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An Arconic technical manager described the firm as 鈥渘ot clean鈥� to a sales executive who had been trying to sell the same type of combustible cladding panels used on the Grenfell Tower鈥檚 refurbishment, the inquiry into the west London fire has heard.

Thursday鈥檚 hearing was shown emails in the summer of 2010 between technical manager Claude Wehrle and sales executive Isabel Moyses in which Wehrle made the warning after the client had insisted on seeing test reports for Arconic鈥檚 Reynobond PE cladding product in its cassette form.

Moyses was in talks with the client, Bruno Costa, about the fire safety of the Reynobond PE cassettes, which had failed a 2005 fire test for use on high rise buildings.

The inquiry has already heard how the cassette form of the cladding, which was folded and designed to be hung on rails, had burned 鈥渄isastrously鈥� in tests and achieved a Euroclass E standard, prohibiting its use on high rise buildings.

Another version, which was designed to be riveted to walls, had performed much better and achieved a Euroclass B rating, which meant that it could be sold on the high rise market.

But when Costa had asked for the test reports of the cassette version, which he wanted to purchase, Moyses instead sent him the test reports for the riveted version on the basis that this was the 鈥渕ost unfavourable system鈥� so would also cover the fire performance of the cassette version.

Moyses emailed Wehrle: 鈥滲runo (absolutely) wants the certificate. Fire for the PE for the cassette system. We forwarded the Euronorm (riveted system) and mentioned that since it is the most unfavourable system, it is also acceptable for the cassette system. Unfortunately that鈥檚 not enough鈥� he wants a document鈥� can you please take care of it?鈥�

Wehrle then replied to Moyses: 鈥滻t鈥檚 hard to make a note about this鈥� Because we鈥檙e not 鈥檆lean鈥欌�︹��

Wehrle then followed up with Costa, sending him a document which claimed that the riveted version  - which had passed the 2005 fire test - was the 鈥渨orst case鈥� of the product as its combustible polyethylene core was exposed, compared with the cassette version - which had failed its fire test - as its core was 鈥減rotected鈥�.

Wehrle is one of three Arconic staff who have refused to appear at the inquiry under French legal advice, although he has supplied email exchanges and a witness statement.

Lead counsel to the inquiry Richard Millett has instead been questioning Arconic president Claude Schmidt.

Millett asked Schmidt what test there was that showed the cassette version of the cladding performing better than the riveted version, to which Schmidt admitted: 鈥淭o my knowledge, there isn鈥檛 one.鈥�

Millett then asked: 鈥淒o you accept that in telling Mr Costa that rivet was worse than cassette for the purposes of fire performance, Mr Wehrle lied to him?鈥�

Schmidt replied: 鈥淵es.鈥�

The inquiry heard earlier this week that technical staff at Arconic had been 鈥減uzzled鈥� by the 2005 test failure of the cassette version - believing that it was a 鈥渞ogue鈥� result as the firm had a 鈥済eneral view鈥� that it would perform better under testing than the riveted version.

But Schmidt was then shown emails - which have previously been seen by the inquiry - in which Wehrle, referring to the cassette鈥檚 fire performance, said: 鈥渢his shortfall in relation to this standard is something we have to keep as VERY CONFIDENTIAL!!!!鈥�

Millett asked Schmidt if this email showed that Wehrle 鈥渒new very well that the [cassette test] was not a rogue,鈥� to which Schmidt agreed.

Millett then asked: 鈥淒o you accept that Arconic, through Mr Wehrle, knew that such people 鈭� architects, designers, construction professionals 鈭� were being misled by the claimed fire certification for cassette?鈥�

Schmidt replied: 鈥淵es.鈥�

The Reynobond cassettes were then tested again in 2011 and downgraded further from Euroclass E to Euroclass F after it failed so dramatically that the test had to be stopped before the end.

Wehrle said in an email: 鈥淥ops鈥�The classification of PE cassettes following the test this morning is鈥�.F!!!鈥�

Asked if this showed that Wehrle was 鈥渕aking light of this news,鈥� Schmidt replied: 鈥淭hat may be an interpretation, but I鈥檓 not certain, no.鈥�

The inquiry has already heard that Arconic had not withdrawn the product from the market because of 鈥渃ost implications鈥�.

Around 3,000sm² of the Reynobond PE cassettes were installed on Grenfell Tower as part of its refurbishment, which led to the fire in June 2017 which claimed 72 lives.

The inquiry continues.