Granite® HDXtreme

Organic coated steels

Granite® HDXtreme - Extremely beautiful, extremely durable

Technical information

Granite® HDXtreme already exceeds the requirements of the latest European standards. Its exceptional UV resistance offers colour stability for many years.


  • Steel thickness of 0.30 to 1.8 mm
  • Steel width of 660 to 1500 mm (larger widths upon request)

Colours & appearance - colour palette:

  • Satin (15 and 30 GU) grained
  • Matt (<10 GU) fine wrinkle
  • Sparkling (30 GU) grained

Most important properties:

  • Very good UV resistance & remarkable corrosion behaviour for all shades
  • Very good formability & robust coating
  • Full thermosetting paint system
  • Surface treatment and paint: free of hexavalent chromium and heavy metals

Key performances:

  • Adhesion of the coating (T-bend) ≤ 1 T
  • Resistance to cracking on bending (T-bend) ≤ 1.5 T
  • Impact resistance 18 J
  • Clemen scratch resistance ≥ 3.5 kg

Corrosion resistance:

  • Salt spray test of 1000 hours
  • Corrosion resistance category RC5+ (provisional) - category included in the EN 10169 revision

Condensation resistance:

  • QCT test 1500 hours
  • Corrosion protection (interior) category CPI4

UV resistance:

  • QUV (UVA + H2O) test (4000 hours) ΔE ≤ 2; GR ≥ 80%
  • UV resistance category RUV5 - category included in the EN 10169 revision

Satin colours ‘X’

Matt colours ‘M’

Sparkling colours ‘S’

Designed for extreme environments - the most durable organic coating

Granite® HDXtreme is the latest prepainted steel in our organic coated Granite® range. It has a coating system that provides high levels of protection against UV and corrosion.

It has been designed for use in extreme climates - on roofs and facades of buildings near the sea - but also in severe indoor environments, such as swimming pools or waste management plants.

The strength of Granite® HDXtreme comes from its three-layer coating system. Each layer performs a different but integral function. The primer layer plays a key role in corrosion protection. On top of that is a basecoat, which ensures the steel’s durability and provides the final colour. The coating is finished with a layer of varnish which adds texture to the coating, increases durability and surface robustness, and enhances the UV weathering potential of Granite® HDXtreme.

Created in consultation with architects and designers, Granite® HDXtreme is available in a huge palette of colours and three different finishes: satin, matt and sparkling.

Our extensive experience and testing, including in highly corrosive seafront locations, translates into a long-term guarantee of up to 40 years for Granite® HDXtreme. The guarantee is applicable to roofs and facades as well as the installation of rooftop photovoltaic modules plus indoor applications.

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Facades and roofing - our latest innovations in prepainted steels to meet the new requirements

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