EVS-EN ISO 4628-3:2024

ISO 4628-3 specifies methods for assessing the degree of rusting on surfaces coated with paints and varnishes (organic coatings). It also applies to surfaces with a metallic coating plus an organic coating (duplex system), using comparisons with pictorial standards.

The pictorial standards provided in ISO 4628-3 show surfaces which have deteriorated to different degrees by a combination of rust broken through the coating and visible under-rusting. This system is intended to be used, in particular, for defects caused by ageing and weathering, and for uniform changes such as colour changes, for example yellowing The assessment of the degree of rusting in ISO 4628-3 is only an estimation of the affected area on specimen. Edges are not included.

ISO 4628-3:2024 text has been approved in Europe as EN ISO 4628-3:2024 without any changes.