Coating Protection For Steel
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) | Exterior | Interior |
| C1 Very Low | Heated buildings with clean atmosphere, e.g. offices, shops, schools and hotels. | |
| C2 Low | Atmospheres with low level of pollution. Mostly rural areas. | Unheated buildings where condensation may occur, e.g. depots and sports halls. |
| C3 Medium | Urban 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 High | Industrial 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? |
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.
Epoxy systems: Good mechanical resistance, chalks outdoors, e.g. frameworks, platforms and pipeworks.
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.
