NF T34-721-3*NF EN 1062-3:2008 Paints and varnishes - Coating materials and coating systems for exterior masonry and concrete - Part 3 : determination of liquid water permeability.
1999NF T34-721-3:1999 Paints and varnishes. Coating materials and coating systems for exterior masonry and contrete. Part 3 : determination and classification of liquid-water transmission rate (permeability).