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Mineral wool boards, an end use for a silicone hydrophobing emulsion (Manta WS513)
Silicone Emulsions & Fluids

Silicone Hydrophobizing Additive for Insulation | Manta WS513

Manta WS513 is a solvent-free aqueous emulsion of functional polysiloxanes, designed as a mass hydrophobic additive for phenolic resin binders in the insulation industry. Added directly to the binder mix, it gives rock wool, glass wool and other mineral-fiber insulation water repellency while maintaining water vapor permeability in the fiber network.

Grade
WS513
Chemical Name
Functional polysiloxane aqueous emulsion
Form
Milky white liquid
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Overview

Manta WS513 is an aqueous emulsion of functional polysiloxanes, with an active content of approx. 50%, developed as a dedicated water-repellent additive for the industrial manufacture of bonded mineral wool products. It is incorporated into the phenolic resin binder during production.

WS513 gives finished insulation durable water repellency while maintaining water vapor permeability within the mineral fiber network. It can be added directly into the formulated binder under continuous, gentle agitation, without complex emulsification steps. It is compatible with most standard phenolic resin binders, but a compatibility test with the specific binder mix is required in each plant.

Compared with Manta WS136, also a functional polysiloxane emulsion, WS513 is intended for phenolic resin binders in mineral fiber insulation, while WS136 is intended for waterborne paints, masonry coatings and stucco.

Key Features

  • Mass hydrophobic additive for phenolic resin binders
  • Durable water repellency in finished insulation materials
  • Maintains water vapor permeability in the mineral fiber network
  • Compatible with most standard phenolic resin binders; plant-level compatibility test required
  • Added directly to the binder mix without complex emulsification steps
  • Solvent-free aqueous emulsion

Cross-Reference

Manta WS513 can be considered as an alternative to Wacker SILRES BS 5137.

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

Specifications

Typical properties of Manta WS513
PropertyTypical Value
AppearanceMilky white liquid
Active Content (%)approx. 50
Density (20°C, g/cm³)approx. 1

Typical values from the current Technical Data Sheet.

Applications

  • Rock wool: stone wool insulation boards and rolls
  • Glass wool: glass wool insulation products
  • Other mineral fiber products: acoustic and thermal insulation materials based on mineral fiber

Application Method

  • Mixing Procedure: Manta WS513 should be added directly into the formulated phenolic resin binder under continuous, gentle agitation.
  • Recommended Dosage: The optimal addition rate is between 0.5% and 1.0% by weight, calculated strictly relative to the total mass of the phenolic resin binder.

Related applications: Concrete, Masonry & Stone Protection

Packaging & Storage

Supplied in 20-25 kg plastic drum, 180-200 kg iron drum.

Safety and Storage

Temperature Sensitivity: Manta WS513 is an aqueous emulsion sensitive to extreme temperatures. It must be stored indoors and strictly protected from frost and excessive heat.

Storage Range: Storage temperatures must be maintained between 5°C and 40°C. Exposure to temperatures outside this range may cause irreversible emulsion breakage (phase separation).

Quality Verification: In the event of suspected frost or heat damage, the viability and homogeneity of the product must be thoroughly verified prior to application.

Shelf Life: 12 months when stored properly in original, unopened containers. It’s a non-hazardous substance for transport.

Documents

Frequently Asked Questions

How is Manta WS513 dosed into a phenolic resin binder?

The optimal addition rate is between 0.5% and 1.0% by weight, calculated relative to the total mass of the phenolic resin binder. Add WS513 directly into the formulated binder under continuous, gentle agitation; no complex emulsification steps are required.

Which insulation products is WS513 intended for?

WS513 is a dedicated water-repellent additive for bonded mineral wool manufacturing: rock wool (stone wool) boards and rolls, glass wool products, and other mineral-fiber acoustic and thermal insulation materials.

Can I test WS513 with my own binder before ordering?

Yes, and a compatibility test with the specific binder mix is required in each plant. Samples are charged. The sample fee includes courier delivery and is deducted from your first formal order. Use Request a Sample and state the binder type and the quantity needed.

Looking for a different purity, functional group, or a structure not listed here? Contact our technical team.

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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