Aluminium composite panels (ACPs), as used at Grenfell, containing a polyethylene core can be highly flammable. High-pressure laminate (HPL) cladding, which is also widely used on high-rise buildings, is at least as flammable.

What cladding is a fire risk?

In fire safety terms, cladding can be dangerous in a few ways. ... If the cladding system in question contains combustible materials, such as expanded polystyrene (EPS) or polyurethane (PUR), then exposing these materials to a flame will result in fire spread on the outside of a building.

What is flammable cladding made of?

MCP products are sandwich-type panels, usually between 2-5mm thick, that consist of two metal outer layers and a core material. MCP includes products with outer layers of copper and zinc but the most common are products that use aluminium as the outer layer. These are referred to as aluminium composite panels (ACP).