Specifiers who treat stainless steel as a single “silver metal” leave money, performance and curb-appeal on the table. In 2025, more than 300 validated surface options—mill, mechanical, physical and chemical—give façades radically different reflectivity, roughness and corrosion behaviour. This cheat-sheet compresses 18 months of Google Stainless-Steel R&D into a 10-minute read you can forward to any design team.
Optical comfort: low-glare < 20>
Soiling cycle: smoother surfaces (Ra ≤ 0.2 µm) reduce cleaning cost −40 % over 20 years.
Corrosion anchor: properly bead-blasted 316L can survive C5-M coastal zones without extra coating.
Photo-voltaic integration: selective PVD tints raise BIPV visual acceptance by 28 %.
| Family | Ra (µm) | Typical Process | 2025 Lead-Time |
|---|---|---|---|
| Mill (2B, 2R, HL) | 0.1 – 0.5 | Cold-roll + anneal | 1 week |
| Brushed (#4, #6) | 0.2 – 0.4 | 120–240 grit belt | 3 days |
| Bead-blast | 0.3 – 1.2 | Glass bead 53–106 µm | 5 days |
| PVD coated | 0.05 – 0.3 | Plasma deposition 200 °C | 7 days |
| Embossed | 0.4 – 1.5 | Roller coining | 10 days |
Black Titanium PVD – ΔE < 0>
Low-glare Nano-Bead – 12 GU, anti-fingerprint, specified for elevator lobbies.
Anti-microbial Copper-PVD – 99 % MRSA kill in 2 h; hospitals.
Champagne Rose – warm metal without gold price volatility.
Velvet embossed 5WL – hides minor panel dents; airports.
Raw Hairline 240# – still the safest value for high-traffic railings.
Oil-rubbed Bronze – PVD + nano-oxide over 304; interior feature walls.
Matte 2B – solar reflectance 55 %, BREEAM HEA 04 credit helper.
Reflective 2R – mirror-like 80 GU, used for landmark “infinity” corners.
Perforated + PVD – 35 % open area, 50 % shade, zero colour fade.
Coastal (C5-M): 316L + nano-bead ≈ +18 % vs. standard 2B; life-cycle cost beats painted carbon steel 5×.
Desert (C3): 430 ferritic + embossed saves 22 % material cost, no chloride issues.
Tropical urban (C4): 304 PVD black titanium balances price & glare control; pay-back 6 years via cleaning reduction.
Drag-and-drop any finish; Ra, gloss, LCA data auto-populate.
One-click generate 4×4” labelled samples; ships in 48 h.
Exports COBie & IFC for facilities management.
Get the Sampler: Order your free 4×4” finish kit (300+ options) and we’ll ship it carbon-neutral within 48 hours—perfect for early-stage façade workshops.
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