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Paints and Inks Solutions

Dow Corning®
87 Additive and
Dow Corning®
88 Additive

Power Up Decorative
Coating Formulations with
Improved Water Resistance

 

High-Performance Additives for Improved Water Resistance in Decorative Coatings

Do you want to increase the water resistance of your wood,
masonry and other porous decorative coating formulations,
but haven’t yet because of the high addition levels required
for currently available silicone products? Dow Corning® 87
Additive and Dow Corning® 88 Additive can help.

Dow Corning 87 and 88 Additives allow you to power up
your decorative coating formulations by providing improved
water resistance at addition levels as low as 2%. In addition,
both additives are solvent free and APEO-free and only
contribute <10 g/l VOCs to final paint formulations, even
when used up to 5% by weight.

The additives improve water resistance by creating a
hydrophobic silicone network in the paint that repels
water but is permeable to water vapor coming from the
substrate. As a result, water penetration is reduced while
cracking and blistering are minimized.



Dow Corning 87 Additive is a milky white silicone resin emulsion with low VOC contribution levels. It is designed for use in waterborne paints. Dow Corning 88 Additive is a silane/siloxane blend with a VOC content of 73 g/l. It is effective at improving water resistance both in acrylic emulsion paints containing polar solvents and in solvent-based systems.

Advantages of Dow Corning 87 and 88 Additives:

  • Solvent-free and APEO-free
  • Contribute <10 g/l VOCs when used at up to 5% by weight
  • Reduce water absorption at only 2% addition by weight
  • Negligible impact on water permeability, even at 5% addition by weight
  • Increased contact angle for better water beading with Dow Corning 87 Additive
  • Maintain paintable surfaces when used at up to 5% by weight
  • Effective in waterborne acrylic and solvent-based decorative paints


Performance at Additive Levels: Reduced Water Absorption

Water absorption (W24) through a paint film is measured as a function of time. The lower the water absorption of a coating, the more water resistance the film offers and the greater protection it provides. Even at only 2% addition by weight, Dow Corning 87 and 88 Additives provide reduced water absorption.

With Dow Corning 88 Additive, addition at 5% shows even further reduction in water absorption, while a competitor silicone resin provides no additional protection when the addition level is increased from 5% to 10%.

Figure 1: W24 of an acrylic-based emulsion paint with and without
Dow Corning® 87 (A) and 88 (B) Additives and vs. a competitor silicone
resin emulsion.

Dow Corning® 87 and 88 Additives provide reduced water absorption in acrylic emulsion paints


The Best of Both Worlds: Excellent Water Vapor Permeability

While Dow Corning 87 and 88 Additives reduce water absorption, they still allow water vapor coming from the substrate to pass through the silicone network, preventing the cracking and blistering that can be a problem with some decorative coatings. Water vapor permeability is reported as the Sd value and is a function of the water vapor transmission rate.

Even in a high-PVC paint formulation that has excellent water vapor permeability, both
Dow Corning 87 Additive and Dow Corning 88 Additive have only a minimal impact on the Sd value when used at a high addition level (Figure 2).

Figure 2:Sd of water of a high-PVC paint formulation with and without Dow Corning® 87 (A) and 88 (B) Additives.
Dow Corning® 87 and 88 Additives have minimal impact on the water vapor permeability of acrylic emulsion paints


Seeing is Believing: Visual Results Underscore Real Performance

Consumers often feel more comfortable with a product when they have visual confirmation of its performance. When it comes to water resistance, they want to see water beading on the coated surface. Better water beading is reflected in a higher contact angle of water on a paint film.
Dow Corning 87 Additive shows a marked increase in contact angles in acrylic resin formulations, even at a low addition level of 2%, and clearly outperforms a competitor emulsion resin.

Figure 3: W24 of an acrylic-based emulsion paint with and without
Dow Corning® 87 (A) and 88 (B) Additives and vs. a competitor silicone
resin emulsion.

Dow Corning® 87 Additive improves the contact angle of acrylic emulsion paints


For More Information

To learn more about these products, download the
Dow Corning 87 Additive and Dow Corning 88 Additive Information Sheet.

Learn more

Interactive Additive Selection Guide

Dow Corning® 87 Additive and
Dow Corning®  88 Additive Information Sheet
 (PDF)

Order a sample of Dow Corning 87 Additive or Dow Corning 88 Additive

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