ASTM D6490

Full Name

ASTM D6490 – Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious Panels


This test method covers the determination of the rate at which water vapor passes through non film forming treatments, such as silanes, siloxanes and blends of silanes/siloxanes applied to cementitious substrates.

This test method covers the use of the wet cup technique, which most closely approaches the exterior conditions for use for these materials. Other conditions can be used if agreed upon between purchaser and supplier. Agreement should not be expected between results obtained by different methods or test conditions.


permeability; permeance; perms; water vapor permeance; water vapor transmission