For moisture resistance, paper cups are coated with plastic (typically polyethylene or polylactic acid) or wax (typically parafin). Sources: - https://papercu

For moisture resistance, paper cups are coated with plastic (typically polyethylene or polylactic acid) or wax (typically parafin). Sources: - https://papercupcompany.net https://papercupcompany.net - https://bioplasticsnews.com/polylactic-acid-or-polylactide-pla https://bioplasticsnews.com/polylactic-acid-or-polylactide-p... - http://tylertalkstrash.com/2013/06/02/can-you-compost-paper-cups-reposted-from-crazyaboutcompost-com http://tylertalkstrash.com/2013/06/02/can-you-compost-paper-...