Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) Schematic illustration of the sandpaper abrasion test. (b) The effect of sandpaper abrasion length and (c) abrasion weight on the WCAs, OCAs, roll-off angles of water, and roll-off angle of hexadecane at a certain abrasion length.
