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Polish roofing producer puts Granite® Ultramat to the test

Blachdom Plus, a producer of steel roofing solutions in Poland, is currently testing Granite® Ultramat from ArcelorMittal Europe – Flat Products. But this is not the first time the company has run real-life production tests on new products from ArcelorMittal. For Blachdom Plus, trials such as this give them early access to solutions which will be attractive to their customers, and a competitive advantage when it comes to understanding the technical performance of the material.

Matt coatings are very popular with Blachdom Plus customers, making Granite® Ultramat a natural fit for their product portfolio. But it is the variety of solutions that makes the Granite® range so interesting for the company, as Dariusz Ceglarz, Commercial Director for Blachdom Plus explains: “Each of the products that ArcelorMittal provides for us is characterised by a different surface appearance: glossy, matt, mineral… And each has different technical parameters such as coating thickness or type. That gives us solutions for specific parts of the building’s exterior.

Visual and production tests carried out

The first tests on Granite® Ultramat were carried out by Blachdom Plus in October 2018, though preparations had begun months before. The test coil was produced at ArcelorMittal Eisenhüttenstadt (Germany) and shipped to Poland. Piotr Szafarczyk, the ArcelorMittal client technical support manager for Blachdom Plus, travelled to the customer to observe the trial.

“After unpacking, the first step was visual and comparative assessment against a sample of Granite® Deep Mat we had in stock,” says Dariusz Ceglarz. “The Granite® Ultramat coils were then processed into four of our roofing tile products: Amalfi, Beskid, Bona, and Perła. These particular sheet tiles have two of the most demanding processing steps: profiling on rolls and drawing.”

Blachdom Plus also carried out bending tests on equipment used to produce flashings, and on production lines for trapezoidal sheets and ridge tiles for roofing applications.

Samples of Granite® Ultramat first underwent visual and comparative assessment

Results prove promising

The first results are promising says Dariusz Ceglarz: “The visual test showed that Granite® Ultramat is characterised by a large grain. The coating is rough and expressive to the touch, which translates into a good, homogenous, visual aspect. The production line tests also passed without problems. Granite® Ultramat maintained its continuity and adhesion throughout.

Further tests are planned notes Dariusz Ceglarz: “The information we have from ArcelorMittal’s technical support department is that Granite® Ultramat performs better than other products when stored and processed at low temperatures. We aim to test this during the coldest part of the production season which is coming up soon.”

Blachdom Plus tested the material in a range of equipment

R&D tests to check performance

Samples of the material Blachdom Plus processed have been sent to the ArcelorMittal Global R&D team so several scientific tests can be performed. “We expect the feedback will be positive,” says Dariusz Ceglarz. “Once we get confirmation of the material’s resistance to corrosion and ultraviolet (UV) light, we will gladly recommend Granite® Ultramat to our customers.”

Granite® Ultramat’s resistance to corrosion is expected to be RC4, while its resistance to UV light is expected to be RUV4. “If these values are achieved, it will allow us to extend our warranty conditions for tiles,” says Dariusz Ceglarz.

Will Blachdom Plus take part in future trials of ArcelorMittal solutions? “These are not the first tests we have done with ArcelorMittal,” says Dariusz Ceglarz. “A few years ago we tested Granite® Quartz which is now part of our regular offer. We can see effects of these trials and the benefits they bring for both sides – it is worth the effort. And of course, we are open to new testing challenges.”

Blachdom Plus produces roofing in a wide range of shapes and profiles

About Blachdom Plus

Blachdom Plus is a producer of coated sheet products for roofing and facades. Formed in 2006, the company is based in the province of Silesia in southern Poland and employs around 120 people. Blachdom Plus has two production plants in Poland in Rybarzowice and Wrocław. The two plants include seven lines for roof tile profiling, six lines which profile trapezoidal sheets, and two lines to produce standing seam roofs. While Poland is the main market for Blachdom Plus, the company also exports to the Czech Republic, Hungary, Slovakia, and other countries. Blachdom Plus also operates 22 sales branches and has an extensive network of independent distributors in Poland and abroad.

The company now offers five Granite® finishes including Deep Mat, HDX, Quartz, Standard, and Storm.

More info on Blachdom Plus:

Blachdom Plus is a major producer of roofing solutions in Poland

Sheets of roofing tiles made of ArcelorMittal steel

Some of the most beautiful roofs made by Blachdom Plus with Granite® Deep Mat, HDX, and Storm


Granite® Ultramat: safe for 20 years and more

Granite® Ultramat is the latest addition to ArcelorMittal’s Granite® range of organic coated steels for outdoor building applications.

  • Designed specifically for roofing.
  • Advantages over standard Granite® Deep Mat and competing products thanks to the high quality and flexibility of the paint system used.
  • Wrinkled finish, available in 11 colours.
  • Good formability at low temperature and after cold storage.
  • Improved scratch resistance.
  • ArcelorMittal Europe – Flat Products is expected to offer guarantees of up to 20 years on non-perforation and up to 15 years for non-delamination. Granite® Ultramat’s aesthetic properties are expected to be guaranteed to up to 10 years.
  Technical data sheet


Related links

Blachdom Plus
More info on ArcelorMittal’s Granite® Ultramat
Contact ArcelorMittal Europe – Flat Products
Steel for construction at


Copyright images: Piotr Szafarczyk (ArcelorMittal) and Blachdom Plus