For high vibration environments such as refrigeration and industrial applications. Designed for sealing vibration prone NPT (National Pipe Thread) connections. Excellent as a gasket adhesive on flanges. Lead free. For use with potable water. Contains PTFE (polytetrafluoroethylene). Brushable from 20 F to 140 F. Recommended for galvanized steel, iron, brass, copper, aluminum, stainless steel, PVC (polyvinyl chloride), polyethylene, reinforced fiberglass. Certified to NSF/ANSI/CAN 61.