Head of Physical Testing - Packaging
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Enamel rating is a standard industry test that checks the integrity of protective lacquer/enamel on metal packaging.
A can is filled with conductive electrolyte then a small voltage is passed between a test probe immersed in the electrolyte and contacts touching the metal of the can. The value of the resulting current flow indicates the degree of metal exposure or porosity in the coating.
Smithers is able to test flexible aluminium tubes in accordance with BS EN 15384-1 using a sodium chloride electrolyte solution.
The saline solution may be substituted with a copper sulphate solution; a visual indication is then provided by the deposition of copper deposits if the coating is not continuous.