HEPA air filters are routinely made from fiberglass. It’s not debated. HEPA is a common material of vacuum cleaner bags because they are trying to keep the particles locked in so they don’t cause allergy and make the vacuum cleaner more efficient, so I would say it’s not really something I want to debate on. Just avoid. Just don’t take chances like that.
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Starla McCullar I’d rather home sewers just don’t try to guess right and then hand out dozens or hundreds of masks and feel good about themselves but they’re all fiberglass. The article another commenter cited gives me no comfort. A manufacturer is less than forthcoming on the materials they do use but warns against using it for masks, and another person with a vested interest in selling more vacuum cleaner bags says they’re all safe, go wild! No list. Everyone on their own just check with the manufacturer of your vacuum bags – you know people just skim and read headlines to find what they want to hear. That’s reckless.