Resource-saving silicone sealant for natural stone applications

ELASTOSIL® eco 7770 P is a one-component formulated, almost odorless compound that cures to a low-modulus elastomer with high elastic recovery when exposed to air humidity. Alcohol is split off by the condensation reaction during cross-linking. The sealant adheres to almost all materials commonly used in the construction industry and does not require primed surfaces. The product is weather resistant, equally suitable for indoor and outdoor applications, and can also be used on marble, metals, and other sensitive surfaces.

WACKER applied a distinctive formulation concept in the manufacturing of ELASTOSIL® eco 7770 P. Based on a special non-volatile silicone softener, it is formulated such that it cannot penetrate the pores of natural stone like marble, granite or sandstone. This means that the natural stone substrates adjacent to the joint are not hydrophobized. The natural stone remains spot- and flawless.

The sealant formulation also contains a patented silane-based cross-linking system that results in a modified surface structure. The cured product has a smooth surface to which no mold can adhere. As a result, the use of fungicides can be limited to around one hundredth of the amount normally used in standard sanitary sealants.

With the crosslinking system and the special plasticizer, WACKER also ensures that only very small quantities of volatile compounds can escape from the sealant during application. Due to its extremely low emissions, which mark the limit of what is technically feasible, the new sealant has been awarded EC 1 plus classification in the EMICODE classification system of the Association for the Control of Emissions in Products for Flooring Installation (GEV).

WACKER uses biomethanol in the formulation of ELASTOSIL® eco 7770 P. In addition, all fossil raw materials used in production are 100 percent offset by sustainably certified biomass. The new silicone sealant is certified in accordance with the REDcert² standard, which ensures traceability throughout the entire manufacturing process – from the manufacture of upstream products to the ready-to-use sealant.

The WACKER booth at the European Coatings Show 2025 from March 25 to 27 is located at Hall 1, Booth 1-206.