Fig. 1.
Test material coupons
All test material coupons were treated and sterilized as described prior to use. SS: stainless steel; PS: painted steel; PVC: polyvinyl chlorid; PU: polyurethane; GS: glass; CC: cotton cloth
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.