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External Protection System - Zinc Coating

A metallic Zinc layer is applied by thermal metallization process on the DI pipe surface. The metallic Zinc coating is covered by a finishing layer of a bituminous paint or synthetic resin compatible with zinc. The International Standard ISO: 8179-1 establishes the main features of Zinc coating as well as suitable methods for checking them.

Two options of Zinc coating are available, depending on soil aggressiveness -

  • Standard 130 gm/m2 and finishing layer of 70 microns
  • 200 gm/m2 and finishing layer of 70 microns or 100 microns