Polytetraflouroethylene (TFE) and Kynar both are in short supply.

Teflon  product PTFE (TFE) and also Kynar-PVDF  manufacturing requires a mineral called Fluorspar that is mined in Mongolia and China. The worldwide requirement for this mineral has increased significantly, along with the supply has tightened. PTFE materials have high heat resistance, excellent chemical resistance and extremely low co-efficient of friction (slick) and is used in a great deal of purposes from non-stick fry cookware to ptfe tape for home use. This particular mineral is actually the critical raw material inside the manufacturing of fluoropolymers, fluorolubricants and lots of refrigerants.This increase in demand bundled with general shortage of raw materials is responsible for a dramatic price increase (almost double during the last year), shortages, and we expect both these factors to stay in affect in the near future.