European Coatings Show 2015: WACKER Is Presenting a New Silicone Resin for Water-Repellent Wood Coatings and Binders for Dirt- and Weather-Resistant Exterior Paints

Munich – The Munich-based WACKER Group is presenting new binders and additives for the paint and surface-coating industries at the European Coatings Show (ECS) in Nuremberg, Germany, from April 21 to 23, 2015. One of the highlights is the new silicone resin emulsion SILRES® WH. The product which is based on a new silicone resin can be used as a hydrophobizing wood impregnating agent or as an additive in wood stains. Wood impregnated with SILRES® WH is protected against damp, moisture and the subsequent damage caused by fungi and insects for an exceedingly long time. WACKER is also showcasing a binder from its new PRIMIS® line for high-value outdoor applications. PRIMIS® AF 1000, the line’s first product, combines organic and inorganic components, enabling the formulation of bright, highly durable, exterior paints with reduced dirt pick-up.

At ECS 2015, WACKER will be premiering a silicone resin emulsion for wood protection coatings. Its superior impregnating effect enables longterm protection against damp, moisture and damage from moisture exposure. Marketed as SILRES® WH, the product is so flexible that it even bonds to wood surfaces and thus retains the hydrophobic, i.e. water- repellent properties typical for silicones for many years. Long-term tests with impregnated wood show that the moisture and damp resistant properties of SILRES® WH are fully intact after 15 years. Silicone resin additives which have been successfully used on mineral substrates for decades can now provide wood with lasting outdoor protection.

The 50 percent emulsion is based on a functional silicone resin and is suitable as a wood impregnant or as an additive for formulating filmforming, pigmented wood stains. Due to its hydrophobic properties, SILRES® WH significantly reduces the water uptake of wood and, as a result, its moisture content. Weathering tests have shown that the silicone resin’s impregnating effect lasts for many years. Thus, wood is better protected against typical damage caused, for example, by fungi, mold and insects or by cracks due to shrinkage and swelling. It is possible to reduce the use of biocides in formulations significantly. In wood stains and coatings, even low amounts of SILRES® WH provide a long-lasting hydrophobic effect.

SILRES® WH produces a visible beading effect on wood surfaces. By providing wood with long-term protection, the product greatly reduces the frequency of renovation and recoating compared with conventional wood preservatives. Best results are achieved when mixing the additive with water in a 1:4 to 1:9 ratio. In water-based stains, a concentration of up to three percent SILRES® WH is sufficient.

Watch our video clip on SILRES® WH at:

Less Dirt and More Color: PRIMIS® AF 1000

A further ECS 2015 highlight is the new PRIMIS® line, comprising binders and additives for advanced, high-value paints and architectural coatings. The new line combines organic and mineral components to deliver a binder with a completely novel property profile. The elastic, acrylic ester-based, organic component performs a binder’s traditional role, offering strong adhesion and cohesion, good mechanical properties and enhanced processability. The solid mineral components, on the other hand, have outstanding protective properties and ensure long-lasting, bright colors and reduced dirt pick-up.

PRIMIS® AF 1000 offers improved scratch and abrasion resistance, optimized thermal conductivity and water-vapor permeability, and simpler and more even processing. Additionally, the dispersion is characterized by excellent film formation, even at low outdoor temperatures, and by its elasticity while its surface exhibits maximum blocking resistance. The mineral components also improve fire performance. The dispersion’s good pigment compatibility and color consistency keep exterior paints bright for longer – extending renovation cycles and, in turn, positively impacting overall costs.

The new PRIMIS® AF 1000 dispersion is ideal for challenging exterior applications and expands WACKER’s extensive portfolio designed for plasters and exterior coatings.

Watch our video clip on PRIMIS® AF 1000 at:

Visit WACKER at the European Coatings Show 2015 in Hall 1, Booth 1-510.

SILRES® WH offers long-term protection against moisture and damp, as the beading effect on impregnated slabs clearly shows. In comparison, untreated slabs absorb water immediately.

By providing long-term protection, SILRES® WH greatly reduces the frequency of renovating and recoating exterior woodwork (photo: Wacker Chemie AG). Lab test on color stability: alternating high and low temperatures, UV light and humidity simulate months of outdoor weathering in a lab environment. Even after 1000 hours, the test panel coated with the new dispersion PRIMIS® AF 1000 formulation (right) is as brightly colored as before, whereas the commercial alternative (left) is showing clear signs of weathering.

For further information, please contact:

Wacker Chemie AG

Media Relations Information

Nadine Baumgartl

Tel. +49 89 6279-1604

Fax +49 89 6279-2604

The company in brief:

WACKER is a globally-active chemical company with some 16,000 employees and annual sales of around €4.48 billion (2013).

WACKER has a global network of 25 production sites, 21 technical competence centers and 52 sales offices.


Silicone fluids, emulsions, rubber and resins; silanes; pyrogenic silicas; thermoplastic silicone elastomers


Polyvinyl acetates and vinyl acetate copolymers in the form of dispersible polymer powders, dispersions, solid resins and solutions used as binders for construction chemicals, paints and coatings, adhesives, plasters, textiles and nonwovens, as well as for polymeric materials based on renewable resources


Biotech products such as cyclodextrins, cysteine and biologics, as well as fine chemicals and PVAc solid resins


Polysilicon for the semiconductor and photovoltaic industries Siltronic

Hyperpure silicon wafers and monocrystals for semiconductor components

Wacker Chemie AG

Hanns-Seidel-Platz 4

81737 München, Germany

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