In a nutshell
The right choise for
With Loctite 549, you create dependable, leakproof seals on rigid metal flanges and mating faces. This orange, single-component anaerobic flange sealant bridges gaps up to 0.25 mm on transmission housings, pumps, thermostats, and compressors, reliably replacing traditional pre-cut gaskets. Thanks to its thixotropic consistency, the paste stays exactly where applied without running or dripping. It provides an immediate low-pressure seal straight after assembly before curing at room temperature in the absence of air. With a wide operating temperature range from -55 °C to 150 °C, it withstands vibration and thermal stress while allowing clean disassembly during maintenance.