Products Finishing

JAN 2013

Products Finishing magazine is the No. 1 industrial finishing publication in the world. We keep our readers informed about the latest news and trends in plating, painting, powder coating, anodizing, electrocoating, parts cleaning, and pretreatment.

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DoI is defined in ASTM D430/D5767. Beyond Mechanical Polishing? At least one manufacturer offers mirror-finish stainless steel that it claims is superior even to the socalled No. 8 grades such as those described above. Pacific Plus Specialties, based in Dallas, offers No. 8 (so-called True No. 8) and, superior to that, CMP Super No. 8, produced by ��chemical mechanical polishing.�� This is a technique almost universally used in polishing of semiconductor silicon wafers and associated copper surfaces in electronics, but its use for larger surfaces (nominal 1,200 �� 2,400 mm) is very rarely found. The highest possible degree of surface finish is usually desirable for two distinct reasons. In the short term, it��s desired both for aesthetic and functional reasons. In the longer term��months and years�� there��s abundant evidence that the TaBle 2���oPTical Values for Mirror-finish saMPles Sample Gloss(GU) R(spec) DoI Haze R 77 76 96.6 0 0 79 82 95.6 1.6 A 89 97 96.5 0.7 smoother the surface, the slower the corrosion or tarnishing, since it is more difficult for such micron or sub-micron sized particles to lodge. What seemed to be identical grades of mirror-finish stainless steel from different manufacturers differed significantly in their surface finish and optical properties, though all conformed to the relevant standard. The shown measurements enable such differences to be identified and quantitatively characterized, and the relevant standards could usefully be revised to include such measurements. There is not always a simple relationship between surface roughness and optical properties. Manufacturers of this type of product should provide purchasers with technical information as to the state of surface finish and not just rely on the ill-defined classification laid down in existing standards. n Anselm Kuhn is with Metal Finishing Information Services and can be reached at office@finpubs.com. John Fletcher is with Elcometer, elcometer.com. LearnMORE Lasers Put a Shine on Metals To read how researchers at the Fraunhofer Institute for Laser Technology ILT in Aachen have developed a way of automating polishing work, visit pfonline.com/news/lasers-puta-shine-on-metals(2). Let���s get started on your ���nish. From initial consultation, through all the details, to final installation and setup, you can count on us. Compliant���on every level. 800.609.6408 | 214.382.2634 www.compliantpaintbooths.com pfonline.com 25

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