How come there's a TFE and Kynar long lead times

Within the last year, the business has had more difficulties than I have come across during my thirty years experience. In the past I have seen sharp price increases, and I have experienced several shortages, and delivery problems as a result of material allocations through plastic resin suppliers. This is actually the first instance I have seen all these issues at one time.

PTFE Sheet (TFE) and PVDF both are on allocation.

The two of these resins are in short supply. The  PTFE Sheet product PTFE (TFE) and PVDF  manufacturing requires a mineral called Fluorspar that's mined in Mongolia and China. The worldwide requirement for this mineral has risen significantly, and also the supply has tightened. PTFE materials have high temperature resistance, excellent chemical resistance and incredibly low co-efficient of friction (slick) and is used throughout a great deal of applications from non-stick fry kitchenware to ptfe tape for use at home. This mineral is the key raw material in the production of fluoropolymers, fluorolubricants and quite a few refrigerants.This escalating demand paired with general shortage of raw materials has caused a dramatic price increase (almost double throughout the last year), shortages, and we expect these two factors to continue in the near future.

Dupont Delrin Rod