Intertek warnock herseyIntertek warnock herseyfrom Business Wire. Product Directories | Warnock Hersey Mark Click here to view our products that bear the . . About Us. Warnock Hersey www. . FM Approvals; Underwriters Laboratories Inc. Flame Seal receives Warnock-Hersey and Intertek Laboratories . V. . . . Products must bear labels in order to demonstrate Intertek/Warnock Hersey Certification. . worldlab. . This information listed in the directories is subject to the Certification agreement bet... more