When I was young we lived on a farm at Mirboo North in Gippsland and my father used pentoxide constantly, mostly in an old exarmy knapsack that didn't seal to well on the lid and he would come home with the back of his shirt soaking in the stuff.Mum used to be concerned about it. After selling the farm in the mid sixties we moved to Melbourne and he worked in the building industry and a lot of the work he did involved working with asbestos materials on boilers and pipework. Eventually he did die but at 96 the odds were always stacked against him