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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. 3
Track Record Interzone glass flake epoxy has an established track in the severe environmental conditions of the Offshore Oil Industry and was introduced into the Onshore Bridges Sector in 1993. Since then it has been adopted by many authorities for both new steel and maintenance projects including:- Brafferton Bridge M25 Gantry Frome Footbridge New Hall Footbridge Middleton Bridge Woodhall Footbridge River Air Footbridge Scalpay Bridge Croydon Tramlink Chain Bridge Helmsley Road Bridge Tyne Millennium Bridge Wye Bridge White Bridge Doncaster Viaduct Parkway Bridge Southampton Underpass A1 Willowburn Bridge St Marys Bridge Centenary Way Viaduct North Yorkshire CC Highways Agency Gloucestershire CC Sheffield City Council Northumberland CC North Yorkshire CC North Yorkshire CC Western Isles Council Gibbs Ltd Monmouth CC Derbyshire CC Gateshead MBC Monmouth CC Hampshire CC Doncaster MBC Hampshire CC Hampshire CC Highways Agency Doncaster MBC Rotherham MBC 4
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