Well nobody is certain, but people have taken them apart and didn't find anything. So I don't believe they have asbestos, but they may be toxic in some other way.
DON'T USE the big coffee-can style masks because they do contain asbestos. But the standard mask should be fine. If you still don't want to use them, you can buy the Swiss 40mm thread gas mask filters.
No they don't, Gas Mask filters are designed not to go bad despite if the lid is unscrewed off, unscrewing the lid of a gas mask filter doesn't have any effect on the gas mask or it's filters.
the C2 Series canister The primary filters
primary filters or... The C2 Series Canister
Maska
diphosgene
It filters out unwanted chemicals. It's also used to filter water like the Brita filters.
They use the military varient of the Gp7 gas mask.
Well the evidence I've seen so far seem to indicate that they do not. Several people have posted clips on youtube where they have cut open said filters and found only activated charcoal and several flammable cotton and paper based filter elements. Most asbestos use in gas mask filters seems to have stopped in the late 50's. The GP5 gas masks that were imported into the United States come from the Ukraine and are of late 80's manufacture or newer. Really there is no need to take the risk, since the filters are too old to likely be of use anyway. It would be wiser to purchase a new manufacture filter with standard NATO 40mm threads which are compatible with the Gp5 mask.
It removes harmful chemicals from the air you are breathing.
Make sure the filters are securely attached
It had filters to prevent poisonous particles for being breathed in.
The Primary Filters