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ISO 12944 Coating System

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What is ISO 12944?

ISO12944 is the industry standard for corrosion protection of steel structures by protective paint systems. Originally released in 1998, the standard is put together by representatives from key countries and companies involved in the protection of steel structures to build a mutually beneficial standard.

The standard is designed to provide guidance to architects, engineers, specifiers, applicators and other parties in the application of coatings to steel.

The standard covers 9 parts with key components of the standard covering environment classification, protective paint systems, laboratory test methods and systems and test methods for offshore structures

《 ISO 12944-2017》
What has changed in the 2017 edition of the standard ?

1.Changes to corrosion categories

Category Corrosivity 12944:1998 12944:2018
C1 Very Low Heated buildings Dry or cold with very low pollution
C2 Low Low levels of pollution Temperate low pollution
C3 Medium Urban and industrial atmos pheres, moderate pollution or low salinity Temperate, medium pollution, tropical low pollution
C4 High Industrial areas or coastal areas with moderate salinity Temperate with high pollution,tropical with moderate pollution
C5-I Very High Industrial, high humidity, aggressive atmosphere N/A
C5-M Very High Coastal and offshore areas with high salinity N/A
CX Extreme N/A Extreme industrial areas, offshore areas, salt spray
IM1 Fresh water River installations and hydro plants River installations and hydro plants
IM2 Sea or brackish water Harbour areas with structures and offshore structures Immersed structures without cathodic protection
IM3 Soil Buried structures Buried structures
IM4 Sea or brackish water with cathodic protection N/A Immersed structures with cathodic protection
Note: The old C5-I and C5-M categories have been replaced with C5 for harsh onshore categories and by CX for offshore categories. CX is taken care of in a new Part 9. There is also the addition of a fourth immersion category, IM4, which covers immersed structures in sea or brackish water which are protected by cathodic protection

2.Changes to durability categories

Durability Category 12944:1998 12944:2018
Low (L) 2-5 years Up to 7 years
Medium (M) 5-15 years 7-15 years
High (H) More than 15 years 15-25 years
Very High (VH) N/A More than 25 years
Note: The low, medium and high categories remain but they are joined by very high. The durations which these categories relate to have also changed with low durability now up to 7 years and the new very high category relating to 25 years plus

3.Changes to coating systems

The dry film thicknesses and paint systems now include minimum number of coats per coating type or technology and specify a minimum dry film thickness for the total system per corrosion category. See the coatings systems on page 5 or 6 to see which systems to specify. The standard now also includes the capacity to accept new innovative coating technologies if performance can be demonstrated by 3rd party testing and field trials

4.Changes to laboratory test methods

Category Low (<7 yrs) Med (7-15 yrs) High (15-25 yrs) Very High (25+ yrs)
C2 Non-cyclic Testing Durations as 1998(E) revision ISO 6270 / ISO 9227 Non-cyclic Testing:
Linear Durations TBC ISO 6270 / ISO 9227
C3
C4 As C5 High. Phased cyclic testing: 10 cycles
C5 Non-cyclic Testing Durations as 1998 Phased introduction of ISO 12944-9 Cyclic Testing: 10 cycles Non-cyclic Testing valid for 5 years Immediate introduction of
Cyclic Testing: 16 Cycles
ISO 12944-9
Note: Up to C4 high the test methods have not changed. However for C4 very high, C5 high and C5 very high, cyclic testing has been introduced to better replicate in-field conditions.

ISO 12944 Standard 2018 Edition is one of the most widely used and accepted standards in the steel structure coating protection industry. A large number of steel structures are designed with coating systems based on this standard, and it has been proven to be highly effective. This standard has undergone a complete update, with significant changes in several important definitions, film thickness design parameters, testing method requirements, etc. Mengneng Technology provides a discussion on some of the changes in certain chapters for reference by professionals involved in coatings and painting.

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