LOCTITE 518 is a high-performance, medium-strength anaerobic gasketing product designed for sealing rigid iron, steel, and aluminum flanges. This red paste fills gaps up to 0.25 mm and creates an instant, low-pressure seal. It cures in the absence of air when confined between close-fitting metal surfaces, offering excellent resistance to oil and glycol/water mixtures. With a service temperature range of -55°C to +150°C, it ensures reliable sealing in demanding industrial applications. NSF P1 registered (No. 123001).