PTFE (Polytetrafluoroethylene) kaseti ya firime nibikoresho byihariye byo gufunga bikoreshwa cyane mubikorwa bitandukanye byinganda kubera imitungo idasanzwe. PTFE ni fluoropolymer ikora cyane izwiho kurwanya imiti myiza, gutongana bike, n'ubushyuhe bwo hejuru. Ibi biranga PTFE ishishikajwe kaseti ihitamo ryiza ryo gufunga porogaramu muburyo butandukanye