High Performance Highway Structures - RIBAProductSelector.com

While the above protective systems are those most commonly specified for Highways Agency contracts, many DBFO
Contractors and Local Authorities have preferred to employ other proprietary products and systems which can extend
the life between maintenance periods such as glass flake epoxy barrier coats and acrylic polysiloxane finish coats.
Interzone 505 glass flake epoxy can be applied up to 500 μm d.f.t. in a single spray application and can eliminate
the need for aluminium metal spray on new structures thus reducing costs and improving production without
compromising the corrosion protection.
Interfine 979 acrylic polysiloxane has been adopted by many Local Authorities as their favoured choice of top coat.
The product’s barrier protection can be compared to an epoxy intermediate allowing a reduction in the paint system
while its long term gloss and colour retention make it a clear choice for high profile structures such as bridges.
Recommended systems to offer a life to first major maintenance of 25 years+ are:-
1. Surface Preparation:
Blast clean with chilled iron grit or aluminium oxide grit to Sa2½ medium profile.
Coating System:
1st Coat: Intergard 307 Zinc Phosphate Epoxy Blast Primer (2 Pack) to 25 μm mdft
2nd Coat: Interzone 505 HB Glass Flake Epoxy (2 Pack) to 400 μm mdft
3rd Coat: Interfine 979 Acrylic Polysiloxane (2 Pack) Finish to 100 μm mdft
2. Surface Preparation:
Blast clean with chilled iron grit or aluminium oxide grit to Sa2½ medium profile.
Coating System:
1st Coat: Interzinc 52 HS Epoxy Zinc Rich Primer (2 Pack) to 75 μm mdft
2nd Coat: Intercure 384 MIO HB/QD Epoxy Undercoat (2 Pack) to 125 μm mdft
3rd Coat: Interfine 979 Acrylic Polysiloxane (2 Pack) Finish to 100 μm mdft
Both systems eliminate the necessity for aluminium metal spray and therefore can show cost savings
when compared to other systems.
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