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with oxygen opens up millions of tiny pores in the pieces of charcoal. These pores play the important role of filtering out chemicals. Activated charcoal is used because it's good at attracting organic (carbon-based) impurities. So when they pass next to the surface of the charcoal, they bond to it and become trapped in the pores in the charcoal. Once all the porous binding sites are filled, the charcoal filter stops working. That's when it needs to be replaced. But there are many chemicals that aren't attracted to the charcoal — so they pass right on through. That's why you want to make sure you choose the right cartridge for the job. CHOOSING A CARTRIDGE When choosing a cartridge, it's always important to read the label on the finish you'll be using. That way you'll know which gases, vapors, or chemicals the respirator cartridge needs to filter out. The cartridge used for most finishing tasks should be rated for organic vapors and gases, lacquers, paints, and enamels. You'll find these black cartridges at most paint stores and home improvement centers (see color code chart at right). Be Aware. These cartridges may not provide adequate protection from things like ammonia that's commonly used in wood fuming. Also, some furniture strippers and finishes contain methyl chloride, which may not be filtered out by this respirator cartridge. You should also be cautious when using urethane finishes. These compounds are odorless. So they may not be detected if the filter becomes saturated or the respirator leaks. If you're going to be using one of these finishes, your safest bet is to contact the manufacturers directly. They'll be able to recommend the specific cartridge you'll need for the finish or solvent you're working with. But even if you have the right cartridge, you still won't be protected unless the respirator fits on your face correctly. ▲ Filter Cartridge. Air enters through a pre-filter where large pigment and dust particles are taken out. It then passes through carbon filters and activated charcoal to remove the chemicals before entering the mask. THE RIGHT FIT The first thing you'll need to do is adjust the straps so that the face piece fits snugly on your face (an almost impossible task if you have facial hair). Be sure it doesn't leak around the face piece and that you can breathe in and out easily. You shouldn't smell finishing odors while wearing the respirator. If you do, first try readjusting the mask. If the odor persists, you may need to replace the cartridge. And if that doesn't solve the problem, consider replacing the respirator. Proper Care. A respirator should last you a long time. But you must maintain it and store it properly to ensure that it always works right. it only takes a little bit of time to keep your respirator in good shape. First, remove the cartridges and give the mask a good washing with mild soap after each use. If s important to rinse the mask thoroughly so that any detergent residue is removed. That way it won't harm the mask or irritate your skin the next time you use it. Finally, dry it off completely. Then store it in a plastic bag away from temperature extremes, moisture, and vapors (remember how it works). That way it's ready to go the next time you need to use it. A Cartridge Color CodingAll manufacturers use the same color coding for cartridge protection. You should change the cartridge any time you taste or smell a substance, or if your throat or respiratory system becomes irritated. Organic Vapors BLACK Organic Vapors/Acid Gas YELLOW Acid Gas Ammonia Gas WHITE Particulate HEPA(P10Q) Not for gas and/or vapors 43 CARTRIDGE CROSS SECTION Outer cover holds pre-filter in place filtered air into mask Charcoal filters Filter cartridge assembly Pre-filter removes larger pigment and dust particles Activated charcoal |
