Does SILRES ® WH Really Deliver? - Wacker Chemie AG

Does SILRES® WH Really Deliver?

Thomas M. already tested several WACKER products: “I guess I’m just curious about whether our products really deliver on their promises – and I am fairly thorough in this respect. But I also simply enjoy trying out new things.” Mister M. learned about SILRES® WH on the WACKER intranet. As he was about to build a play tower for his children anyway, he put the innovative wood protection to the test – also with the environment in mind: “I did not want to use boiler-pressure impregnated timber, because this method utilizes potentially harmful metal salts that might leach into the soil.”

Immersion Method

For many years of joyful play: SILRES® WH protects wooden constructions that are exposed to the weather.

The WACKER employee built his play tower from untreated Nordic spruce. He coated the wood before construction using a 5% solution, which he applied with a standard paintbrush. “It was bit of a tedious task, because the water-based dilution is quite thin. It would have been easier to just immerse the timber into the dilution. But a splash-free lacquer roller might be a good option, too,” he observes. Nordic spruce has a high density and the timber was planed very smoothly, so the wood did not absorb the dilution very well at first. With the second coating, however, Mister M. achieved a homogenous spread and good saturation. And he is very pleased with the results: “After a few weeks the beading effect was very pronounced, and after two years it is still perfect. SILRES® WH really delivers on the promised performance.”


The silicone resin in SILRES® WH forms a network at molecular level that provides reliable protection from moisture-induced damage, even at the edges and in narrow spaces.

“Right after the treatment the wood was still a little sticky. But only until the silicone resin network was fully hardened,” Mister M. recalls. “So I recommend protecting freshly treated surfaces from possible contaminants like dust or leaves. ”He also recommends carefully covering everything that is not supposed to be treated. Because once the resin is fully dried it is very hard to remove.