The bit of asbestos that might break off will most likely get caught in the cotton layer because its tight enough that a lot of fibers won’t break off, but if it does go through that it’ll be stopped in the particle layer. ![]() The asbestos shouldn’t break off from the first layer at all, its very tightly in there, and through time and with airflow the fibers continue to get tigher, not come apart (like if you tie your shoelaces and leave them for 3 years intead of untying them every time and then you try to untie them and its super tight, just on a microscopic level) but if the fibers do come off which could happen if something too big to go between the fibers enters the filter, it could damage the asbestos. Then there’s the particle layer which is very fine and tightly packed charcoal, then there’s the gas layer which is also charcoal but not as finely ground, and then there is a small film of cotton just to hold it together. The next layer is just cotten, its to stop dust from entering. ![]() So basically the outermost layer is made of white asbestos, its to stop embers from a fire or other hot material from entering the filter. ![]() Ww2 German filters with blue asbestos were like that, Soviet filters are different.
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