An Arconic technical manager described the firm as “not clean” to a sales executive who had been trying to sell the same type of combustible cladding panels used on the Grenfell Tower’s refurbishment, the inquiry into the west London fire has heard.

Thursday’s 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’s 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.

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