The supplier of the ACM cladding used on Grenfell Tower changed the composition of one of its products without informing a UK certifying body, the inquiry has heard.

Arconic added chemicals to the combustible phenolic core of its Reynobond PE panels to change the colour from translucent to black but did not formally update certifier the British Board of Agrement (BBA) about the change, Wednesday’s hearing was told.

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