Loctite 5400 is designed for the locking and sealing of metal pipes and fittings as well as other cylindrical metal assemblies. It ensures an instant, low-pressure seal for metal pipes and fittings at low temperatures. Will not creep, shrink or block systems by shredding. Its key differentiator is the White Material Safety Data Sheet. Loctite 2400 carries no hazard symbols, risk or safety phrases and does not contain any declarable carcinogens, mutagens or reproductive toxins.