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A Kingspan director has denied that his failure to mention a rigged cladding test at a previous hearing of the Grenfell Inquiry was an attempt to mislead the public.

Adrian Pargeter, the Irish insulation giant鈥檚 UK director of technical, marketing and regulatory affairs, said that his 鈥減owers of recollection鈥�deserted me鈥� during the hearing in December last year.

Pargeter had failed to mention a May 2018 test on a non-combustible cladding system which Kingspan had engineered to fail as part of a lobbying campaign to persuade the government not to ban combustible cladding systems.

The intention was to show that non-combustible systems could also be dangerous by presenting the failed test results to a select committee of MPs investigating the dangers of cladding systems in the aftermath of the 2017 Grenfell Tower fire.

But despite internal Kingspan emails showing that flawed vertical cavity barriers had been installed in the test rig to allow flames to spread up the cladding system, the test had accidentally passed.

Asked by counsel to the inquiry Richard Millett QC if the unexpectedly successful result of the test 鈥渄ealt something of a blow鈥� to Kingspan鈥檚 lobbying strategy, Pargeter admitted that it had been 鈥渁 disappointment鈥�.

Millett then asked: 鈥淒oes it remain your evidence that, despite your involvement in setting up the test, the money spent on it, in which you were involved, the surprise and inconvenience of the test passing and the blow that it dealt to your case message, you鈥檇 never recalled the successful May test when you were giving evidence on December?鈥�

Pargeter replied: 鈥淣o, I didn鈥檛. I didn鈥檛 recall it鈥�there鈥檚 no advantage to us, no purpose for us, for me forgetting about that at all.鈥�

He added: 鈥淲hat other reason would I have for withholding that? It doesn鈥檛 make sense.鈥�

Millett suggested that one reason might have been that before the December hearing, Pargeter had neither disclosed any documents nor mentioned 鈥渆ven the existence鈥� of the test and the 鈥渂low that it dealt鈥� to Kingspan鈥檚 case.

Asked if this would be a 鈥済ood reason鈥�, Pargeter said that he 鈥渨ouldn鈥檛 have thought that鈥�.

After the result of the May test, Kingspan鈥檚 managing director Gilbert McCarthy sent an email shown to the inquiry which said that the firm鈥檚 chief executive Gene Murtagh was 鈥渧ery clear that we need to pull out all the stops to convince the [the government] and anyone who wants to listen, as many independent experts and trade associations as possible, that large scale testing for everything above 18 metres is the 鈥檙ight and only鈥� solution to ensuring maximum future public safety鈥�.

The inquiry has already heard details of a second test carried out by Kingspan in July 2018, using a rival cladding product branded Vitracore G2 which was suspected to be likely to fail a large-scale test despite being rated a product of 鈥榣imited combustibility鈥�.

The test resulted in the desired outcome of a failure, which Kingspan then passed on to both the government and the select committee, as well as the BBC.

But they did not disclose the details of the earlier May test, with Pargeter admitting to yesterday鈥檚 hearing that Kingspan had 鈥渢old no one of its existence鈥�.

Millett asked: 鈥淚 have to put it to you that in not revealing the successful May test to the select committee, Kingspan was attempting to mislead the select committee?鈥� Pargeter replied: 鈥淣o, I disagree.鈥�

Millett then put it to Pargeter that the reason he had not mentioned the May test to the inquiry was for the same reason: 鈥測our plan was always to conceal the fact of and result of the May test from both the Inquiry and the public.鈥� Pargeter said that this was not true.

Millett then said: 鈥淎nd it was only once it had been put to you in evidence that the July test was similarly part of an attempt to mislead the select committee that you chose to come clean, as you would have it, about the May test and sought to put the record straight.鈥�

Pargeter again denied this and said it was not true.

After being told about the July test, the government carried out further tests on Vitracore G2 which confirmed that the version of this product being sold on the market was different to what had been tested because it contained more adhesive in its bonding.

The hearing was shown internal Kingspan emails from September 2018 in which staff said that the government had 鈥渒illed鈥� the May test, adding that this had been 鈥渙ur most powerful test鈥�.

Asked by Millett if Pargeter understood this to mean that the government鈥檚 actions had made the July test 鈥渦seless for Kingspan鈥檚 lobbying purposes鈥�, Pargeter replied: 鈥淧otentially.鈥�

The inquiry has already heard that the version of Kingspan鈥檚 K15 insulation, which was found to have been included in the cladding system of Grenfell Tower after the fire which claimed 72 lives in June 2017, on the market was also different to what had been tested.

Kingspan had changed the chemical composition of the insulation in 2006, a year after the successful 2005 fire test which was then used in the product鈥檚 marketing literature for nearly fifteen years before the test report was withdrawn in October last year.

A 2007 fire test of the newer, changed version of K15 had turned a laboratory into a 鈥渞aging inferno鈥� which had to be extinguished before the end of the test out of fears that it would endanger the laboratory.

The first phase of the inquiry found that the insulation products in the tower鈥檚 cladding system, which also included Celotex鈥檚 RS5000, 鈥渕ore likely than not鈥� contributed to the rapid spread of flames up the side of the building.

The inquiry continues.