Sink finishes compared: brushed, PVD and nano coating

A finish is judged in year three, not on the showroom floor. Three processes dominate stainless sink production, and they fail in completely different ways: a brushed sink scratches but can be repaired, a PVD sink resists scratching but cannot be repaired, and a nano coating hides fingerprints until the day it stops hiding anything.

Brushed: the default, and still the right one for most markets

Brushing is mechanical. The bowl is passed under abrasive belts or wheels, usually 180 to 320 grit, which lays down a directional grain. Nothing is added to the surface, so nothing can peel off.

The advantage nobody talks about is repairability. A scuff on a brushed sink can be worked out on site with a Scotch-Brite pad, moving along the grain. Fifteen minutes and the mark is gone. No coated finish offers that, and it is why brushed remains the specification of choice in Europe and North America, where a kitchen is expected to survive a decade of use.

Two details worth writing into a purchase order. First, grain direction: a straight grain that runs the length of the bowl looks deliberate, a random grain looks cheap. Second, grain consistency between the bowl and the drainboard, because the two are often brushed in separate passes and can end up visibly different.

PVD: colour that survives handling

Physical vapour deposition deposits a thin ceramic-metal layer, typically 0.5 to 2 microns, onto the stainless in a vacuum chamber. The layer bonds at a molecular level rather than sitting on top of the steel.

The result is hard. PVD coatings reach roughly 1500 to 2500 HV, which is harder than the stainless underneath and hard enough that a kitchen knife will not leave a mark. Colour is stable because it comes from the coating chemistry, not from a dye, and it does not fade under UV.

The trade-offs are real. PVD adds 15 to 30 percent to unit cost. It cannot be repaired: a deep scratch that breaks through the layer leaves bare steel visible against the colour, and there is no spot fix. And the colour must be matched by batch, because two separate coating runs of the “same” gold can differ by a shade that is obvious when the two sinks sit side by side in a showroom.

If you are ordering PVD for a project, state the batch requirement on the PO and take delivery in one run. Distributors who re-order three months later and expect an exact match are the source of most colour complaints in this category.

Nano coating: useful, but read the test data

Nano coatings are sprayed or dip-applied, usually 5 to 15 microns thick, and they work by making the surface hydrophobic. Water beads, fingerprints sit on top of the film rather than in the grain, and cleaning takes less effort.

The honest limitation is service life. A nano coating is a sacrificial layer. Under daily use with hot water and detergent it degrades over roughly two to five years, and once it goes the surface underneath is ordinary stainless that has never been brushed to a finished grain. Strong alkaline cleaners accelerate the process.

When a supplier quotes a nano finish, ask for the abrasion test rather than the marketing sheet. A Taber abrasion result with the test cycles stated tells you what the coating actually does. A claim of “easy clean” without a number tells you nothing.

What each finish costs and who should buy it

Mixed-finish orders are common and usually a mistake. If a container carries brushed and PVD units under the same SKU family, the retail floor will display them together and the difference in sheen reads as a quality problem rather than a feature.

Maintenance that keeps any finish alive

All three finishes dislike the same thing: chlorine. Bleach-based cleaners and chlorinated dishwasher detergent attack the passive layer on stainless, and on PVD they attack the edge of the coating where it is thinnest. Rinse after cleaning rather than letting a solution dry on the surface.

For brushed sinks, a light application of mineral oil along the grain once a month slows the appearance of water spots. For PVD, a soft cloth and mild soap is the whole regime; abrasive pads will dull the coating even though they will not scratch through it. For nano, avoid anything labelled descaling or limescale remover, which strips the film faster than normal use.

What to put in the specification

• Finish name plus process, not just a colour word. “Black PVD” and “black nano” are different products at different prices.
• Grain direction and grit for brushed units.
• Batch matching requirement where more than one unit ships.
• Abrasion or adhesion test data for any coated finish.
• Cleaning restrictions, printed on the packaging, not just in the catalogue.

If you are comparing two quotes and one is materially cheaper on a coloured finish, the difference is almost always the process. Ask which one it is before you ask for a discount. Our handmade sink range is available in all three finishes, and the handmade versus pressed comparison explains why the base bowl matters as much as the coating on top of it.