Historical
BS EN ISO 7783-1:2000
Paints and varnishes. Coating materials and coating systems for exterior masonry and concrete. Determination of water-vapour transmission rate of free films (dish method) (British Standard)
This part of ISO 7783 specifies a method for the determination of the water-vapour transmission rate2) of an unsupported film of paint, varnish or related product. The test method is applicable to the transmission of water vapour in either direction through a paint film.
2) This term is often confused with permeability or permeance, which have distinct definitions (see note 9 in subclause 11 3).
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British Standards Institution [bsi]
British Standards Institution [bsi]