89395 ⎘
After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone; Coating or impregnating e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements,; Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation Applying layers containing opposite charged particles or materials in the successive layers