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Sorry to jump in on this thread so late, but there was a problem with
the list server's delivery of my mail which has just been resolved.

I can't give an authoritative reference to why the 40% limit is used, but
in trying to answer this question once before I came across some conference
proceedings put out by the ASTM - American (?) Society for Testing and
Materials - called "Flammability and sensitivity of materials in oxygen-enriched
environments".

My observation from scanning through several of these publications is that
the people working in this field only seem to consider environments over 40%
O2.  I got the impression that this was some sort of accepted limit, where
anything less was not of interest (in terms of increased flammability).

Anyway, perhaps someone may be able to chase up someone from the ASTM
and get an expert opinion.


				Greg Ryan	gregr@cs*.su*.oz*.au*

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