on May 25, 2008
I use these filters on a 3M 7502 half-face respirator and they are great. I build smokers which require gas-flux (MIG) welding, stick-welding (SGMAW), oxy-acetylene cutting, and a lot of abrasive use (cutting wheels and grinding). Before I started using the respirator and these filters I would expectorate blackened material from the junk I was inhaling but with these and the respirator I can work a full day and not have any discolored discharge; it's great and I'm pretty sure it's going to help me live longer and healthier. I also then paint these smokers with a high-temp paint that I cut with mineral spirits. I made the mistake of painting one once without the respirator and the fumes gave me the worst migraine I've had in years, but when I use these and the respirator I can't even smell the paint/mineral spirits, and I don't get a migraine. I love these things and the whole setup is *cheap*.
on February 12, 2009
I've tried many different kinds of dust masks but never one as good or as inexpensive as the one this filter attaches too. I've always fought inhaling dust with palm and belt sanders doing flat woodwork but no longer. I've recently taken up wood turning and noticed with other masks you end up with LOTS of dust in your lungs and nose, even turning wet wood. Using this half mask filter, you can't even smell what type of wood you're turning - there just is no smell getting through. This filter and mask set costs less than many "high grade" dust masks that don't even begin to stop as much as this set does. BEST EVER - BUY A SET NOW. I've just rough turned about 40 bowls over three days of turning and the filter set is still working great - there's been no noticable breathing retriction.
on June 16, 2012
****Update - 7-22-2012**** - please read the comments section for a link to a PDF that aids in selection. Right now I don't have time to read it to adequately update this review.
1. I am lowering the start one rating due to the difficulty in understanding which filter covers which substance/need. I know looking across the product line and reviews on Amazon that people are using certain filters in situations that don't match the filter. (what does "organic vapor relief" really mean anyway?)
3M needs to put out a mass matrix (or a look-up web site) that lists many different uses/chemicals/substances and then the appropriate filter. I have seen a matrix or two, but they are too simple. No need to over kill on a more expensive filter or more importantly end up getting the wrong one. It doesn't appear there is one filter that covers everything. If you think it is this filter, read my warning below as one example.
Which filters should I used for an insecticide or pesticide?
2. It would also be nice if there is some way you could tell when a filter needs to be replaced. (like a color change).
3. As other have noted this item is two filter (2 pack) work together. You are getting one filter set.
4. It would be nice to have a way to buy multiple sets and save some money. I know there is a 50 pack out there some where to buy but a 5 or 10 pack would be good.
A word of warning for ozone use....
Adding a note, based on reading, you need to use an Oxygen tank system for use in a High Ozone environment. see Self Contained Breathing Apparatus, or SCBA.
I recently purchased an ozone generator (shock treatment/blast) for cleaning/odor removal.
This filter is often referenced as being suitable for use to work while (by some of the makers for the ozone generators). looking at 3m documentation, this filter isn't rated for high levels of ozone. It is approved for 10x OSHA specs for normal. A ozone shock treatment does a lot more then 10 times (according to 3M this is for "concentrations up to 10 times the Permissible Exposure Limit (PEL))".
I found this out the hard way. I was using the mask to work in other areas of a building and started getting discomfort. I decided to stop the ozone treatments and do something else but had repository issues for the next day.
Just a guess, this filter is really only good for 2-4 hours in a high ozone environment. Disclaimer: I have no information to back this up other than when I first had it on, I had no issue for a couple hours and the air was clean. I was using a 14,000 MG ozone generator in less than 1,500 square feet. If you are using a larger generator you may not get much protection. I think I hit about hour 6 hours (filter use over multiple sessions, when I started noticing problems. By then it was too late. According the manual these filters are suppose to be good for 40 hours. Most of my use was not in the actual room where the generator was, but it other rooms usually protected by a door (of course ozone leaks out really easy).
So I will only use this filter for ozone generator setup/starting. So much for my idea of wearing this mask and still working in a building to save time. As I said this filter was mentioned by some of the generator manufactures for use. If someone knows of another inexpensive option for ozone filtering, let me know. See note above about "self contained breathing apparatus" (SCBA).
I am sure this same issue would apply if someone is painting and the there are too many fumes that the filter becomes overwhelmed too soon.
Here is the wording from the instructions on limitations:
Time Use Limitations
1. If filters become damaged, soiled, or breathing becomes difficult, leave the contaminated area
immediately and replace the filters.
2. If used in environments containing only oil aerosols, dispose of filters after 40 hours of use or 30
days, whichever is first.
3. If used for ozone protection (3M 2097 and 2297 P100 Particulate and nuisance level organic
vapor), replace filters in accordance with an established change schedule, or earlier if smell, taste
or irritation from contaminants is detected.
on October 13, 2015
The 'organic' function built into these things REALLY does work. If you're a janitor or have the misfortune of having to clean or maintain primitive restrooms, (managed by local, state or federal government units), these and a re-usable respirator are the least you can do for yourself. Either that, or you can take your chances with an endless assortment of respiratory & biological disasters (histoplasmosis, blastomicosis, hepatitis, etc). Don't expect your boss or bureaucrats to know the risks & threats. Protect yourself.