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) Maximum surface potential measured for a high number of repeated applications of virgin and used PA12 powders. (b) Relaxation of the electrostatic surface potential over time. Voltmeter probe has not been moved relatively to the powder layer in this measurement. Experiment has been conducted at 30% relative humidity.
