2026.01.31

PVD Black Stainless Steel Cladding: 10-Year UV Warranty Data Architects Actually Ask For

Black titanium cladding looks sleek on renders—but will it turn brown in the sun? We exposed 316L PVD panels to 10 000 h Q-SUN 340 (≈ 10 years South-Florida UV) and documented ΔE, gloss retention and film adhesion. Below are the numbers architects keep asking for—and the warranty small-print you can finally trust.

Test Set-Up: Q-SUN 340, 0.89 W/m²/nm @ 340 nm, 102 min light / 18 min spray, 63 °C BPT

Substrate: 316L 2B, 2.0 mm
PVD film: TiAlN 0.25 µm + 0.05 µm SiO₂ top-coat
Control coupon: raw 316L mirror

Key Results After 10 000 h

Property	0 h	10 000 h	Limit (AAMA 2604)	Pass?
Colour shift ΔE	0	0.8	≤ 5.0	✔
Gloss 60° retention	100 %	92 %	≥ 50 %	✔
Adhesion (cross-cut)	5B	5B	≥ 4B	✔
Chalk rating	10	9	≥ 8	✔

ΔE vs Time Curve

ΔE remains below 1.0 for entire 10 000 h Q-SUN test

What the 10-Year Warranty Actually Covers

Colour change: ΔE ≤ 2.0 for first 10 years (ISO 7724)
Film adhesion: no spontaneous peeling > 5 % panel area
Gloss loss: ≤ 30 % from original 60° reading
Exclusions: airborne cement, hydrofluoric acid, weld heat zones, abrasive cleaning

Spec Clause You Can Copy-Paste

PVD black stainless cladding shall be 316L min 2 mm thick, TiAlN film 0.25 µm with clear SiO₂ seal coat. UV resistance: ΔE ≤ 2.0 after 10 000 h Q-SUN 340 per ASTM G155. Warranty: 10 years colour, gloss and adhesion.