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To: long-gone who wrote (78866)	10/25/2001 2:57:43 PM
From: E. Charters	Respond to of 116752

multimedia.mmm.com The truth is that masks like these are not that good. For one, I don't know that they protect for a fine anough dust. Those Anthrax particles are ground really really fine. You could really use a 0.50 micron filter (1/2 a thousandths of a millimeter.) For another, when you go to replace the filter, you could run into trouble. No way you should do that without another mask on! It's a stopgap. Care is always required in handling. Sorting should be done as carefully as possible. No more throwing the envelopes around. Dust leakages could be insidious. I would not personally sort mail in Washington for even a 1000 dollars a day without a rubber suit, my own air supply and being allowed to steam envelopes for ten minutes before touching them. Negative pressure sorting boxes with gloves would be the best stopgap for general protection, like the diamond mines. I would prefer to use the old 3M 8710 cotton mask, ensure a good fit and throw it away twice a day. I think it leaks a bit around the edges. Fit is important. Finally using a Racal type airstream helmet with 3 level power filtration might be the better. Putting beam irradiation equipment in postal mail streams could be done quickly by people used to installing densitometers and other milling equipment. An adequate program could be put in place fast. This is no time for in depth research. EC<:-}