https://wccftech.com/noctua-unveils-updated-a-series-sterrox-fans-updated-coolers-and-more-at-computex-2018/

Noctua had some big changes in its line up with the inclusion of their Sterrox fans which we’ve been excited about for the past few months. They also are updating some of their old heatsink designs to be more efficient.

First off they are showing off prototypes of their next generation fans. The new NF-A-Series is the first fan made of Noctua’s novel Sterrox LCP material and integrates the company’s latest innovations in aerodynamic engineering in order to achieve an unprecedented level of quiet cooling performance. Why Sterrox is such a big deal is mostly because the distance between the blade tips and the inside of the frame. This distance is only 0.5mm. This is highly ambitious and if done properly (Which if Noctua is going to market with it it should) helps the NF-A12x25 to work more efficiently against back pressure, such as on heatsinks or radiators, by reducing leak flows through the gap between impeller and frame. Manufacturing a fan with such a small tip clearance is extremely delicate and was only made possible by Noctua’s new Sterrox liquid-crystal polymer (LCP) material, which features extreme tensile strength, an exceptionally low thermal expansion coefficient and excellent dimensional stability. We now have more information on the product lineup and it comes in varieties of 140mm-80mm-70mm-60mm and finally 50mm