Nano4Fibers Nano4Fibers is a Czech company manufacturing nanofiber products. IDTechEx spoke to its CEO, Jan Buk, at TechConnect 2021. Nano4Fibers uses centrifugal spinning to make its nanofibers and produces these in polymer and ceramic forms. A recent success has been its BreaSAFE brand which manufactures reusable nanofiltered masks and respirators as well as other pandemic-related items. Nano4Fibers