Re: Ozone Masks

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve Rodway by way of Terry Fritz <twftesla-at-qwest-dot-net>" <teslalist-at-legion-elec.demon.co.uk>

Adam, Jeff,
	As part of the risk assessment for a recent job, I did test some
3M masks for ozone filtering ability. Not the exact model that
Jeff mentions, but a similar one also rated 10 x Occupation
exposure limit. By deliberately doing everything you shouldn't
with a coil, we were able to generate an ozone concentration of
2ppm which is a very hazardous level. HSE recommendations for
maximum exposure are 100ppb for 8 hours, At the 2ppm level the
mask was able to reduce that to less than 50ppb for over 2 hours.
Please don't regard these results as definite proof the masks
will protect you, but it's a good sign that they'll help a lot.

			Steve Rodway


Tesla list wrote:
 >
 > Original poster: "Jeff W. Parisse by way of Terry Fritz 
<twftesla-at-qwest-dot-net>" <jparisse-at-teslacoil-dot-com>
 >
 > Adam,
 >
 > I'm no ozone expert either, I just play one on TV.  ;-)
 >
 > You'll have to talk to 3M about the exact chemistry of the ozone
 > absorbing material. The masks are sold by 3M as ozone masks up 10x PEEL
 > (whatever that means). My stunt guys sometimes have their faces mere
 > fractions of an inch away from 10 footers. THEY say that the masks
 > create noticeably clean air. We haven't tested the masks, we're not mask
 > testers; we use them and notice they work. The people at 3M are very
 > trustworthy as a group; it's a fine company. We trust their testing
 > methods and published literature.
 >


-- 
****************************************************************
* Steve Rodway                              Legion Electronics *
* SteveR-at-legion-elec.demon.co.uk       Tel. +44 (0)1761 300615 *
* http://www.legion-elec.demon.co.uk/  Fax. +44 (0)870 0529740 *
*                                     Pager +44 (0)7661 061026 *
****************************************************************