PTFE (TFE) and PVDF both are experiencing long lead times.

PTFE - Polytetrafluoroethylene  product PTFE (TFE) along with Kynar  manufacturing requires a mineral called Fluorspar that is mined in Mongolia and China. The world need for this mineral has increased significantly, as well as supply has tightened. PTFE materials have high heat resistance, excellent chemical resistance and very low co-efficient of friction (slippery) and is utilised within a good deal of applications from non-stick fry cookware to ptfe tape for home use. This mineral is actually a key raw materials inside the manufacturing of fluoropolymers, fluorolubricants and several refrigerants.This rise in demand paired with general shortage of raw materials is mainly responsible for a dramatic price increase (almost double throughout the last year), shortages, and we expect these two factors to continue in the near future.

Foraflon