Granite® HDXtreme

Organic coated steels

Granite® HDXtreme - Extremely beautiful, extremely durable

Technical information

Granite® HDXtreme already exceeds the requirements of the recently published EN 10169-2021 in terms of corrosion and UV resistance. Its exceptional UV resistance offers colour stability for many years.


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

Colours and 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 EN 10169-2021

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 EN 10169-2021

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 with outstanding durability performances. 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, even those near the sea - but also in other 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 contributes to durability and provides the final colour. The coating is finished with a layer of varnish which adds texture to the coating, reinforces 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. It can also be used in combination with perforated metal.

Video: Build to the shore

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