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Testing
Aesthetic endurance test in open atmosphere for 5 years. Right hand sheets are BlueScope Clean COLORBOND where as left hand sheets are others which were affected by dust while Clean COLORBOND remain unaffected after a 54 month outdoor exposure Singapore.
 
 
Every Pre-painted Clean COLORBOND and ZICALUME steel sheet pass through quality check and logo stamped to assume you of quality product backed by BlueScope and laser printed product detail, manufacturing date on the underside.
 
 
 
Test, Quality Inspection of pre-coated steel Zincalume
Zincalume pre-coated steel undergoes a continuous hot-dipped coating process resulting in its superior corrosion resistance over Galvanised Steel and Aluminised Steel when subject to identical application. The projective property of Zincalume is two foldssuch that aluminium protects against corrosive attack and enhance roll-forming while Zinc provides Cathodic protection. The combination makes Zincalume a few more superior coating than other process or material.

Moreover, through extensive laboratory test undertaken by the Chemical and Metallurgical Division of Hong Kong Productivity Council, it has been proven that pr-coated steel Zincalume, subsequently pre-painted either pre-forming or post-forming, still maintain its metallurgical properties more superior that pre-painted galvanised steel whether its pre-painted at the plant or on site.

To summarize, the protective property of any pre-painted steel are only as good as the protective property of the pre-coated steel prior to pre-painting process. The resulting comparative test indicates that pre-coated Steel Zincalume’s protective property is for more superior that Galvanised Steel as clearly exidenced by the exhibits below

   
Testing methodology – Spraying steel salinated water  
- Exhibit 1 Galvanised Steel after 500 hours of spraying 20% of surface corroded white remaining start to   corrode.
- Exhibit 2 Galvanised Steel after 2,000 hours of spraying 95% of surface are in advanced corrosive staled.
- Exhibit 3 Pre-coded Steel Zincalume after 500 hours of spraying early sign of corrosion is visible.
- Exhibit 4 Pre-coated Steel Zincalume after 2,000 hours of spraying 25% of surface starts to corrode.
 
 
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