Plain finish on UNISTRUT channel is an oiled finish that is applied to the raw material by the steel mill. The cold rolling process used to form UNISTRUT channel removes the excess of this oil and the residue provides a modicum of protection for the channel in storage. The plain finish on UNISTRUT fittings is that of the commercial bar stock input material. No surface treatment is applied to plain finish fittings.
Input material is supplied by the steel mill generally in accordance with AS 1397 having a coating class of Z275. The material is slit to width and roll formed to shape.
Hot Dipped Galvanised
Coatings are applied generally in accordance with AS/NZS 4680. The thickness of the coating is dependent on the material thickness of the component being galvanised. It should be noted that due to the galvanising process, the thickness of the coating will vary over the surface and should be taken into account during component assembly. It may be necessary to remove excess buiId-up prior to use.
Unistrut stainless steel channel is manufactured from Grade 316 stainless steel. The material is slit to width and roll formed to shape. Grade 316 stainless steel has excellent corrosion resistance and has advantages over grade 304 stainless steel, such as:
Channel and parts are carefully cleaned and phosphated. Immediately after phosphating, a uniform coat of thermosetting polyester powder is electrostatically applied then baked. Minimum coating thickness to exterior surfaces is 50 microns. The polyester coating is ultra-violet stabilised.
Channel, fittings and components are electroplated generally in accordance with AS 1789 Service Condition 2.
Fasteners are electroplated generally in accordance with AS 1897 Service Condition 1.
Unistrut aluminium channels are manufactured from high strength alloy 6106-T6 for all extruded components and 5005 for sheet or plate components. These alloys are suitable for marine applications and offer excellent all round corrosion resistance.
When specific applications require other commercially available finishes, they can be supplied according to specification.