After 1000 hours in a salt spray, the adherence of the fabric to the steel sheet is identical to that before the test.
Four barriers separate the humid area from the steel:
- The zinc
- The chemical treatment
- The primer
- The adhesive
The corrosion resistance is therefore greatly improved.
Non Drip Processing
After numerous comparative tests, two components have been selected:
- A hard wearing tear resistant fabric
- An adhesive with excellent properties to guarantee its stability for bending, profiling, punching, and shearing processes under normal conditions.
Non Drip is supplied in coil form with the overlap edge uncoated. This is to prevent water being drawn into the lap by syphonic action.
A varnish has to be site applied to the end of the overlap to prevent water ingress by syphonic action. Similarly this has to be applied to the gutter end of the sheet.
Alternatively a blow torch can be used as shown in the attached diagrams