
Clear potting and encapsulation adhesives
Consumer and DIY sealants
Low-emission interior decoration sealants

Processing

Moisture sensitivity: the alkoxysilane end groups of MS3303H hydrolyze and crosslink on contact with water or atmospheric moisture. Store the polymer in tightly sealed containers and process it under moisture-controlled conditions to avoid premature gelation.
Fillers: MS3303H can be compounded with common fillers such as precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), fumed silica, quartz flour, diatomaceous earth and aluminum hydroxide. The polymer content can be adjusted to the required properties.
Drying: dry all fillers thoroughly before compounding. Vinyltrimethoxysilane (VTMO) is recommended as a water scavenger.
Plasticizers: suitable plasticizers include phthalates (e.g., DINP, DIDP), DOTP and low-molecular-weight polyethers (PPG).
Additives: adhesion promoters, antioxidants, fungicides and UV/light stabilizers can be added to adjust the end-use properties.
Catalysts: tin-free catalysts can be used for applications with stricter environmental requirements.

Related applications: Adhesives & Sealants

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

When should I choose MS3303H over other Manta MS polymers?

Choose MS3303H when the formulation needs high activity and medium modulus at a viscosity of 50,000 – 60,000 mPa·s at 25 °C. Its listed cured properties are tensile strength of ≥ 1.95 MPa, elongation at break of ≥ 300 % and Shore A hardness of ≥ 38. For a lower viscosity with the same activity and modulus, consider Manta MS3303M; for a medium-high modulus, see Manta MS3310.

Which catalysts cure MS3303H, and can it be tin-free?

MS3303H cures at room temperature with atmospheric moisture, typically with amine- or tin-based catalyst systems, and tin-free catalysts can be used. It can be formulated as a one-component (1K) or two-component (2K) system.

Which fillers can be compounded with MS3303H?

PCC, GCC, fumed silica, quartz flour, diatomaceous earth and aluminum hydroxide can be used. Dry all fillers thoroughly before compounding to avoid premature gelation; vinyltrimethoxysilane (Manta V31) is recommended as a water scavenger.

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

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