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Polishing is a mechanical surface finishing process that uses fine abrasives, compounds, and buffing tools to produce a smooth, reflective, and mirror-like finish onmetal or plastic surfaces. It removes microscopic peaks and surface irregularities, significantly lowering surface roughness, often achieving values below 0.1 µm Ra, depending on the polishing grade and material. This process enhances aesthetic appearance, reduces friction, and improves cleanability, making it ideal for components used in medical, food processing, optical, and precision engineering applications. Polishing does not significantly affect part dimensions but may involve minimal material removal, so it's typically applied after achieving final tolerances. It also helps eliminate stress risers and minor surface defects that could initiate fatigue cracks. Commonly used onstainless steel,Aluminum, andtitanium, polishing improves surface reflectivity and can enhance corrosion resistance when used in conjunction with passivation. The finish quality depends on factors like abrasive size, polishing speed, and applied pressure.
All metals like (Aluminum ,stainless steel etc.), and someplastics.
Typically Ra ≤ 0.05–0.8 µm (mirror to smooth finish).
Gloss units (GU) > 85 for high gloss finish
Cosmetic upon request.
Removes a small amount of material, typically 0.02–0.2 mm (20–200 µm).
Can range from mirror-like to brushed based on grit/compound.
6061 T6, 6082, 7075-T6, 5083-H111, 6063, 5052, 2024-T351, 7050, 2017A, 6082-T651, 7075-T651, 2014, 6061-T651, 7075-T7351, 6082-T6, 2014-T6, 6063-T5, 6063-T6, 5083-H32, 5052-H32
A2 Tool steel, D2 Tool steel, A3 Tool Steel, O1 Tool Steel, S7 Tool Steel, H13 Tool Steel
932 Bearing Bronze , 954 Bearing Bronze, 544 Bearing Bronze
Polishing typically achieves 0.1–0.4 µm Ra, while buffing can reduce roughness to 0.01–0.1 µm Ra for a mirror-like finish..
Common abrasives include aluminum oxide, silicon carbide, diamond paste, and cerium oxide, with grit sizes from 320 to 5000+ for fine finishes.
Yes, excessive polishing can slightly alter dimensions, requiring precise control to maintain tolerances within ±0.01 mm for critical components.