Results of durability test and lubricant retention tests of ELIS coating. (a) The bending illustration of carnauba wax-coated SHS and CO-infused ELIS (the coated pet film was bent 180°). (b) Bending durability of SHP and ELIS. (c) Water jetting durability of SHP and ELIS. (d) Lubricant retention ability tests for 30 days.