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High-Reactivity STPE

Tin-Free Alpha MS Polymer | Manta MS313

Manta MS313 is a high-activity silane-terminated polyether (STPE, also known as silane-modified polymer) used as a reactive binder for moisture-curing adhesives, sealants and potting compounds. It cures rapidly on exposure to atmospheric moisture to a tough, elastic siloxane-crosslinked network and can be used in tin-free formulations.

Grade
MS313
Chemical Name
Silane-terminated polyether (high-reactivity type)
Form
Colorless, transparent viscous liquid

Overview

Manta MS313 is a silane-terminated polyether for moisture-curing adhesives and sealants, also used as an additive in coatings. It cures rapidly on exposure to atmospheric moisture to a tough, elastic siloxane-crosslinked network.

Its reactivity allows fast curing without organotin catalysts, which makes MS313 an alternative to conventional polyurethane and silicone systems where tin-free formulations are required. The moderate viscosity gives broad formulation latitude and allows compounding with high filler loadings, and the modulus can be adjusted over a wide range by formulation.

MS313 and Manta MS310A are both high-activity polymers that allow tin-free formulations. MS313 has the higher viscosity of the two, 30,000 – 42,000 mPa·s at 25 °C compared with 8,000 – 12,000 mPa·s at 25 °C, and its data sheet includes a starting formulation for a crystal-clear sealant.

Key Features

  • High reactivity with fast curing and a short tack-free time
  • Allows tin-free and plasticizer-free adhesives
  • Moderate viscosity for broad formulation latitude and high filler loadings
  • High tensile strength and high elasticity; modulus adjustable by formulation
  • Good shelf-life stability in properly sealed formulations
  • Bonds to a variety of substrates without primer; confirm adhesion on the actual substrate

Cross-Reference

Manta MS313 can be considered as an alternative to Wacker GENIOSIL STP-E30.

Trademarks are the property of their respective owners; no affiliation is implied.

Specifications

Typical properties of Manta MS313
PropertyTypical Value
AppearanceColorless, transparent viscous liquid
Viscosity (25 °C)30,000 – 42,000 mPa·s
Density (25 °C)1.005 – 1.006 g/cm³
ActivityHigh

Typical values from the current Technical Data Sheet.

Applications

  • Industrial adhesives: elastic bonding in structural engineering, automotive assembly and transportation where vibration resistance and durability are required
  • Construction sealants: paintable, weather-resistant construction sealants; suitable for low-VOC formulations
  • Transparent adhesives: clear, elastic adhesives
  • Electrical and electronics: can be evaluated as a potting or encapsulation compound for stress relief of components; insulation properties must be verified in the final formulation
  • DIY and assembly: liquid-nail type assembly adhesives with high initial tack and fast strength build-up

Processing

  • Moisture sensitivity: Manta MS313 is highly reactive with moisture. Maintain moisture-free conditions during storage and production to prevent premature gelation.
  • Fillers: compatible with fillers such as PCC, GCC, fumed silica and aluminum hydroxide.
  • Drying: dry fillers before use. Vinyltrimethoxysilane (VTMO) is recommended as a water scavenger during mixing to ensure shelf-life stability.
  • Plasticizers: compatible with plasticizers such as DINP, DIDP and polypropylene glycol (PPG).
  • Additives: adhesion promoters, antioxidants, UV stabilizers and fungicides can be added to adjust the end-use properties.

Starting Formulation: Crystal-Clear Sealant

Component% by Weight
Manta MS31349.50
Plasticizer (PPG)34.00
Water Scavenger (VTMO)2.00
Pyrogenic Silica (HDK® H18)12.00
Stabilizers0.50
Adhesion Promoter (AMMO)2.00

Crystal-Clear Sealant Properties

PropertyTest Condition / MethodResult
Skin-Formation Time (min)23 °C / 50% r.h.40
Tensile Strength at Break (N/mm²)ISO 37 - rod 12
Elongation at Break (%)ISO 37 - rod 1300
Shore A HardnessISO 86835

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

Frequently Asked Questions

How do MS313 and MS310A differ?

Both are high-activity silane-terminated polyethers that allow tin-free formulations. MS313 has a viscosity of 30,000 – 42,000 mPa·s at 25 °C, while MS310A has a lower viscosity of 8,000 – 12,000 mPa·s at 25 °C. MS313 offers high tensile strength and high elasticity with a modulus that can be adjusted over a wide range by formulation.

Is MS313 a good base for liquid-nail assembly adhesives?

Yes. MS313 is used for liquid-nail type assembly adhesives with high initial tack and fast strength build-up, alongside elastic bonding in structural engineering, automotive assembly and transportation.

What precautions keep MS313 stable during production and storage?

MS313 is highly reactive with moisture, so maintain moisture-free conditions during storage and production to help limit premature gelation. Dry fillers before use and add vinyltrimethoxysilane (Manta V31) as a water scavenger during mixing to ensure shelf-life stability.

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.