UV Stable RAL 9002 Color Coated Steel Coil with Anti Chalking Polyester

UV Stable RAL 9002 Color Coated Steel Coil with Anti Chalking Polyester

This RAL 9002 grey white color coated steel coil is produced on a continuous coil coating line using a Z275 hot dip galvanized substrate. The coating system pairs a chromate free pre treatment with a high solids polyester primer and a UV stabilized top coat that resists chalking, gloss loss and shade drift. Because the pigment package is selected for exterior exposure rather than interior decoration, the coil keeps a stable light grey white appearance on facades, roof panels and wall cladding where daily solar radiation would quickly bleach a standard decorative finish.

Each coil is cured in a multi zone oven, so the top coat reaches full cross linking before recoiling. That curing discipline is what separates a coil that still looks even after eight summers from one that turns chalky white in the second year.

Specification Parameters

Why This Coating System Holds Its Color

• UV stabilized resin package slows photo degradation, so the surface does not turn chalky under strong summer sun.
• Anti chalking pigment selection keeps the grey white shade from drifting toward yellow over time.
• Z275 zinc substrate provides sacrificial protection at cut edges and profile bends.
• Chromate free pre treatment improves wet adhesion, which is the main cause of early peeling on coastal sites.
• Controlled gloss range reduces the washed out look that high gloss decorative coatings develop after weathering.

Where It Is Used

• Exterior facade cladding and rainscreen panels
• Roll formed roof sheets for warehouses and workshops
• Wall panels for modular buildings and site offices
• Trim, flashing and ridge caps formed from the same coil batch

Frequently Asked Questions

How long will RAL 9002 keep its color outdoors?

In a C3 inland environment the UV stable polyester system typically holds color and gloss for 20 to 25 years. On coastal or industrial sites with salt and chemical exposure we recommend moving to a higher build coating and shortening the inspection cycle to once every two years.

Can the coil be roll formed after coating?

Yes. The T bend 2T result means the coating survives a 180 degree fold over a two thickness radius. Standard trapezoidal and corrugated profiles are well within this limit, and the primer system is designed for the elongation that roll forming demands.

Is the pre treatment chromate free?

Yes, we use a chromium free passivation so the finished coil meets RoHS requirements for exported building products. Please confirm your destination market regulations when ordering, since some projects still specify conventional pre treatment.

Do you supply matching accessories from the same batch?

We keep the parent coil batch record, so ridge caps, flashings and edge trims produced from the same melt stay visually consistent. Give us the accessory list with the coil order and we schedule them together.

Coating thickness matters more than coating brand in service: Top 20 - 25 micron, primer 5 micron, back 7 - 10 micron. Below roughly 20 micron total build, UV exposure in strong sun starts to chalk the surface within a few years, and the colour drifts before the steel itself shows any problem.

Formability is specified as T bend 2T, no coating crack. This determines whether the strip can be roll formed and folded at the job site without cracking the coating over the bend radius, which is the most common cause of premature coating failure on roofing panels.