Evonik's coating additives business line has introduced Tego Airex 990 and 991, a new generation of deaerators and defoamers for solventborne high solids coatings. These liquid products contain 100 percent active substance, are free of organic solvents and boast good recoatability, which gives the formulator the advantage of setting the solvent content the company said. Tego Airex 990 is a compatible deaerator for clear and pigmented coatings, strengthened by its ability to balance compatibility and effective deaeration. It can be used in all types of spray applications. Tego Airex 991 is a very powerful deaerator for pigmented fillers and top coats. Even at medium to high film build, it shows outstanding performance against microfoam and macrofoam and can be used in many different systems with particular emphasis on airless, airmix and roller application the company said.