![]() One alternative is the light gauge, dull rolled-on (coined) finishes that simulate abrasive blasting. The supplier’s production control should therefore be evaluated. The appearance of abrasive blasted surfaces is often not consistent. The surface is not as rough as sand or silicon carbide blasting, but, like other blasting methods, it is substantially rougher than Ra 20 microns or 0.5 micrometers and can increase the likelihood of corrosion problems. It dulls but does not significantly darken the surface. Glass bead is the most popular blasting method. Rough abrasive blasted surfaces are not suggested for locations with salt or industrial pollution exposure, unless a more corrosion-resistant stainless steel than would otherwise be selected for the environment is specified and it is cleaned regularly. It can also be very difficult to remove graffiti and other deposits from rough surfaces without further abrasive blasting which may not be practical, so the service environment must be considered. This must be considered during alloy specification. The rougher texture of abrasive blasted surfaces can make them prone to staining or corrosion because dirt and corrosive substance accumulation is increased. Abrasive Blasting Some abrasive blasting media will produce a duller grey color on stainless steel. ![]() Three options for obtaining black or dark grey appearances - paint, electrochemical and PVD coloring - are discussed in the Finishes section of IMOA’s website and in more detail on the page Colored Stainless Steel: Specification and Problem Avoidance. There are significant differences in the durability of these coloring options and their suitability for different environments. There are numerous options for creating duller or darker tones, including black on stainless steel. Stainless steel is inherently a silver grey metal. ![]()
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