I purchased these for my respirator, and I can't thank 3M enough for creating them. I use them for painting (shellac, lacquer, urethane, etc), and stripping of furniture. Although we work in a well ventilated area, there isn't even a hint of chemical smell of any kind when breathing through these, no matter how close to the project I have had to get to see something.

Note: If using sporadically, it is best to put them on, use them for a project, then take them off as soon as you're done and put them in an air tight bag until next use. I heard this will keep them from reacting with the open air, which would cause them to be used up after only a few days.

My friends use these exact cartridges as well, and we all enjoy the product, as well as their pink air filters for sanding dust, drywall dust, working with insulation, etc.