4. Valuation methods
The importance of coatings in the final quality of metal packaging has led to the development of numerous testing methods, both for routine production control and for the selection and development of new coatings.
4.1 Physical properties
Film thickness: an essential characteristic of the application, it is traditionally measured by weight (for example, 5 to 7 g/m 2 for a common epoxy-phenolic varnish) or electrically (the varnish is a dielectric whose capacity is a function of thickness).
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Valuation methods
Choice of protection specifications according to content
Economic data
For France, the values are as follows:
— cans for preserves and beverages 7 billion cans/year
— metal used 600,000 tonnes/year
— varnishes and coatings 25,000 tonnes/year
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