ZnAl Galfan Galvanized Wire Coil 2.2mm BWG13 Coastal Corrosion Resistant

ZnAl, often sold under the Galfan name, replaces a pure zinc coating with a 95% zinc and 5% aluminium mischmetal alloy. The aluminium changes how the coating behaves at the surface: instead of zinc corrosion products that can wash away, it forms a more stable, more adherent layer that resists chloride attack considerably better than plain zinc of the same mass. In salt spray testing a 200 - 240 g/m2 ZnAl coating typically lasts two to three times as long as the equivalent zinc mass, which is why coastal fence, marine netting and industrial perimeter projects specify it even though the coil costs 15% - 20% more per ton.

The cost comparison should be done on service life, not on coil price. If a standard zinc fence needs replacement in year six on a coastal site and the ZnAl version lasts fifteen, the annual cost is lower even at a higher purchase price, and the maintenance labour saved is usually the larger number.

• Alloy coating, not pure zinc: 95% Zn with 5% Al and mischmetal gives a denser, more adherent corrosion layer in chloride environments.
• Extended salt spray life: 1000+ hours to red rust in ASTM B117 testing with a 200 - 240 g/m2 coating, against roughly 400 - 500 hours for the same zinc mass.
• Better formability: the alloy coating is more ductile than pure zinc, so it survives weaving and bending with less micro-cracking at the bend radius.
• Cleaner appearance retention: the surface greys evenly instead of developing the white rust patches typical of zinc in humid marine air.
• Compatible with PVC coating: holds adhesion well after the pre-treatment dip, useful for coated mesh producers.
• Documented performance: salt spray reports supplied per coating class so the specification can be verified, not assumed.

Specify ZnAl for coastal perimeter fencing within a few kilometres of the sea, island and port installations, offshore support yards, sewage and water treatment plants, livestock enclosures in humid tropics, and industrial sites with sulphur or chloride exposure. It is also the sensible choice for gabion and rockfall netting in wet climates, where the wire is in permanent contact with damp stone and drainage water. Inland dry applications rarely justify the price premium, and we will tell you so; the honest recommendation is worth more than an upgraded invoice.

Coating mass is measured by stripping, coating composition is verified by spectrometer on each production shift, and salt spray samples are sent to a third party laboratory at agreed intervals with reports supplied against the order. Wire is tested for tensile, elongation, torsion and bend adhesion. Documentation includes the mill test certificate, coating composition and mass report, salt spray result, packing list and certificate of origin.

Coils are wrapped in VCI paper and plastic film, covered with hessian or woven bag, strapped and palletised. ZnAl coils are marked with the alloy designation on the tag so they are not mixed with plain zinc stock in your warehouse, which is a real risk when both are stored together. Lead time is 20 - 25 days after deposit. Shipping documents are prepared for T/T or L/C settlement, and third party pre-shipment inspection can be arranged.