![]() Will continue to use the 7500 as my primary elastomeric respirator. Overall, I'm not terribly impressed with the HF-800. Good and more intuitive than the older style. You can now push on the sides of the strap length adjuster to loosen. Not sure if these might separate long term, especially if you decide to wash the facepiece in a dishwasher.Ĭhange in the strap length adjustment. Silicone is also overmolded onto nylon, rather than a separate silicone and nylon piece used the in the 7500. Not as comfortable as the 7500, but perhaps I need to size up instead. The new facepiece has thicker and stiffer silicone, and fits a narrower face. There is no equivalent to the 7093(C) encapsulated filter that might be better for use in rainy weather and for easy wipedown of the respirator after use.Ĭhange in the facepiece silicone. Lack of an encapsulated particulate filtration cartridge. The respirator just cannot be disassembled to the same degree that the 7500 can. Downside is that it creates complexity in the internals, and prevents you from disinfecting the respirator by soaking in disinfectant. This makes the negative seal check more effective, easier, and more hygienic, as you do not have to touch the cartridge. This is necessary for the 4-way flow design, as one does not have 4 hands to cover all the inlet surfaces of the cartridges. Pressure drop improvement is not significant for the particulate filters. Good progress on the design, but it primarily benefits those who use adsorbent bed cartridges. Nowhere near the vocal clarity that you get from a filtering facepiece respirator.Ĥ-way flow cartridges allow more surface area for flow, which reduces pressure drop. Another silicone gasket to worry about failure. Another part to inspect, sanitize, and assemble. It does increase the amount of volume in the midrange slightly, but does so at significant complexity. The biggest change is the addition of the speaking diaphragm. Some thoughts on the HF-800 in comparison to the older 7500. I've been using the 3M 7500 respirator for a while, and I wanted to evaluate the newer HF-800. ![]()
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December 2022
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