![]() ![]() These pores act kind of like a sponge, attracting and trapping certain gases and particles as air flows through the filter. Activated carbon is a form of charcoal that has been treated with oxygen to create millions of tiny pores between the carbon atoms. The most common type of gas mask filter is the activated carbon filter, which is made up of a layer of activated carbon material. Match your filter to the anticipated threat, or exceed it. These filters are designed to protect the wearer from breathing in hazardous gases and particles, such as chemicals, smoke, and biological agents. This isn't just burning chemicals and fumes- particulates are cause for concern as well, not to mention chemical irritants and otherwise Particulate filters are generally smaller and easier to obtain How Filters Work Gas mask filters work by using various materials and technologies to remove harmful contaminants from the air before you breathe them in. It's important to know what you're buying- a week ago most people probably didn't consider CBRN threats a valid worry, but as current events are showing, it can happen anywhere. Not all filters are created equally- something that will help you with sawdust particulates but isn't rated for chemical fumes won't be the same as a filter that'll help against biological agents. Theoretical breakthrough times source: Scott Safety.GAS MASK FILTERS The Basics and Considerations Before we get into classification, it's important to talk about how filters work. Special filters breakthrough times (AX et Hg-P3): Filter type Test preamble: Test gas concentrations for PAPR masks are set at 500 ppm (0,05% volume) for class 1 and 1.000 ppm (0,1% volume) for class 2. Gas filters for powered air purifying respirators: Test preamble: test gas concentrations for gas masks (negative pressure) are set at 1.000 ppm (0,1% volume) for class 1 and 5.000 ppm (0,5% volume) for class 2. Gas mask filter breakthrough time: Gas filters for negative pressure respirators: Information is available on technical sheets. * the filter capacity depends of the manufacturer. Shelf life = (1 000 000 x filter capacity*) / (breathing rate x gas concentration) ![]() There is a formula to calculate a gas filter shelf life: As they pack granules shocks will reduce their absorption power Shocks: shocks on a respirator cartridge have harmful effects.The opposite effect also occurs for some gases like ammonia (nh3) or hydrogen sulfide (h2s) Relative humidity: for vocs, high humidity will accelerate the breakthrough time. ![]()
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