It is suspected that the material, which is coated in aluminium but has a plastic, flammable core, helped fuel the devastating blaze in June.

Fire crews rushed to the factory on Kestral Way following reports of a fire in the casting plant at its foundry section.

The fire service said: "Due to the potential serious nature of this incident and knowledge of the type of building involved, fire control made the decision to redirect fire appliances from other lower priority incidents in the area to ensure fire service resources were in attendance as soon as possible."

Eight fire engines were sent to tackle the blaze, which started accidentally, along with additional support vehicles.

By 2.30am, the fire had spread to part of the roof of the factory, but firefighters using breathing apparatus brought it under control and extinguished it before 3am.