This document specifies the performance requirements for protective paint systems for offshore and
related structures (i.e. those exposed to the marine atmosphere, as well as those immersed in sea or
brackish water). Such structures are exposed to environments of corrosivity category CX (offshore) and
immersion category Im4 as defined in ISO 12944-2.
This part of ISO 12944 describes paint systems for high durability according to ISO 12944-1.
This document is applicable to structures made of carbon steel and does not cover Cd/Bi Cr and Zn/Bi
Cr surfaces. It is not applicable to surfaces under insulation or concrete.
This document is applicable for paint systems intended for a service temperature range between −20 °C
and +80 °C, and the performance testing is aimed at verifying suitability of the paint systems for this
This document is applicable for paint systems for submerged service (Im4) which are intended for
ambient operating temperatures up to a maximum of 50 °C.
This document specifies:
— the test methods to be used to determine the composition of the separate components of the
protective paint system;
— the laboratory performance test methods for the assessment of the likely durability of the protective
— the criteria to be used to evaluate the results of performance tests.
This document covers the requirements for new work and any repairs necessary before start-up. It can
also be used in relation to maintenance where complete refurbishment is carried out and the underlying
metal substrate is completely exposed by abrasive blast-cleaning.
It does not address maintenance in general where methods of surface preparation other than abrasive
blast-cleaning are typically used.
This document deals with structures, made of carbon steel of not less than 3 mm thickness, which are
designed using an approved strength calculation.
The following are not covered by this document:
— structures built of stainless steel as well as those built of copper, titanium or aluminium or their alloys;
— steel cables;
— buried structures;
— the interiors of storage tanks.