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Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Glass flake epoxy system protects bridge a...

Sunday, 22 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Glass flake epoxy system protects bridge against corrosion

Wednesday, 6 August 2014

The task of protecting the existing Blackfriars rail bridge and station in London presented a challenge in that a protective coating for steelwork was preferred.

Blackfriars rail bridge and station in London

Source: Freshfield

Blackfriars rail bridge and station in London

Source: Freshfield

With the River Thames below, inherent issues of dampness and humidity meant that the choice of coating would be of importance, because Network Rail specified a minimum service life of 25 years to first major maintenance. The roof of the new station was covered with 4,400 photovoltaic panels, providing up to half of the energy needed to run the railway station below.

Existing paintwork was removed by blast-cleaning

Originally developed to protect offshore structures from the severe marine environment in North Sea oil and gas applications, an epoxy glass flake resin system from Sherwin-Williams Protective & Marine Coatings EMEA was chosen. The three-coat preventative maintenance product provides good adhesion and anti-corrosion properties and acts as a barrier against the harsh weather conditions. The benefits using this system comes in terms of labour saving costs, lower energy usage and volumes of paint required. In addition, the higher volume solids coating system meant that fewer VOCs were emitted during the process. The existing paintwork on the rail bridge was removed by abrasive blast-cleaning. The three-coat repainting system comprised; "Metagard L574” Blast Primer at 25um minimum dry film thickness (mdft), "Epigrip M922” Glass Flake Epoxy Intermediate at 400um mdft and "Resistex C137V2” Special Finish at 50um mdft. A stripe coat of "Epigrip M922” at 200um mdft was applied between coats one and two. In total more than 60,000 square metres of new and old iron and steel was coated.

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