Robustness of the freestanding PBF 5 wt%. (IMAGE) National Research Council of Science & Technology Caption Robustness of the freestanding PBF 5 wt%. It is flexible, bendable, foldable, twistable. Credit Korea Institute of Science and Technology(KIST) Usage Restrictions The sources of photos and research results from KIST must be specified. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.