Do you still have questions about SILRES® WH?

Here, you can find quick answers to the most common questions and the right contacts for any further information.

Dilute SILRES® WH with water in a ratio of 1:4 to 1:9 and apply it directly to the wood. Up to a concentration of 3%, SILRES® WH can also be added undiluted to water-borne wood stain.

Wood that has been treated with SILRE WH can generally be painted, provided that the treatment has been allowed enough time to dry thoroughly. Note: smooth wood surfaces only absorb some of the silicone, while the rest remains on the surface. This can impair the bonding strength and flow of coatings, particularly with highly concentrated wood preservatives. SILRES® WH should therefore not be used as a primer.

Yes. However, the effect becomes increasingly more visible after the silicone-resin network has developed completely (after about two weeks). Then, however, the beading of SILRES® is maintained for an extremely long time.

No. SILRES® WH does not prevent graying, since this is caused by UV radiation, and silicones transmit UV. However, SILRES® WH promotes even graying.

SILRES® WH has been tested for compatibility with various acrylic resins. So far, no incompatibility has been found. The dry film has a cloudy appearance, which is typical when organic resins are combined with silicones.

Pigmented wood coatings or wood stains can be readily mixed with SILRES® WH in a concentration of 1 - 3 %.

Trials performed on spruce suggested an approximate application quantity of 100 g/m2 with a dilution of 1:9. However, the actual consumption is strongly dependent on the absorption behavior of the treated wood.

Yes, in principle - a dilution of 1:4 to 1:9 ought to protect the wood, however SILRES® WH is not explicitly certified for this purpose.

There are no figures for this. But since SILRES® WH is a water-based product, it can be expected that the penetration depth will be reduced / restricted if the moisture content is too high.

The penetration depth depends strongly on the wood type and density, as well as on the natural resin content. The penetration depth is also influenced strongly by the type of application - against / with the grain.

We tested SILRES® WH as such (not in combination with other agents). The tests focused on the durability under weathering. Free weathering showed a very pronounced beading and low water absorption after 17 years’ outdoor weathering. Actually, we work mainly with the QUV-B chamber and observed the same effect (the weathered wood strips on our ECS demo kit have been treated in this way).

So far, we use UV-B light with a frequency of 280 to 315 nm. The main frequency is 313 nm. In the future we will also perform UV-A irradiation at 315 - 380 nm with a main frequency of 340 nm.

Since SILRES® WH permits the wood to breath effectively, it does not entirely prevent the expansion and shrinkage of the wood. Since silicone resin is flexible, however, it does not peel off as the wood “moves.” In addition, the silicone resin reduces the water absorption, reducing the expansion and shrinkage. This has a positive effect on the cracking behavior.

We applied both dilutions to the test piece. With the 1:9 ratio, the visible beading was somewhat better.

In tests on spruce, oak, beech and ash with a dilution of 1:9, there was no visible effect on the appearance or in some cases a slight darkening.

So far, no tests have been performed, but we will investigate the fire performance in the lab. However, silicone resins are generally very fire resistant. They are therefore used, for example, in binders in heat-resistant coatings. There has already been positive feedback regarding the use of SILRES® WH in insulating coatings for wood.

SILRES® WH should only be used in water-based coatings, since it is an emulsion. But we are already working on products suitable for use in solvents.

Yes – since SILRES® WH has extremely high durability and is not degraded by weathering, we can consider it a very good alternative to waxes.

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