CAFEC
A pure paper-goods maker - abaca and wood pulp only, no plastic anywhere in the product. The abaca blend is a quality play (strength and flow rate for pour-over), not a marketing angle, but it happens to keep the filter plastic-free by construction.
How clear are their specs?
States the abaca/wood-pulp blend and FSC sourcing plainly, but doesn't publish an exact fiber ratio or independent lab testing (e.g. no PFAS data has been published by CAFEC or found from a third party).