"Does exactly what it says on the tin (sorry Ronseal).
I build aquariums for a hobby and these work extremely well for when I'm cutting hardwood, sanding down glass for smooth edges, and cutting/sanding acrylic.
It even works well when using Tensol 12 (acrylic solvent), which I didn't think it would do. I know they do basic chemical filtration but I can't smell the solvent fumes so I assume it's filtering these out as well.
"The First mask (Force 8) with defrerent filter system which allowed you to breathe easy through your nose. No more nasty stuff in you body. Worth spend few more pounds on separate mask and easy replacement filters."