Is that why old gas masks are suspect?
Yes. If you are looking for protection, never buy a gas mask or filter from a surplus supplier. Be careful, because some masks are described as “new” even though they are literally forty or fifty years old. To some people “new” means “never been used” while to others it means “recent in origin.” A fifty-year old mask may never have been used, but it is certainly not recent in origin. By the way, our very name, Neoterik, is a word that means recent in origin.
