Powder coating is the most common finish for aluminium windows, doors and facade profiles in India. The metal is first cleaned and given a conversion pretreatment, traditionally chromate based and increasingly chrome-free, to promote adhesion and corrosion resistance. Charged powder, usually polyester for outdoor use, is sprayed on and then cured in an oven, where it melts and cross-links into a continuous film. Super-durable and PVDF liquid coatings are used where higher weathering resistance is needed.
Why it matters when buying
- Pretreatment quality decides long-term performance; ask what system is used and how it is controlled.
- Specify colour (RAL or shade card), gloss, film thickness in microns and the weathering class of the powder.
- Check adhesion, film thickness and colour consistency on delivery, and look for orange peel or bare spots.
- Painted profiles become painted extrusion scrap at end of life, which recovers less metal than bare scrap because the coating burns off.
Typical uses
Architectural extrusions, façade and ACP systems, furniture, solar structures and enclosures. Compare with anodising. Browse extrusions.