Chemours in the Semicon Manufacturing Industry
The spherulites in Teflon™ PFA HP are around 15 microns in size. For comparison, in Teflon™ PFA HP Plus they are very small and uniform, in a narrow mean below 2 microns in size.
These images (below) show another comparison of the spherulite size in the two families of polymers. The samples are from the cross-section of extruded pipe, at the inner wall. They have been cut into a very thin section. The uniform, fine grain structure of PFA HP Plus can be readily seen.