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It was the 鈥渞esponsibility of others鈥� to ensure the materials used in the refurbishment of Grenfell Tower complied with building regulations, the maker of the cladding panels has said.

Arconic told the inquiry into the fire in June 2017 that the project team behind the tower鈥檚 disastrous refurbishment had 鈥渇ailed to adequately analyse the regulatory regime and to determine how they were to comply with it鈥�.

The firm, which was making closing statements for the inquiry鈥檚 modules looking at the refurbishment and the materials used, manufactured the combustible ACM panels used in the building鈥檚 cladding system.

The first phase of the inquiry found that the cladding acted like a 鈥渟ource of fuel鈥� for the fire, which ripped up the sides of the tower, leading to the deaths of 72 people.

Arconic also 鈥渆mphatically rejected鈥� that it had misled the British Board of Agrement (BBA), a certifying body, about the performance of the panels in fire tests. It said the wording of the certificate 鈥渨as the responsibility of the BBA and was not misleading鈥�.

The panels, known as Reynobond PE, were used on Grenfell Tower in a form which was fabricated into cassettes and hung on rails.

The inquiry has already heard that, while another version of the panels which were attached to walls with rivets had achieved a Euroclass B rating in fire tests 鈥� allowing them to be used on buildings above 18m 鈥� the cassette form had performed 鈥渄isastrously鈥� in a failed 2005 test, achieving a Euroclass E rating.

But Arconic had only supplied the results of the tests on the riveted version of the product to the BBA, with the inquiry hearing in February that staff at the firm believed the results of the test on the cassette version had been a 鈥渞ogue result鈥�.

Arconic argued in its closing statement yesterday that the panels, which were supplied to customers in an unfabricated form, were 鈥渃apable鈥� of achieving a Euroclass B rating.

It admitted that this did not mean that the rating would be achievable in all circumstances, adding that the BBA and Arconic were 鈥渇ully entitled to proceed on the basis that those to whom the panels were supplied would take responsibility for assessing the fire performance of the chosen fabrication鈥�.

And it said that it would be 鈥渋llogical and inappropriate鈥� to impose any wider responsibility upon the BBA or Arconic in relation to how the panels were fabricated or used.

It added that it was 鈥渦nnecessary鈥� for the BBA certificate to make reference to the different reactions to fire of the panels depending on whether they were in rivet or cassette form.

The closing statement concluded that it would be 鈥渨rong and unfair鈥� for the inquiry to pin blame for the fire on Arconic, as those who had carried out the refurbishment of the tower had failed to apply the regulatory regime to their work.

In March, the inquiry heard how Arconic had ignored at least 11 separate written requests by the BBA for information about changes to the product that would affect the certificate for the panels.

The BBA eventually renewed the certificate based on information on Arconic鈥檚 website. The body was not told that the fire rating of the riveted form of the panels had in fact been downgraded from Euroclass B to C in 2014, and the cassette form confirmed with an E rating.

BBA chief scientific officer John Albon admitted that the BBA鈥檚 failure to insist on the information from Arconic was 鈥渁 very basic failure of due diligence鈥�.

But he added: 鈥淚 don鈥檛 think our procedures anticipated a situation where there would be deliberate misrepresentation of the performance of the product with a fire safety-critical aspect of performance such as this.鈥� 

The inquiry has also heard how Arconic manager Claude Wehrle warned colleagues two years before the fire that Reynobond PE was 鈥渄angerous鈥� and should be swapped for a safer fire-retardant version 鈥渁s a matter of urgency鈥�.

And the firm was warned as early as 2007 that the panels could be deadly, with marketing manager Gerard Sonntag describing how a cladding expert at an industry event had said that 5,000m² of ACM would have the same 鈥渇uel power鈥� as a 鈥渢ruck of 19,000-litre oil鈥� in the event of a fire.

The next module of the inquiry will focus on how central and local government responded to the disaster.