Unprotected brass left bare turns honey-coloured in six to twelve months in a dry interior and within a few weeks in a bathroom or by the sea, while fingerprints start showing within the first month. Brass protected with a PVD coating, typically between 0.3 and 1 micron, stays identical for ten years even on the most-handled handles in the hotel. In between sits clear lacquer, which costs little and lasts three to five years before it starts flaking at the corners. The decision needs to be made piece by piece, based on how many hands touch it and how close it sits to the sea.
Contents
What you’re actually buying when you buy brass
Brass is an alloy of copper and zinc, and the ratio between the two determines the colour: more copper, the warmer and more pink the tone. Two families dominate in furniture. Sheet and strip for cladding and profiles are generally CuZn37, what fabricators call OT63, while turned components such as knobs, bushes and feet are CuZn39Pb3, the free-cutting OT58, which carries 2.5 to 3.5% lead in the alloy to machine better and gives a slightly more yellow tone. The relevant product standards are EN 1652 for sheet and strip and EN 12164 for turning rod, and asking for them in a quote is the quickest way to tell whether a supplier knows what they’re buying.
There’s a distinction around lead worth pushing on in negotiations: nothing in the furniture itself is a concern, but anything carrying drinking water, meaning taps, fittings and flexible hoses under a basin, must be in alloys approved on European lists for contact with water intended for human consumption, with very low lead content. In areas with hard or chlorinated water, it’s also worth asking for dezincification-resistant brass, verified to ISO 6509, which allows a maximum dezincification depth of 200 microns.
The sheet thicknesses you come across in furniture are 0.8, 1, 1.5 and 2 mm. A band cladding on a counter is done with 0.8 or 1 mm bonded onto an MDF or plywood backing, because brass alone at that thickness dents and ripples. A structural profile, a table leg, the side of a trolley need 1.5 or 2 mm, or tube with a 1.5 mm wall. When a supplier proposes a 0.5 mm brass cladding on a wall that a luggage trolley will brush against every day, the dent arrives within the first season and doesn’t come back out.
Welds are the delicate point. On a polished brass frame the weld is always visible, however well it’s finished, because the heat-affected zone reflects light differently. On visible pieces it’s worth asking for hidden mechanical joints or 45-degree corners with structural bonding, and concentrating any welds where light doesn’t catch them.
Finishes: what gets touched and what gets looked at
Brushed brass has a direction, and that direction needs designing. On the front of a bar counter, horizontal brushing hides scratches from glasses resting on it, vertical brushing highlights them, and nobody notices until the piece is fitted. Fine satin is more uniform and more delicate. Mirror polish looks beautiful for a week, then shows every fingerprint, which is why in hotels it’s used on tall elements or behind glass.
Burnishing is achieved with chemical baths based on sulphides that darken the surface towards dark bronze or black, and it isn’t a uniform colour: it follows the metal, staying lighter on edges and deeper in recesses. On a burnished knob, a guest’s hand wears the burnishing away exactly where it grips, and after two years a lighter mark reads on the upper part. For many designers that’s exactly the effect they want. For a manager fielding complaints about “damaged handles” it’s a problem, and the difference between the two readings needs clarifying before signing, not after.
The matt black seen in recent years is almost never burnished brass: it’s powder coating on steel or aluminium. It resists scratching well but chips at the edges, and a chipped edge on matt black is visible from three metres away.
Protecting brass, or letting it live
The three routes are clear lacquer, wax and PVD.
Acrylic or polyurethane clear lacquer is spray-applied at 15-25 microns. It costs little, blocks oxidation and keeps the colour it had on delivery day. Its flaw is that it’s a film: once it wears through or gets scratched, oxygen gets underneath and the brass oxidises in a patch, with a sharp visible edge. On heavily handled pieces, working life is three to five years, after which they need stripping and redoing.
Wax leaves the surface alive and tactile, but it needs renewing every two or three months, and in a hotel that means adding one more line to the furniture maintenance schedule, assigned to someone who will actually carry it out. It works in small, well-run properties. In a hundred-and-twenty-room hotel, almost never.
PVD is physical vapour deposition: inside a vacuum chamber, a metal, usually titanium or zirconium, is vaporised and bonds to the surface forming nitrides. The coating is often just a few tenths of a micron thick, but it’s ceramic and reaches a hardness no lacquer can match, along with far better resistance to abrasion and corrosion than bare brass. Titanium nitride gives gold, zirconium nitride gives brass and rose gold tones, carbonitrides give bronze, gunmetal and black. Two numbers matter: thickness, between 0.3 and 1 micron in decorative applications, and hardness, between 1500 and 3000 HV against 200-500 HV for galvanic chrome plating. On handles, taps and visible hardware, it’s the best-spent money in the entire metals specification. In choosing furniture hardware, the finish matters as much as the mechanism, because the mechanism gets replaced, while the oxidised handle is what the guest looks at every time they open the wardrobe.
The opposite is also worth saying: bare, untreated brass is a legitimate choice if the property commits to it. The patina forms unevenly, darkening where nobody touches it and staying bright where hands pass, and within three years the piece tells the story of how it’s been used. This choice needs writing into the specification with wording stating that oxidation doesn’t constitute a defect, otherwise it becomes a dispute at inspection.
304 and 316 stainless: when those two points of molybdenum actually matter
AISI 304 and AISI 316 look identical and cost differently. The difference is molybdenum, present at 2-2.5% only in 316, which stabilises the passive film against chlorides. The summary parameter is PREN, calculated as the percentage of chromium plus 3.3 times the percentage of molybdenum plus 16 times the percentage of nitrogen: a 304 sits between 17.5 and 21, a 316 between 23 and 28.
In practical terms: inside a city hotel, 304 is fine everywhere, kitchens included. In a seaside property, in a spa with chlorinated water, in an indoor pool or a steam room, 304 develops what’s called tea staining within months, a brown haze that doesn’t undermine the structure but ruins the appearance and won’t come off with a sponge. There, 316 is needed. The reasoning around salt-resistant materials for seaside hotels starts from exactly this choice, and the most common mistake is fitting 316 for the structure and 304 for the screws.
AISI 430 is a ferritic grade, magnetic, nickel-free, and cheaper: found in economy cladding and the backs of appliances. In a humid environment it stains. Under a basin it makes no sense.
There’s a misconception about finish codes that’s been going around for years. The real designations under EN 10088-2 are 2B for matt cold-rolled, 2R for bright annealed, 1J and 2J for brushed, 2K for low-roughness satin, 2P for polished. The names you hear on site, meaning 4N, 8K, hairline, Scotch-Brite, are commercial names not contained in the standard. And EN codes describe the process, not the result: a 2J can have an average roughness anywhere between 0.2 and 1 micron, meaning it can be nearly smooth or clearly striated. On adjoining surfaces, roughness needs to be written into the specification as a value, with an approved sample attached, otherwise two sheets that are both compliant arrive visibly different.
Corrosion, tests, and what to write into the specification
The test that settles arguments is neutral salt spray under ISO 9227 NSS: 5% sodium chloride, a chamber at 35 degrees, counting how many hours pass before the first defects appear. Be careful how the result is read, because the standard doesn’t prescribe any duration and there’s no recognised conversion factor between chamber hours and years of service. It’s a comparative test: it’s useful for ruling out a supplier who won’t run it and for comparing two quotes, not for promising a lifespan. For a front-line seaside hotel, the serious reference is the atmospheric corrosivity classification under ISO 12944-2, where a seafront sits in category C5 or CX, with cycle durability declared by the coating applicator.
| Environment | Recommended metal | Protection | Salt spray to request | Cost order of magnitude vs powder coating |
|---|---|---|---|---|
| City hotel, interiors | brass or steel | clear lacquer or powder | 24-96 hours | reference |
| Room with heavily used hardware | brass | PVD | 96-240 hours | +25 to +50% |
| Spa, pool, steam room | 316 stainless | 4N or BA finish | 240-480 hours | +40 to +70% |
| Seafront, terrace, exteriors | 316 stainless or anodised aluminium | 20-25 micron anodising | 480-1000 hours | +50 to +90% |
| Non-visible technical areas | galvanised steel | 60-80 micron powder | 240 hours | below reference |
Aluminium deserves its own note, because it’s everywhere in contract furniture profiles and frames. Extrusions are in 6000-series alloy, almost always 6060 or 6063, and protection comes from anodising or powder coating. Architectural anodising classes correspond to 10, 15, 20 and 25 microns of average thickness, with a local minimum always a few microns lower, and none of these classes is called “marine”: choosing 20 or 25 microns on the coast is established practice, not a standard requirement. For powder coating, the number everyone looks at is thickness, generally above 60 microns, while the factor that actually decides how it holds up in a salt environment is pre-treatment: quality specifications for the coast call for a pre-treatment etch double the standard rate and a filiform corrosion test, and that’s what separates a profile that’s still intact after five years from one that lifts paint at the edges. Adhesion is checked with the ISO 2409 cross-cut test, where only grade 0 or 1 is acceptable.
One last point that causes damage on site: putting brass and aluminium in direct contact in a humid environment triggers galvanic corrosion, and it’s the aluminium that fails, pitting around the screw at rates measured between 0.17 and 0.95 mm a year depending on the area ratio between the two metals. Brass against stainless steel, by contrast, is almost harmless. The practical rule is that a small cathode on a large anode does little damage, while the reverse is a disaster: a galvanised steel screw on a stainless sheet holds up fine, a stainless screw on an aluminium profile needs isolating. Between dissimilar metals you need an insulating washer or a gasket, and when in doubt, coat both, never just the less noble piece. In mirror panels with a metal frame and in wall-hung bathroom furniture, this detail decides whether the fixing still holds after five years.
The cleaning products that ruin everything on top of them
The most concrete risk to a hotel’s metalwork isn’t humidity, it’s the cleaning trolley. Acidic limescale removers and descalers dull brushed brass in a single pass and permanently attack burnishing. Hypochlorite, meaning bleach, pits stainless steel and leaves marks that look like rust. Ammonia blackens brass. Abrasive pastes and green scouring pads strip PVD at the edges, where the coating is thinnest.
The operating rule to hand over to housekeeping is short: lukewarm water, neutral soap between pH 6 and 9, a soft cloth, immediate drying, never acidic or chlorine-based products on visible metal. Tap fitting manufacturers even advise against the more aggressive microfibre cloths, which leave micro-scratches visible against the light on dark finishes. On stainless surfaces near the sea, a fresh-water rinse at regular intervals is needed, every three to six months within five kilometres of the coast, because chloride deposited from the air keeps working even when the surface looks clean. The simplest rule to get followed is to wash the stainless steel whenever the windows get washed.
When a piece gets damaged anyway, the next question concerns spares and finishes still available years later. A rose-gold PVD handle from a discontinued range can’t be found again, and remaking just one isn’t economically sensible, so it’s worth buying a 3-5% stock of visible pieces from the outset and keeping it in storage. That’s a few hundred euros on a hundred-thousand-euro commission, and it’s the difference between replacing one handle and replacing eighty. When assessing a contract furniture supplier, asking how long they guarantee availability of metal finishes quickly separates someone working the project from someone selling off a catalogue.
On indicative 2026 costs, the picture is this. Brass tracks the copper price, which by summer 2026 had risen around 14% since the start of the year, and semi-finished sheet sells at around 10-12 euros a kilogram. A small-section brushed brass profile starts at 16-20 euros per linear metre and rises towards 60 on decorative sections. 316 stainless sheet costs 30 to 40% more than the same in 304, almost all of that difference down to the molybdenum. PVD costs little at large industrial volumes, where the process adds cents per piece, and a lot on small subcontracted runs, where it can reach figures in the order of five to fifteen euros per piece: on a decorative sheet, the premium over bare metal sits between 50 and 100%.
Frequently asked questions
Can brass be used in a seaside hotel?
Yes, but protected and not outdoors. Indoors, with PVD or clear lacquer in good condition, brass holds up without problems even in a seaside property. On terraces, pergolas and furniture exposed to sea spray, it’s worth switching to 316 stainless or aluminium anodised at 20-25 microns.
Can PVD be touched up if it gets scratched?
No. The coating forms inside a vacuum chamber at high temperatures, so there’s no on-site touch-up: the piece has to be removed and redone, or replaced. That’s why it’s worth ordering a small stock of spares from the start for elements finished in PVD.
How do you tell solid brass from brass-plated steel?
With a magnet: brass isn’t magnetic, brass-plated steel is. Weight is the other clue, because brass is noticeably heavier for the same volume. On the edges and holes of a plated piece, the colour of the underlying metal is often just visible.
What’s the difference between burnished brass and antiqued brass?
Burnishing is a chemical process that darkens the metal’s tone in depth, following the surface. Antiquing is usually burnishing followed by selective brushing, which brings the edges back into the light and creates the contrast typical of well-used pieces. The second is more stable in appearance because the variation has already been created during manufacturing.
How long does a clear lacquer finish on brass last?
Three to five years on heavily handled pieces such as handles and knobs, much longer on elements that are only looked at, like profiles and trims. The sign it’s reaching the end of its life is dark marks appearing with a sharp edge, indicating oxidation under the film: at that point it needs stripping and redoing, because applying more clear lacquer on top only makes the appearance worse.
