J T wrote:
Tue, Oct 24, 2006, 6:16pm (EDT+4) (Ken Muldrew)
doth sayeth:
snip I've left them crumpled in plastic cups both inside (under
observation) and out in the sun on a hot day for up to about 6 hours.
snip
I haven't checked, but I'd suspect it might take longer than six
hours. In any event, I wouldn't want to take chances on it not
happening.
One of the local tv stations or maybe it was 60-60 or 20 minutes
ran a story on the spontaneous combustion of linseed oil
soaked rags. They put theirs insider of a corrugated cardboard
box to help it retain heat wihout cutting off oxygen and put it
in the sun. It took several hours but caught fire the same day,
IIFC.
But I think the time to ignition is going to vary wuite a lot
on conditions, the type of and concentration of driers
in the oil, the age of the oil and so on.
One person posted in here that he hung a linseed oil
soaked rag on a closeline in the sun and it caught fire
within a couple of hours. I find that hard to believe.
'Overnight' has been long enough to burn a few buildings
down.
--
FF