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Benefit
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Which
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Notes
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| Proven durability, anodising has been in use architecturally for 50 years plus. | Client has more comfort that in the long term his building will last. | Polyester Powder coating has now field experience of approx. 20 years. |
| Anodising is integral with the metal not an applied finish. |
No possible adhesion or joint corrosion problems. Not susceptible to filiform corrosion. |
Properly done green chromate pre-treatment prior to PPC has been very successful in UK. |
| Finishes can be completely fade-free. | There will be no colour change whatsoever over the life of the building. | All organic coating finishes change with time. |
| More scratch and abrasion resistant. | Less prone to damage particularly in high traffic areas. Also neglected finishes can be restored by abrasive cleaning (Scotch brite). | Properly processed anodising is harder than glass. Indeed it is not scratched by glass paper. |
| Resistant to filiform corrosion Metallic Lustre. | No performance concerns, particularly in coastal environments. As the film is transparent the aluminium substrate shows through giving metallic look. | Concerns, particularly in mainland Europe, on PPC performance. Metallic powders are available which attempt to replicate this. |
| Resistant to Chloride & Sulphate. | More durable in city and marine atmospheres. | All organic coatings are permeable. |
| Film thickness is more controllable 25µ-35µ rather than 40µ à 120µ | Pieces fit together more easily and sharp corners on extrusions are retained which is aesthetically more pleasing. | The skill of the powder coater can reduce spread. |
| Tests are mainly non- destructive. | High percentage can be properly checked either in plant or on site giving client comfort. | Tests on Polyester Powder coating for adhesion and cure must be done on sample panels and not on the actual job. |
| Anodising is a dip rather than a spray process. | Better overall coverage of extrusion profile. | Even non-seen faces have good durability. |
Benefits of Anodising over PVF2
In addition to the benefits over PPC the benefits over PVF2 are:
| Rejected components can easily be stripped and reprocessed in plant. | Internal rejects can be reprocessed | Recoating, with its inherent adhesion problems, is the only solution on PVF2 |
| Solvent free | No harmful VOC's used | Environmentally better |
| Much more scratch resistant | Less site damage | PVF2 is softer than PPC, which is much softer than anodising. |