What is the difference between penetrating and film forming wall sealers?
A. The penetrating sealers based on silane and oligomeric siloxane do not form a film and have very little or no effect on breathability of the substrate, which in some cases may be important, e.g., in damproofing of brick walls. The film forming sealers form a very thin, physical film on the surface. Depending on the formulation and the substrate porosity they may penetrate to some extent or just form a surface film. The film forming sealers, e.g. Gem-Seal MB, Rain-Shield MB WB will reduce breathability to some extent. They are not recommended for brick walls and are used only on concrete or concrete block walls. Back to top Q. What is microsilica and how does it affect the properties of concrete?A. Microsilica is a very fine particle, amorphous silicone dioxide with pozzolanic properties. It reacts with lime generated by hydration of Portland cement and forms additional products of hydration. Condensed silica fume is one of the microsilica types of pozzolans, produced during manufact
