Polishing Services: Mirror & Specular Finishes for Metal Parts
Polishing refines a metal surface to a mirror or satin sheen by working through progressively finer abrasives. Beyond looks, a polished surface resists corrosion, cleans easily, and seals better—so it earns its place on food, medical, and architectural parts. This guide covers how it works, Ra targets, when to choose it, materials, and how to spec your job.
How Polishing Works
Starting from a ground surface, we move through abrasive belts, compounds, and buffs to close the surface valleys. The goal is a target roughness (Ra): a satin finish around 0.4 µm, a mirror below 0.05 µm. Polishing usually follows surface grinding or centerless grinding, and it pairs with passivation or anodizing for a finished, protected part.
Polishing vs. Grinding
Grinding removes stock to hit a dimension; polishing removes almost nothing and only improves the surface. You grind to shape, then polish to finish.
Finish Levels
- Course / satin—Ra ~0.4–0.8 µm, for grip and cleanability.
- Brush / directional—consistent grain for architectural look.
- Mirror—Ra < 0.05 µm, reflective and hygienic.
Materials We Polish
- Stainless steel—the dominant mirror-finish material.
- Aluminum and brass—for decorative and optical parts.
- Titanium and exotic alloys—medical and aerospace.
Industries That Rely on Polishing
Food and pharmaceutical equipment, surgical instruments, architectural trim, and consumer hardware all need polished, cleanable surfaces.
How to Spec Your Polishing Job
- State the Ra target (e.g. <0.05 µm mirror, 0.4 µm satin).
- Choose finish type—mirror, satin, or directional brush.
- Define the area to be polished (all-over vs. feature).
- Note the base process so we start from the right roughness.
- Flag any no-polish zones (sealing surfaces, threads).
- Share the end use (food, medical, decorative).
FAQ
How smooth can you get?
Mirror finishes below 0.05 µm Ra are routine on stainless.
Does polishing change size?
Barely—it’s a surface refinement, not stock removal.
Can aluminum be mirrored?
Yes, with the right compounds and a protective coat.
Why Choose Huaxiao for Polishing
Our polishing service delivers the finish your part needs, from satin to mirror, with integrated grinding and finishing. Send your drawing for a quote covering the full surface treatment.
