The Elcometer 5100 Payne Permeability Cups are made of anodised aluminium and are used to determine the permeability of films of paints, varnish, plastic, cellophane, etc.
Elcometer 5100 Payne Permeability Cup
The water evaporates or is absorbed by the cups and, after a certain time, the weight change relative to the film thickness is calculated, indicating the degree of permeability or permeance.