Grenfell Tower cladding firm ‘warned blaze could kill 60 to 70’ a decade before deadly fire Samuel Osborne Replay Video UP NEXT The firm that made the cladding used on Grenfell Tower was warned the risks of a fire could kill “60 to 70” people a decade before the fatal blaze. Arconic marketing manager Gerard Sonntag asked colleagues what the costs would be of only selling aluminium composite material (ACM) with a fire-resistant core, rather than the polyethylene (PE) plastic alternative, after hearing about the potential dangers in a presentation in Norway in 2007. The company, formerly known as Alcoa, provided the ACM PE-cored panels which were installed during its refurbishment and helped fuel the blaze in 2017.