I have the 3M 8271 P95 Respirator with Valve which I got from Toolup.com. They work good, they have a rubber seal around the edges which blocks everything out. They are a bit pricey, $31.23 for a box of ten. I figure it's worth it, you can't buy a new set of lungs for that much. I find with the cheap kind, about half the dust goes right around it.
I'm not sure about the kind that you mentioned. The pictures never show if they have that rubber seal around the edges or not, which I think is the important part.
"Chief among these is a NIOSH approval rating (such as N95). These ratings start with a letter, N, R or P. The "N" indicates a mask that is non-oil resistant. That is, the electrostatic properties of the filter media will be compromised by the presence of oil mist. The "R" indicates a mask with oil-resistant filters. If oil aerosols are present, the mask should be discarded after 8 hours of use. The "P" indicates an oil-proof filter. If used in an environment containing only oil aerosols, dispose of mask after 40 hours of use, or 30 days, whichever comes first."
I wear a North 7700 1/2 face respirator. Easy to clean, has removable cartidges. Cost a little more than than mask, well ok so it cost a lot more but so much more efficient. But once you buy the mask all you really have to replace are the cartidges and they are not that bad. Plus I use the same mask with OV cartidges when painting. PS I hate insulation so I have a North 7700 Full Face respirator. Cartidges are interchangable with the 1/2 face. Not cheap but it sure is nice to not have the itchy-red eyes.
In all seriousness, I have been very lax about using dust masks. Over the past year, I have noticed that it bothers me more and more, and have now put dust collection and filtration as a high priority when working. I try to catch as much as possible at the source, with a dust collector and Festool CT22 vac. HEPA on both. I also installed HEPA's on my Shop-Vac and Fein. Now I have just installed a Powermatic PM1200 air filter for the shop as well. It has helped a lot. Still not as dilligent as I should be on the dust masks, but I'm a lot better. I especially hate wearing them when it's hot. I live in Mississippi, where that can be an issue. Still looking for some I really like, but I'm guessing that's probably not going to happen. I was considering one of the powered respirators, but that just looks too:jester:
OSHA does not require a mask unless it is determined one is needed, then it must be OSHA approved. Using a non approved mask suggests that it was determined one was needed in which case you are violating regulations.
Also, FWIW if it is a respirator (read 2 bands on head) then you are required to be tesed for lung capacity (forget what that is called now) and fit tested for the respirator if you fall under OSHA regs.
Not sure if the N95 dust masks would get an exception, but I know some safety guys would rather you breathe crappy air than get some filtration without certification
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