Honeywell North 5500 Series half mask with (2) N75003 OVAG cartridges. Size large. (5503L)

This works perfectly and saves my lungs at work. I work around phosphoric acid. Without this mask I wouldn't be able to breathe at work or afterwards. My employer doesn't provide safety equipment and this is the exact mask recommended by the manufacturer of the chemicals I use.Thank you, Amazon for selling this setup and saving my lungs! It's also the best price on the web and free delivery for Prime members.

I bought this mask to use when I was prepping my basement floor for epoxy coating. I used muriatic acid and the mask was great. I could not smell or breath in, any of the acid fumes. The only question I have is when to replace the cartridges. The instruction did not give you a clear answer. It worked fine for my whole project, but if I need the mask in the future I'm not sure if the cartridges are still good.

This mask is advertised as including 2 organic vapor/acid gas cartridges; however, what you will actually receive is a plain plastic bag with a mask and a pack of filters inside (no manufacturer packaging. While disappointing, this is not the real problem. The cartridges that are actually included are for organic vapor only... NOT ACID GAS!!! I contacted Amazon regarding this and they refunded my order. They also promised that they would pull the listing off of their system when I explained to them that one whiff of some acid gases can actually kill you. I see that they still haven't taken down the listing though, so BUYER BEWARE!!!

I used this for protection when I used HC Infusion Acid Stain on a concrete floor in an enclosed space. I couldn't smell the muriatic acid at all. I also used it when I applied the sealer, which had strong fumes that smelled like varnish. Again, no scent at all with the mask on. I wouldn;t want to wear it all day but for an hour or two it is great.

After a few months of use a sticky residue has formed on the mask, had the same problem with another top line brand. Going to stick with the 6503 from Minnesota Mining and Manufacturing.

Exelent performance against HCl vapors