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The makers of the combustible ACM panels blamed for the rapid spread of fire at Grenfell Tower threatened to cut ties with a testing house unless the panels were approved, the inquiry has heard.

Arconic had been in talks with the British Board of Agr茅ment (BBA) to secure a Class 0 rating for its polyethylene-filled Reynobond PE panels to stamp them as safe for use on high rise buildings in the UK.

Thursday鈥檚 hearing was shown internal notes from the meetings, which were produced by Arconic, showing that in November 2006 the firm had issued a 鈥渢hreat to stop all dealings with BBA unless a satisfactory solution was found鈥�.

The meeting notes concluded that 鈥渉ard tactics may have helped our situation鈥�.

Arconic was successful in obtaining a certificate from the BBA which stated that its Reynobond PE panels 鈥渕ay be regarded鈥� as achieving Class 0, which the inquiry has already heard was seen by the manufacturer as crucial to its sales in the UK.

Several witnesses at the inquiry have said that the certificate had reassured them that the ACM panels were safe to use on the refurbishment of Grenfell Tower.

But the certificates were based on incomplete data from a pair of European tests in 2005 which had given two versions of the product 鈥� Reynobond PE and a more fire resistant, expensive variant called FR 鈥� the Euroclass B rating, which is the equivalent of the UK Class 0.

These tests had been carried out on versions of the products designed to be installed with rivets.

The inquiry has heard that another version designed to be folded into cassettes and hung on rails 鈥� the type used on Grenfell Tower 鈥� had 鈥減erformed disastrously鈥�, releasing seven times more heat and three times as much smoke than the riveted version.

This test had produced a Euroclass E rating, which the inquiry heard yesterday was close to 鈥渟pontaneous combustion鈥�.

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

Arconic president Claude Schmidt denied last month that the firm鈥檚 failure to provide the BBA with the full test data had been 鈥渄eliberate concealment鈥�, adding that the BBA 鈥渃ould have found out鈥� about the results in an audit 鈥� although he did admit that it had been a 鈥渕isleading half truth鈥�.

Former BBA project manager Hamo Gregorian told the inquiry yesterday that he could not remember the details of the meeting with Arconic which the manufacturer had described as featuring 鈥渉ard tactics鈥�.

Inquiry counsel Richard Millett QC asked: 鈥淐an you help us with what is meant there by 鈥榟ard tactics鈥�?鈥�

Gregorian replied: 鈥淣o, I can鈥檛 remember the details of this meeting at all,鈥� adding: 鈥淥bviously, I mean, marketing were involved in this, and it must have emanated from marketing.鈥�

It was also revealed that after the meeting the BBA had discounted the cost of its services from 拢24,000 to 拢16,500.

Around 3,000 sq m of the cassette version of the product were sold to the Grenfell Tower refurbishment project.

The inquiry has already found that the ACM panels installed on the 67m tall tower were the 鈥減rimary cause鈥� of the spread of the fire in June 2017, which claimed 72 lives.

The inquiry continues.