What are NBI sinks made from? All NBI sinks are made from reinforced cast acrylic. For those not familiar with cast acrylic or that simply wish to view a sample firsthand, we offer material samples here. By admin|2018-01-27T22:41:32-05:00January 27th, 2018|0 Comments Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInTumblrPinterestVkEmail About the Author: admin Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment.