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In the description for the salt tub caps it say “PF liner” what does the PF mean (see example below)?“43mm White Smooth Top Cap - PF Liner”

Daniel Huddleston
PF Means it has a Polyethylene Foam Liner. Its a general purpose liner material that is compressible and creates stable seal. It demonstrates excellent resistance to acids,alcohols, oils, solvents, household cosmetics and aqueous products.
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