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Surface roughness - Ra value
Surface roughness is an indication of the texture of a surface of metal. Roughness is mostly not desirable in constructions and sheet metal work, because it increases the risk of corrosion. The most common way of indicating roughness is by an Ra value. Deprest can offer you roughnesses for sheets and constructions of Ra 0.8µm.
We can measure it and even give you a printed roughness report if necessary. Peter Depraetere
