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Metposite panels are formed from Zinkalume®
or Galvalume® steel. Both have a metallic coating applied by a continuous coating
process whereby properly cleaned low-carbon, cold-rolled sheet steel is
dipped into a molten aluminum-zinc bath. The alloy bath
temperature is around 600C, and the coating is solidified very rapidly to
obtain a fine-grain microstructure with enhanced corrosion resistance,
compared to the pure zinc coating (galvanized coating) or pure aluminum
coating.
The galvanized coating contains
55% aluminum, 43.5% zinc, and 1.5% silicon.
The result is a highly corrosion-resistant
sheet steel that delivers the best protective features characteristic of
aluminum and zinc: the barrier protection and long life of aluminum plus the
sacrificial or galvanic protection of zinc at cut or sheared edges
In
addition to forming a physical barrier against corrosion, zinc, applied as a
hot-dip galvanized coating cathodically protects exposed steel. Zinc has a
self-healing mechanism in it. The zinc coating sacrifices itself slowly by
galvanic action to protect the base steel. This sacrificial action continues
as long as any zinc remains in the immediate area.
In simple terms the edges will not rust.
The silicon is introduced primarily to
assist in the formation of a thin layer of intermetallic compound between
the coating and base metal, providing coatings with good adhesion.
Hot-dip galvanized steel
will last very well in most environments. It is not uncommon for galvanized
steel to last more than 70 years. Hot-dip galvanized steel has been
effectively used for more than 150 years. The value of hot-dip galvanizing
stems from the relative corrosion resistance of zinc.
In addition to all the
protective quality, it has excellent forming capabilities.
Therefore, no damage or compromise of the metal’s strength or corrosion
protection occurs during the forming of the panels.
Color
Coating Kynar 500®
Kynar 500®
is a Fluoropolymer Coating
system. The secret of fluoropolymer's remarkable properties lies in its
molecular structure; the carbon/fluorine bond (one of the strongest known to
man) is the key to the coating's unsurpassed thermal, chemical and ultra
violet resistance.
The final coating
for is a factory-applied, oven baked finish based on Kynar 500®
resin (Polyvinylidene
fluoride). This finish is a dispersion coating based on Kynar 500®
resin as formulated by
Kynar 500®
licensees. This finish is
in strict accordance with the formulator's specification and applied by an
applicator approved by the formulator. This finish based on Kynar 500®
shall meet the performance
criteria of AAMA 2605.2 specification, and certified by the formulator as
containing KYNAR 500 resin.
Kynar 500
resin-based coatings out perform polyester powder,
urethane, silicone
polyester and acrylic coatings in every category:
better color retention;
better gloss retention; better resistance to chalking. Kynar 500®
resin-based finishes meet
or exceed the physical test performance criteria of the Architectural Spray
Coaters Association (ASCA 96) and the American Architectural Manufacturers Association
(AAMA 2605.2) for high-performance organic coatings on architectural
extrusions and panels.
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