Better Buildings with VINNAPAS ® - Wacker Chemie AG


Better Buildings with VINNAPAS®

If the mortar is modified with VINNAPAS® dispersible polymer powder, it can also be used in the thin-bed method – ideal for state-of-the-art construction materials.

As the mortar hardens, elastic polymer bridges form between the brittle mineral components. This greatly improves the mortar’s adhesion to a wide range of substrates. And since an ideal bond can now be achieved with a layer merely three millimeters thick, the mortar costs are also reduced. “The customer can do the same job with 60 to 70 percent less material,” Dr. Pillay explains.

To advise customers locally and tailor its products to particular market needs and applications, WACKER has built up application service centers around the globe – including in Greater Mumbai. At the technical center there, Dr. Pillay and her team deal with all the issues surrounding mortar applications.

“Factory-made dry-mix mortars are inherently less error-prone. They only have to be mixed with water.”

Dr. Priti Pillay Senior Technical Manager, WACKER Mumbai

Flexible Rather than Brittle

Dr. Priti Pillay during a product test at the Mumbai technical center: together with her team, the chemist tackles all manner of issues relating to mortar applications.

Up to two percent VINNAPAS® in the mortar is usually enough to form a stable bond between the AAC blocks. The polymers impart flexibility to the rather brittle mortar, enabling the hardened construction material to more readily accommodate stresses. That prevents cracks in the masonry and makes the building fabric more stable overall. Modified dry-mix mortars also exhibit better water retention. This makes them easier to process and they do not dry out so quickly. “On site, the bricklayers have five to ten minutes in which to position the blocks correctly. If they make a mistake, they can easily correct it,” she says. The slow hardening process also improves the mechanical properties – the material can thus withstand loads better and is more abrasion resistant.