Cladding used on Grenfell was 10 times more flammable than an alternative product that could have been used, an inquiry heard.

The supplier had known about the properties of the combustible cladding but failed to tell the borough of Kensington and Chelsea, which funded the tower’s refurbishment.

The testing had been conducted on two types of ‘Reynobond PE 55’ cladding in 2004 in France. One was bent into a ‘cassette’ form and the other was a flat ‘riveted’ panel.

There was a marked difference in the fire performance of the ‘cassette’ form, which look like large panels with ‘box’ folded sides.

When shaped in this way, the product burned 10 times faster and released seven times as much heat and three times as much smoke, the inquiry sitting on 16 February was told. The results of the test was not shared with the borough.

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