Sustainable Construction - Building & Construction Authority
Sustainable Construction - Building & Construction Authority
Sustainable Construction - Building & Construction Authority
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<strong>Sustainable</strong> <strong>Construction</strong> -<br />
What are the surface preparation works needed to receive the intuescent paint?<br />
For mild steel, the untreated surface has to be<br />
blasted to grade Sa 2.5 (95-99% clean) for<br />
priming purpose. This requirement is also stated in<br />
the work section on Protective Works for Structural<br />
Steelworks in the National Productivity and Quality<br />
Specifi cations (NPQS).<br />
For galvanized steel, the surface must be<br />
“etched” using a compatible and approved<br />
etching primer.<br />
Galvanised steel must be “etched” using a compatible<br />
and approved etching primer<br />
58<br />
Sand-blasted Material Surface<br />
Hot-dip Galvanized Material Surface<br />
Sa 2.5
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