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The sales executive who sold combustible cladding to the Grenfell Tower refurbishment knew that it was unsafe to use on high rise buildings, the inquiry has heard.

Former Arconic sales manager Deborah French sent an internal email in 2013 warning of the dangers of using aluminium composite cladding (ACM) following a series of high-rise fires in the Middle East.

French sent a link to a May 2013 BBC news article to colleagues about the string of blazes in the United Arab Emirates of buildings which had been clad in ACM.

The article described how fires in these buildings had 鈥淸spread] rapidly, racing to the top of the building and sending flaming debris hurtling to the streets below鈥�.

French also forwarded an email from a salesperson at rival company Alucobond who wrote that ACM cladding could behave like a 鈥渃himney which transports the fire from bottom to top or vice versa within the shortest time鈥�.

鈥淭he perils of using cheap ACM alternatives have been exposed,鈥� the email added.

At the time of the email, French was negotiating with the project team for the Grenfell Tower refurbishment for the sale of 3,000m² of Arconic鈥檚 combustible Reynobond PE cladding, a type of ACM. 

Despite being aware of the dangers of ACM, French told the inquiry in her witness statement that, during negotiations with the Grenfell refurbishment project, 鈥淚 do not recall ever thinking about the height of the building or the extent of the cladding鈥�.

She said that this was because 鈥渁s far as I was concerned at the time,鈥� the product had a certificate from the British Board of Agrement stating that it 鈥渕ay be regarded鈥� as meeting UK Class 0, meaning that it was safe for use on buildings over 18m.

Arconic had at the time been using a 2008 test report of Reynobond PE to claim that the it met the Euroclass B standard, which was used by the British Board of Agrement (BBA) as the basis for giving the product the Class 0 rating.

But in February 2014, then-technical manager Claude Wehrle sent French a test report of Reynobond PE which showed that it only achieved the Euroclass E rating.

Wehrle wrote: 鈥淭he previous 鈥楤鈥� class reported done for Reynobond PE in riveted system can no more be used from now.鈥�

Despite Wehrle鈥檚 email, the inquiry heard that French did not inform customers about the changed rating, instead sending the original BBA certificate to buyers, including the Grenfell Tower team.

French said in her witness statement that she did not recall ever being specifically asked to send or highlight the new report to customers.

Counsel to the inquiry Richard Millett QC asked: 鈥淲as it not reasonably clear to you at the time when you received this information from Mr Wehrle that it was being sent to you for you to do something with?鈥� 

French replied: 鈥淎t the time, no. I didn鈥檛 think it was relevant to the UK.鈥� 

Millett asked: 鈥滵id you simply take it on yourself to ignore it without seeking any advice or instruction or guidance or help from those senior to you at Arconic?鈥�

French replied: 鈥淵eah, I don鈥檛 recall what I - what action I took at the time.鈥�

Millet then asked: 鈥淲ell, on the look of it, you just sat on it; is that right?鈥� to which French replied: 鈥漎eah, I don鈥檛 recall what action I did or didn鈥檛 take with it.鈥�

Millet asked French if, given that by this time French was aware of the dangers of using ACM on high rise buildings, and that Reynobond PE was no longer Class B but Class E, that 鈥淪urely, putting those two facts together, this would have indicated to you that not all was well with continuing to use Reynobond PE鈥� on high rise buildings?鈥�

French replied: 鈥淚 honestly can鈥檛 recall having made those - pulling that information together in the way that you鈥檙e explaining it.鈥�

Reynobond PE was the most popular of Arconic鈥檚 cladding products in the UK at the time, with the inquiry hearing yesterday that it was sold 鈥渂y default鈥� over a slightly more costly fire retardant version known as Reynobond FR.

French told Tuesday鈥檚 hearing how she 鈥渃annot remember a single occasion on which I sold FR鈥� in the UK, despite the fire retardant product being 鈥渕uch more鈥� popular in Germany.

Phase one of the inquiry into the 2017 disaster that killed 72 people in 2017 found that the cladding installed on Grenfell Tower was the 鈥減rimary cause鈥� of the spread of the fire.

The inquiry continues.