Duplex Corrosion Protection
Many Catnic lintels employ not just one but two methods of protection against corrosion attack: the unique, sophisticated Duplex double protection system.
- 1st corrosion protection layer - galvanised steel
- 2nd corrosion protection layer - black polyester coating
The lintels are manufactured from hot-dipped galvanised steel to BS EN10142: 2000 of grade DX51D & Z275 with a black coloured polyester resin finish. The protection system complies fully with the chemical and physical test requirements outlined in Table 2 of BS 5977:PART 2: 1983 for lintels effectively having their own built-in Damp Proof Course (DPC).
This double method of protection gives Catnic lintels inherent benefits over those offered by other manufacturers using the more traditional pre or postgalvanised steel techniques.
Both these processes rely on just a simple coating of zinc to provide cathodic protection. The zinc protects the steel but is itself liable to rust with aqueous alkaline solutions leaching from the building fabric and therefore corrode.
The black polyester coating in the Catnic process provides an effective barrier against moisture or chemical attack leached from the masonry construction.