From: gtosiris{at}mpx.com.au
To: "ATM shore" 
Reply-To: gtosiris{at}mpx.com.au


On 30 Dec 2002, at 13:17, Vladimir Galogaza wrote:

>  >If you create a cloud of dust , wear the mask, otherwise forget it
>
> The mask will be useful or not, depending on its type, filters
> condition and other factors which are not easily controllable.
>
> Creating dust and wearing mask does not help others in the vicinity
> wearing no mask. Dust can settle down and became airborne later when
> children will be around or other unprotected persons.
>
> Creating cloud of glass dust is  asocial kind of behavior.

Hi. A simple polypropylene half-face
"disposable/maintenance-free" particulate respirator with two
elastic straps should be sufficient. For particulates the existence of
facial stubble or a beard should not be a problem. Simply do not position
the respirator too high on the nose and shape any metal nose tab once the
respirator is fitted. One strap positioned high on the head and the other
strap positioned low will help ensure a suitable face seal. Facial sweating
will also help create a suitable seal. If the inside of the respirator is
kept clean it can be used until the breathing resistance (from increasing
numbers of trapped particles) becomes uncomfortable. (Gas/vapour
respirators/filters are unsuitable for protecting against particulates. And
facial stubble or a beard prevents a suitable face seal being obtained for
such.) Regards, Gary Thompson

--- BBBS/NT v4.00 MP