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Because, there are two types of RZ value- shortwave & longwave. A High Longwave RZ value will be less smooth than a high shortwave RZ value, because in shortwave, even though the RZ value is high, the undulations are very close together, and so will appear smooth when measured over a long or short area. A High RZ longwave surface appears less smooth, as the undulations occur over a longer area, and so will have more effect with relation to how smooth the surface is. RZ measures only the height of the surface descrepancy at any given point, its not concerned with the frequency of that descrepancy over any distance of the surface-this is how RZ value can be high, but surface finish appears smooth- Its a High RZ, short wavelength surface. Hope this Helps, Will at phantomscreenprint.co.uk

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Q: How can the Rz value measure high even if the surface finish is good?
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