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

PTFE - Polytetrafluoroethylene  product PTFE (TFE) as well as Kynar-PVDF  manufacturing requires a mineral called Fluorspar which is mined in Mongolia and China. The world requirement for this mineral has grown significantly, and also the supply has tightened. PTFE materials have high heat resistance, excellent chemical resistance and incredibly low co-efficient of friction (slick) and is used in a good deal of applications from non-stick fry pots and pans to ptfe tape for personal use. This mineral is actually a important raw materials in the manufacturing of fluoropolymers, fluorolubricants and many refrigerants.This rise in demand linked with 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 stay in affect in the near future.

Foraflon