Have not seen it in person, But:::
http://www.tuffwrap.com/smartseam/
http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?name=BLME.R27543&ccnshorttitle=Ceiling+Panels+for+Use+Beneath+Sprinklers&objid=1083180394&cfgid=1073741824&version=versionless&parent_id=1073984637&sequence=1
http://www.tuffwrap.com/smartseam/
http://database.ul.com/cgi-bin/XYV/template/LISEXT/1FRAME/showpage.html?name=BLME.R27543&ccnshorttitle=Ceiling+Panels+for+Use+Beneath+Sprinklers&objid=1083180394&cfgid=1073741824&version=versionless&parent_id=1073984637&sequence=1