Extraordinary balance between tensile adhesive strength and flexibility

At Paint Istanbul 2018 (March 22 – 24), WACKER unveiled its flexible VINNAPAS^® 4240 N dispersible polymer powder, which offers an extraordinarily good balance between flexibility and tensile adhesive strength. The powder, which is based on vinyl acetate-ethylene (VAE), is ideal for various wall applications such as adhesive and embedding mortars in external thermal insulation composite systems (ETICS/EIFS) and for finishing plasters.

The high proportion of ethylene in the polymer chain means that VINNAPAS^® 4240 N has a low glass transition temperature and therefore displays good crack-bridging properties and improves the flexibility of mineral mortars. As a result, the product does an excellent job of compensating for the stresses that arise due to temperature fluctuations, weathering, material shrinkage and vibrations. The dispersible polymer powder also features particularly good resistance towards severe impacts, which plays a major role in finishing plasters and in the embedding mortars used in ETICS/EIFS.

In addition, VINNAPAS^® 4240 N positively affects the cohesion of the end product, thereby improving adhesion to inorganic and organic surfaces. This means that, when used for adhesive and embedding mortars in ETICS/EIFS, an extremely strong adhesive bond can be formed between EPS panels and masonry.

VINNAPAS^® 4240 N can also be readily combined with other polymeric binders. When used in the dry component alongside VINNAPAS^® 760 ED (a soft dispersion for two-part waterproofing membranes), VINNAPAS^® 4240 N achieves a very high tensile adhesive strength in the end product without impacting the system’s crack-bridging properties.