Loctite 573 – Flange sealant

Loctite 573 is a high-performance anaerobic flange sealant designed for sealing rigid metal flanges and close-fitting machined joints. It cures in the absence of air between metal surfaces to form a durable, flexible seal that prevents leakage of oils, fuels, coolants, water, and many industrial fluids. Its slower curing speed makes it particularly suitable for large flange assemblies where additional time is needed for positioning and alignment.

Loctite 573 fills gaps and surface imperfections between metal flanges, eliminating the need for conventional cut gaskets. After curing, it provides excellent resistance to vibration, pressure, thermal cycling, and corrosion, ensuring reliable long-term sealing performance. The sealant remains flexible, allowing it to accommodate slight movement and thermal expansion without cracking or shrinking.

It is commonly used on aluminum, cast iron, and steel flanges in industrial machinery, automotive components, pumps, compressors, gearboxes, and hydraulic systems. The product helps simplify assembly, reduce maintenance, and improve equipment reliability.

Key Features

• Anaerobic flange sealant for rigid metal flanges
• Slower cure allows easy positioning of large assemblies
• Forms a durable, leak-proof seal
• Excellent resistance to oils, fuels, coolants, water, and industrial chemicals
• Fills gaps and surface imperfections
• Eliminates the need for traditional pre-cut gaskets
• Resists vibration, pressure, and thermal cycling
• Protects against corrosion and fluid leakage

Typical Applications

• Gearboxes and transmission housings
• Engine and pump flanges
• Compressor housings
• Hydraulic and pneumatic equipment
• Industrial machinery and process equipment
• Metal-to-metal flange sealing

Benefits

• Prevents leaks and improves equipment reliability
• Reduces maintenance and downtime
• Simplifies assembly and gasket inventory
• Provides long-lasting sealing performance in demanding industrial environments

Loctite 573 is an ideal flange sealing solution for applications requiring extended assembly time, dependable leak prevention, and durable sealing of rigid metal flange connections.