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Curtain Walls

Super-durable performance and appearance stability for premium facades

Curtain walls include metal curtain-wall panels, aluminium sheets and other facade elements for high-rise buildings. Direct exposure to rain, ultraviolet radiation and atmospheric pollutants creates demanding super-durable weathering requirements.

Veri Coating offers super-durable polyester-HAA smooth and TGIC textured powders with at least 90% gloss retention after 1,000 hours of xenon-arc exposure, targeting Qualicoat Class 2 or AAMA 2604 where stated in the selected TDS.

Application notes: Decorative surfaces should be protected from contamination and scratches, while film thickness, curing and colour difference must be tightly controlled; the recommended film thickness is 60-120 um.

Typical Powder Coating Challenges for Curtain Walls

Insufficient Long-Term Exterior WeatherabilityLong-term exposure causes gloss loss, fading and chalking, requiring a higher weathering class.

Insufficient Long-Term Exterior Weatherability

Curtain-wall panels can lose gloss, fade, chalk or become brittle after prolonged exposure to ultraviolet radiation, rain, temperature variation and pollution. A standard-durable system used in a high-irradiance region or beyond its intended design life may fail prematurely despite acceptable initial performance.

Formulation Design

  1. For premium curtain walls, prioritise a super-durable polyester system with highly weatherable pigments, resins and stabilisers.
  2. Validate metallic and low-gloss formulations separately; their weathering performance cannot be inferred directly from solid high-gloss systems.

Process Control

  1. Select Class 1 or Class 2 according to project location, orientation, colour and design life.
  2. Strictly control pretreatment, film thickness and actual part temperature to prevent undercure or overbake.
  3. Retain reference samples and batch traceability, combining natural exposure and accelerated weathering where necessary.
Validation Focus
  • Xenon-arc weathering
  • Gloss retention and colour difference
  • Condensation/damp heat
  • Natural-exposure comparison
Large-Area Colour and Gloss VariationHue, brightness or gloss variation across large façade panels becomes more visible after installation.

Large-Area Colour and Gloss Variation

A small approval panel may pass inspection while the installed curtain wall shows panel-to-panel colour variation, uneven gloss, orange peel or directional differences. Common causes include batch variation, film-thickness differences, uneven oven temperature, changes in spray direction and metallic-pigment orientation.

Formulation Design

  1. Improve formulation batch consistency by controlling pigment dispersion, particle size and the matting system.
  2. Minimise cross-batch supply on large projects; for metallic effects, prefer a bonded system and lock the approved standard panel.

Process Control

  1. Standardise substrate batches, pretreatment, hanging orientation, gun settings and cure profiles.
  2. Plan production batches by façade elevation zone to avoid mixing batches within one field of view.
  3. Combine instrumental colour and gloss measurement with visual assessment in the actual installation orientation.
Validation Focus
  • Panel-to-panel colour difference
  • Gloss variation
  • Oven-temperature uniformity
  • Visual consistency in installation orientation