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

PTFE - Polytetrafluoroethylene  product PTFE (TFE) and also PVDF  manufacturing requires a mineral called Fluorspar that is mined in Mongolia and China. The world requirement for this mineral has risen significantly, as well as the supply has tightened. PTFE materials have high heat resistance, excellent chemical resistance and really low co-efficient of friction (slippery) and is utilized in tons of applications from non-stick fry pots and pans to ptfe tape for use at home. This mineral is actually a crucial raw materials within the production of fluoropolymers, fluorolubricants and lots of refrigerants.This increase in demand bundled with shortage of raw materials is mainly responsible for a dramatic price increase (almost double within the last year), shortages, and we expect these two factors to stay in affect in the near future.

PVDF