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DOWSIL™ 502W Additive

Silicone wetting agent for waterborne and radiation curable coatings, inks and overprint varnishes.

Benefits:

  • Wide range of products allows choice of exactly the right product for the application, allowing for cost-effective, optimum performance 
  • Consistent wetting performance across a wide range of formulations and over a wide range of substrates 
  • Can be used in both waterborne and UV cured paints, inks and coatings 
  • Improve wetting of difficult substrates, such as wood, plastic and metal 
  • Little or no impact on the coefficient of friction/slip properties 
  • Recoatable 
  • 100% active; low VOC, solvent-free and BTX-free 
  • Effective at low addition levels (recommended 0.1 to 0.4% as supplied, based on total formulation) 
  • Easy-to-use, low viscosity liquids 
  • Enable minimization of raw material portfolio

Dow introduces a family of Superwetter Additives for high-performance water-based and UV cured inks, coatings and overprint varnishes:

  • DOWSIL™ 67 Additive
  • DOWSIL™ 500W Additive
  • DOWSIL™ 501W Additive
  • DOWSIL™ 502W Additive

Do you have difficulty achieving effective substrate wetting with your waterborne or UV cured formulations, particularly on challenging substrates like wood, plastic and metal? Have you tried other silicone additives, only to see undesirable effects on slip properties?

With its range of functionalities and hydrophilicities, the new family of superwetter additives from Dow can be used in waterborne, solventborne and solventless radiation curable coatings. These additives can help you obtain the wetting performance you want for your formulation and substrate – and do so with little or no impact on slip properties.

Making an informed choice of Superwetter

Dow understands that every formulation is different. By providing more information about structure, end capping and hydrophilicity/HLB, Dow seeks to improve the quality of wetting additive choices. All four products in this DOWSIL™ Superwetter family are 100% silicone polyether copolymers and are characterized by being usable in both waterborne and UV coatings formulations, offering recoatability and a high level of consistency across different types of binders.

In addition:

Products Silicone Polyether Copolymer (%) Viscosity (cst) HLB-EO End Cap Surface Tension (aqueous 0.1% solution)
DOWSIL™ 67 Additive 100 31-51 11.5 OH 21.0
DOWSIL™ 500W Additive 100 25.5-29.5 10.7 OAc 22.0
DOWSIL™ 501W Additive 100 10-30 10.6 OMe 20.5
DOWSIL™ 502W Additive 100 49-75 13.2 OH 22.4

Key features of DOWSIL™ 502W Additive

Besides excellent wetting performance at low addition levels, DOWSIL™ 502W Additive can be used when consistent low dynamic surface tensions under shear is required, which could provide benefits in high-speed coatings or printing and spray coatings.

High performance at low use levels

DOWSIL™ 67 Additive, DOWSIL™ 500W Additive, DOWSIL™ 501W Additive and DOWSIL™ 502W Additive provide excellent wetting performance at low addition levels with little or no influence on slip. In a waterborne PUD-based flooring coating, for example, all four additives provide excellent wetting performance versus competitive organic and silicone wetting additives over different substrates. The toolbox approach also enables formulators to choose the right product for a specific application, while at the same time reducing the number of products they must maintain in their raw material portfolios. The superior performance can be measured in multiple waterborne coatings by the surface appearance and coefficient of friction (Figures 1 and 2).

Figure 1: Surface appearance and slip properties of a waterborne, PUD-based wood coating with the addition of DOWSIL™ 67 Additive, DOWSIL™ 500W Additive, DOWSIL™ 501W Additive and DOWSIL™ 502W Additive. Additives were added at 0.2 weight percent in the total formulation.

Graph: Surface appearance and slip properties of a waterborne, PUD-based wood coating with additives added at 0.2 weight percent in the total formulation

Figure 2: Surface appearance and slip properties of a waterborne, acrylic-based wood coating with the addition of DOWSIL™ 67 Additive, DOWSIL™ 500W Additive, DOWSIL™ 501W Additive and DOWSIL™ 502W Additive. Additives were added at 0.2 weight percent in the total formulation.

Graph: Surface appearance and slip properties of a waterborne, acrylic-based wood coating with the addition of additives added at 0.2 weight percent in the total formulation

High performance in high speed applications

DOWSIL™ 502W Additive can be used when consistent low dynamic surface tensions under shear is required, which could provide benefits in high-speed coatings or printing and spray coatings. When the dynamic surface tension is measured using a bubble tensiometer, DOWSIL™ 502W almost maintain its ST even at higher speeds. This gives an indication that DOWSIL™ 502W will be useful for wetting in high speed applications.

Figure 3: Dynamic Surface Tension values for DOWSIL™ additives versus competition as 0.2% by weight aqueous dispersions measured using a bubble tensiometer.

Graph: Dynamic Surface Tension values for  additives versus competition as 0.2% by weight aqueous dispersions measured using a bubble tensiometer
  • SYL-OFF™ 4000 Catalyst
    General purpose catalyst which is compatible with all Syl-off® brand solvent based and solventless release coating systems as well as Plantinum cure silicone PSAs.

  • XIAMETER™ PMX-200 Silicone Fluid 350 cSt
    100% active, 350 cSt, polydimethylsiloxane polymer. INCI Name: Dimethicone

  • DOWSIL™ 7091 Adhesive Sealant
    High performance, neutral cure silicone adhesive/sealant.

  • DOWSIL™ 795 Silicone Building Sealant
    A one-part, cold-applied, non-sagging silicone material that cures to a medium modulus silicone rubber upon exposure to atmospheric moisture.

  • DOWSIL™ 791 Weatherproofing Sealant
    A one-part, medium-modulus, elastomeric sealant designed for general weathersealing. It is a silicone formulation that cures to a flexible and curable silicone rubber building joint seal.

  • XIAMETER™ PMX-0244 Cyclotetrasiloxane

    A volatile methylsiloxane fluid, clear, odorless, VOC-exempt, low toxicity, low surface tension and evaporates completely at room temperature. INCI Name: Cyclotetrasiloxane


  • DOWSIL™ 983 Structural Glazing Sealant Base and Curing Agent

    Designed for specialized use where dual structural and weatherseal applications are desired for factory glazing and curtainwall production. Once cured, this structural sealant forms a durable, flexible, watertight bond that can be warranted for 20 years and used in ±25% movement weatherseal applications. It has excellent unprimed adhesion to glass, alodine, and anodized aluminum1, although DOWSIL™ Primer-C OS is recommended for fast and consistent adhesion, especially to high-performance substrates approved for architectural structural glazing applications.


  • XIAMETER™ PMX-1501 Fluid
    A blend of an ultra high viscosity dimethiconol in cyclopentasiloxane for use in skincare, suncare, haircare, antiperspirant and deodorant, and color cosmetic applications. INCI Name: Cyclopentasiloxane (and) Dimethiconol

  • DOWSIL™ 995 Silicone Structural Sealant
    A one-component, self-priming, shelf-stable, neutral-cure, elastomeric adhesive specifically formulated for silicone structural glazing and exhibits excellent unprimed adhesion to most building substrates. This product has superior unprimed adhesion for structural glazing applications for hurricane or impact rated windows and doors. It has a movement capability of +/- 50%.

  • DOWSIL™ Primer-C OS

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