I found some so-called Class "0" cement firbre board from B&Q. It looks very much like asbestos sheet, and appears to be made of portland cement with some sort of fibre imbedded in it. B&Q's staff were unable to offer much information about thier product. One floor-walker said they sell it as an alternative to asbestos sheet, and it is pretty much fire-proof.
I would like to know just how fire-proof it is, and at what temperature it disintegrates or burns. What does "Class O" mean?
Does anyone have any info at all?
Thanks
Frank