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Exposed Surface Coatings Metalcoat System Selection Guide

Prembond Metalcoat Systems are divided into 4 categories which involve different surface preparation .i.e. Categories A,B, C, and D. For a summary of these categories please go to the bottom of this page or click here

Surface Preparation
Protecting:
Metalcoat Systems
Expected Service
Life (years)
Average Thickness
(Microns)
1st Maintenance
Coat (years)
Category A
(water-jetting or
abrasive blasting)
Steel Structures
rigs, jetty piles,
decking, walkways,
ramps, loading
installations,
very hot pipes
plant, tanks, pipelines,
cranes, bridges,
Steelwork

20-30

15-25

12-15

12-15

1500

1000

4-500

4-500

-

-

-

-

Category B
(power tool)
process plant,
pipe bridges,
structural steel,
pipework,
fittings,
pipelines,
tie bars,
storage tank bases,
metal roof purlins,
hot pipework


7-9

30

30

30

15

15


4-500

1600

1600

1400

1250

2300
(55% overlap)

-

-

-

20

-

-

Category C
(handwire brushing)

cold/damp pipes,

badly rusted/pitted
pipes and
structural steelwork,
fittings,
pitted pipelines,
old metal roof sheets


15

15

30

30

1400

1400

3000

2800

-

-

-

20

Category D
(no cleaning)
pre-stressing and
post tensioning
bridge cables and
anchorage
50 plus
sleeve/anchorage
completely filled
-


Surface Preparation:
     
  Category A Abrasive water jetting or ultra high pressure water-jetting

 

  (also suitable for dry abrasive blasting)
Standard: Sa2
Surface profile: 50-75 microns
flash rusting: suitable over visibly patchy flash rust
   
Category B Fresh water wash down followed by a thorough hand/power tool cleaning
    Standard: St2
     
Category C Fresh Water washdown, heavy chipping hammers to remove heavy rust, thorough
    hand wire brushing to remove all loose scale and old coatings(conditions where St2 mechanical cleaning is not fully achievable due to condensation, deep pitting etc).
     
  Category D No cleaning required - new cables
     
Detailed Surface Preparation Data must be referred to.



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