Quality testing

All products are tested every day to check conformity with customers’ specifications.

A series of tests is performed on the finished product every day, to determine:

  • apparent density
  • specific surface
  • sieve testing
  • ZnO content
  • metallic impurities
  • moisture level
  • loss upon calcination
  • solubility in water
  • insolubility in HCl and in triammonium waters

The product is not delivered until all the required tests have been passed.