Ranki Engineering (Pvt) Ltd imports premium quality Zinc-Aluminium, both colour coated (pre-painted) and in non-colour in coil form from Korea for value addition, by profiling same into roofing, cladding and related accessories.

What is Zinc-Aluminium
Alloy Coated Steel

Zinc -Aluminium material coating comprises:

  • Aluminum - 55%
  • Zinc - 43.4%
  • Silicon - 1.6%

Since Aluminium is known to possess excellent anti-corrosive properties, it provides a protective barrier against corrosion under normal weather conditions.

Atmospheric exposure tests have confirmed that the corrosion resistance feature of Zinc-Aluminium alloy coated steel is far superior to an ordinary zinc coating, since the 150 gms/ m2 coating (coating mass AZ 150) on an average, lasts upto four times that of galvanized steel which has a coating mass of 270 gms/ m2 (Z27) in similar environmental conditions.

Prepainted Steel

Material specifications of ZINC
ALUMINIUM alloy coated steel and Pre painted steel

Total coating thickness (TCT) : 0.47 mm , 0.40 mm and 0.35 mm
Minimum coating mass : 150 gms / m2 (AZ 150)
Minimum yield strength : 550 MPa (also referred to as High - tensile steel)

Conformity to International Standards:

ZINC - ALUMINIUM alloy coated steel and Pre painted steel conform to the following International Standard Codes: AS1397,ASTMB117,ASTM A792

ZINC-ALUMINIUM steel is chosen as the substrate with PRE PAINTED steel range for roofing and wall cladding applications. Pre painted steel goes through a four stage process, whereby the ZINC-ALUMINIUM steel is applied with a conversion layer chemically applied. An epoxy primer is then baked onto the surface and thereafter a durable exterior grade topcoat is baked on.

PRE-PAINTED steel is designed to give the superior strength of steel, corrosion resistance of the ZINC-ALUMINIUM alloy coated steel and an oven baked finish which is able to withstand varying weather conditions. The coating used in the manufacture of Pre painted steel has been formulated to resist fading, peeling, chipping and cracking.

The design flexibility and versatile nature of Zinc-Aluminium in diverse applications, facilitate innovative design possibilities to architects and other users of this product.