Coating Protection For Steel

ISO 12944 Protective coatings for steel structures using ISO 12944 systems

The ISO 12944 standard is designed as a guideline for Architects, Engineers, Specifiers, Contractors and Applicators in formulating corrosion protection systems.

This guide is intended as a basic introduction to ISO 12944 with a choice of approved Complete Coating Services Specifications.

Three easy steps to follow

1. Select Environment

2. Select Durability

3. Select System

1. Select Environment (ISO-12944-2)

Corrosion Environment
(ISO 12944-2)
ExteriorInterior
C1 Very LowHeated buildings with clean atmosphere, e.g. offices, shops, schools and hotels.
C2 LowAtmospheres with low level of pollution.
Mostly rural areas.
Unheated buildings where condensation may occur, e.g. depots and sports halls.
C3 MediumUrban and industrial atmosphere, moderate sulphur dioxide pollution. Coastal areas with low salinity.Production rooms with high humidity and some air pollution, e.g. food processing plants, laundries, breweries and dairies.
C4 HighIndustrial areas and coastal areas with moderate salinity.Chemical plants, swimming pools, coastal ships and boat yards.
C5-I High (Industrial)Industrial areas with high humidity and aggressive atmosphere.Buildings or areas with almost permanent condensation and with high pollution.
C5-M High (Marine)Coastal and offshore areas with high salinity.Buildings or areas with almost permanent condensation and with high pollution.

2. Select Durability (ISO-12944-1)

Durability (ISO 12944-1: 4.4)Years to 1st major maintenance
Low (L)2 - 5 years
Medium (M)5 - 15 years
High (H)More than 15 years
Durability consideration
How long do you want the system to last before any major maintenance?
Is the steelwork readily accessible for maintenance?
* Durability is not a guarantee time. Durability is a technical consideration that can help the owner set up a maintenance programme.

3. Select a Complete Coating Services System

C1 + C2

AK = Alkyd

EP = Epoxy

Pur = Polyurethane

Alkyd systems: Moderate mechanical resistance, good weather resistance, e.g. machinery, equipment, building frameworks, doors and frames.

C3

AK = Alkyd

EP = Epoxy

Pur = Polyurethane

Epoxy systems: Good mechanical resistance, chalks outdoors, e.g. frameworks, platforms and pipeworks.

Polyurethane systems: Very good weather and UV-light resistance, good mechanical resistance, e.g. frameworks, platforms, machinery and equipment.

C4

AK = Alkyd

EP = Epoxy

Pur = Polyurethane

Epoxy systems: Good mechanical resistance, chalks outdoors, e.g. frameworks, platforms and pipeworks.

Polyurethane systems: Very good weather and UV-light resistance, good mechanical resistance, e.g. frameworks, platforms, machinery and equipment.

C5-I
AK = Alkyd
EP = Epoxy
Pur = Polyurethane

Epoxy systems: Good mechanical resistance, chalks outdoors, e.g. frameworks, platforms and pipeworks.

C5-M

Epoxy systems: Good mechanical resistance, chalks outdoors, e.g. frameworks, platforms and pipeworks.

Polyurethane systems: Very good weather and UV-light resistance, good mechanical resistance, e.g. frameworks, platforms, machinery and equipment.