Fittings with Aluminium-zinc FAAluminium-zinc FA
Aluminium-zinc is an aluminium-zinc coated sheet steel that can be used up to corrosion class C4. For information regarding corrosion classes, see table on the next page. The metal coating consists of 55% aluminium, 43.4% zinc and 1.6% silica (percentage by weight). The coating weight is 185 g/m2 double sided, with designation AZ185. The layer of aluminium-zinc is 25 μm (0.025 mm) thick per side on an AZ185 product. The surface is treated with anti-fingerprint coating to prevent discolouring during handling and to facilitate shaping.
The surface is initially shiny with a rose pattern which after some time outside will become greyish and matt. The rose pattern can vary from front to back and from coil to coil. It can also darken unevenly after rubbing due to the aluminium in the metallic coating.
Aluminium-zinc is available in FA quality, which means DX51. The base material FA can be used for fittings and other details where tight seams are not required.