[Geoff]

If it is...I would not discard it.
It is perfectly safe if not disturbed much, polverized etc.
It takes working with it constantly, inhaling dust to develop problems.

That's what I always figured. Long-term occupational exposure is what causes the health issues. I already removed it and sealed it in a plastic bag. I'll replace it with what was recommended on the Canadian site or something similar:

In cases of the ACM being used as a heat-protecting sheet, glass fibre has similar insulating properties and you can buy small glass-fibre mats designed for plumbers, to prevent heat from blowlamps scorching paintwork etc. These are readily obtainable at low cost from most DIY stores, and are easily to cut to size.

Thanks guys!

- Geoff