Elcometer 5100 Payne Permeability Cups
Instrument made entirely of anodised aluminium, used to determine the permeability of films of paint, varnish, plastic, cellophane, etc.
The film is gripped between a ring fitted with a seal and the cup, which contains a quantity of water.
The water evaporates and after a certain time the weight loss relative to the film thickness is calculated, indicating the degree of permeability.
