High Performance Highway Structures - RIBAProductSelector.com

Over recent years the Highways Agency has moved towards the use of two pack epoxy and polyurethane coatings
for the protection of steel bridges in preference to more conventional single pack paints.
These coatings offer improved corrosion protection and durability, savings in application and
traffic management costs, and compliance with Environmental Legislation.
Coating systems for new highway structures are detailed in Highways Agency’s Specification for
Highways Work Series 1900 and can be summarised as follows.
Type 1 - Ready Access
Surface Preparation:
Blast clean with chilled iron grit or aluminium oxide grit to Sa3, medium profile.
Coating System:
1st Coat: Item 111, Intercure 324, Zinc Phosphate HB/QD Epoxy Blast Primer (2 Pack)
2nd Coat: Item 112, Intercure 384, MIO HB/QD Epoxy Undercoat (2 Pack)
3rd Coat: Item 168, Interthane 870, Polyurethane (2 Pack) Finish to 50 μm mdft
Minimum Total Dry Film Thickness: 300 microns
Type II - Difficult Access
Surface Preparation:
Blast clean with chilled iron grit or aluminium oxide grit to Sa3, medium profile.
Metal Coating: Aluminium Metal Spray to 100 μm mdft
1st Coat: Item 159, Intergard 214, Aluminium Epoxy Sealer (2 Pack)
Apply at 12-20 m²/litre
2nd Coat: Item 111, Intercure 324, Zinc Phosphate HB/QD Epoxy Blast Primer (2 Pack)
3rd Coat: Item 112, Intercure 384, MIO HB/QD Epoxy Undercoat (2 Pack)
4th Coat: Item 168, Interthane 870, Polyurethane (2 Pack) Finish to 50 μm mdft
Minimum Total Dry Film Thickness of the Paint System: 300 microns
Type III - Interior of Box Girders
Surface Preparation:
Blast clean with metallic abrasive to Sa2½, medium profile
Coating System:
1st Coat: Item 111, Intercure 324, Zinc Phosphate HB/QD Epoxy Blast Primer (2 Pack)
2nd Coat: Item 112, Intercure 384, MIO HB/QD Epoxy Undercoat (2 Pack) to 100 μm mdft
Minimum Total Dry Film Thickness: 200 microns
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