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

PTFE - Polytetrafluoroethylene  product PTFE (TFE) and also PVDF  manufacturing requires a mineral called Fluorspar which is mined in Mongolia and China. The world demand for this mineral has increased significantly, as well as the supply has tightened. PTFE materials have high temperature resistance, excellent chemical resistance and incredibly low co-efficient of friction (slick) and is utilized within dozens of purposes from non-stick fry griddles to ptfe tape for use at home. This mineral is a important raw material inside the manufacturing of fluoropolymers, fluorolubricants and quite a few refrigerants.This increased demand coupled with shortage of raw materials is mainly responsible for a dramatic price increase (almost double throughout the last year), shortages, and we expect both these factors to keep at it in the near future.

Foraflon