RectorSeal BLUE+ is a non-hardening thread sealant containing PTFE plus synthetic fibers. Allows immediate pressurization, for pressures up to 10,000 psi (liquids). Non hardening sealant. Will not dry out inside of the container. Blue + pipe thread sealant has a dobber applicator built into the lid. Lead free and conatins no metal. Use on lines carrying potable water (hot or cold), DWV, natural gas, LPG, compressed air, and most other industrial gases. Use on a variety of metal and plastic piping including iron, galvanized steel, stainless steel, brass, copper, aluminum, polyethylene, reinforced fiberglass, PVC, ABS and CPVC including FlowGuard Gold Not recommended for oxygen. FOR THE TRADESMAN: RectorSeal is recognized as a leading provider of quality solutions for the professional trades serving heating, ventilation, and air conditioning (HVAC/R), plumbing, electrical, and construction markets.