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Its not like its deliberately more flammable. its just not inflammable, for some applications this would be fine. Outbuildings, standalone walls etc. It's not really down to the manufacturer to decide what's used on a project, they just make the stuff.
You don't get Smith and Wesson getting blamed when someone is shot
PhilDAS-
One grade, the 'PE', is offered where flammability is not a deciding factor in the application, as 'PE' has inherent flame soreading/propogation properties.
The manufacturer knows the 'PE' grade is an inherent, avoidable hazard where flammability is a deciding factor, so also offers an 'FR' grade with some flame retardancy. Seems to me a clear case of 'Duty of Care', and the saving of <£5k has cost >100 lives.
mespilus
Manufacturer offers two grades, one labelled 'FR', and sells the one that is more flammable?