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LOCTITE 549 Flange Sealant for Pumps Compressors and Transmission Housings
LOCTITE 549 Flange Sealant for Reliable Metal Flange Sealing
LOCTITE 549 Flange Sealant is a ready-to-use, one-component anaerobic gasketing product designed to seal close-fitting rigid metal faces and flanges. The orange, gel-like material cures at room temperature when confined between assembled metal surfaces and isolated from air. It creates a formed-in-place gasket that fills minor surface imperfections, helps prevent fluid leakage, and reduces dependence on pre-cut gaskets. Its thixotropic consistency keeps the product in position during application, making it practical for vertical, horizontal, and irregular flange geometries.
Developed for industrial manufacturing and maintenance, LOCTITE 549 Flange Sealant is especially suitable for pumps, thermostats, compressors, transmission housings, axle covers, gear housings, and other rigid metal assemblies. The single-component format eliminates resin and hardener mixing, while the slower curing profile provides useful time for positioning larger components and tightening multiple fasteners. Immediately after assembly, the product can provide a temporary seal against low pressure while the anaerobic cure continues inside the joint.
Key Benefits of LOCTITE 549 Flange Sealant
LOCTITE 549 Flange Sealant combines medium strength with controlled viscosity and reliable flange sealing. Henkel lists a Brookfield viscosity range of approximately 10,000 to 35,000 mPa·s at 25°C. This gel-like consistency supports continuous bead application and screen-printing processes without excessive running. The product is intended for close-fitting flanges with gaps up to approximately 0.25 mm, helping it conform to machining marks and minor surface variation.
After curing, the sealant forms a durable acrylic gasket that supports consistent sealing across the flange interface. Published data lists a lap-shear strength of approximately 3.6 N/mm² on grit-blasted steel and a service-temperature range from about -55°C to 150°C. Its medium-strength formulation makes it suitable for dependable industrial gasketing where resistance to operating heat and fluid exposure is required.
Applications for LOCTITE 549 Flange Sealant
LOCTITE 549 Flange Sealant is recommended for rigid steel and aluminum flange assemblies used in industrial machinery, automotive systems, transmissions, pumps, compressors, and powertrain equipment. It can replace conventional cut gaskets in suitable close-fitting joints, reducing gasket inventory and allowing the seal to follow the exact flange shape. Operators can apply a continuous bead around bolt holes and along the required sealing path before assembling the components.
Performance depends on metal type, gap size, surface cleanliness, temperature, assembly time, and operating fluids. The product is not normally recommended for thermoplastic components because stress cracking may occur. Users should also avoid pure oxygen, oxygen-rich systems, chlorine, and other strong oxidizing materials. Representative testing is recommended before production use or critical service.
How to Apply LOCTITE 549 Flange Sealant
Clean both flange surfaces and remove grease, oil, dust, old gasket residue, moisture, and loose contamination. Apply LOCTITE 549 Flange Sealant as a continuous bead to one flange, surrounding bolt holes and following the required sealing path. Assemble the components promptly and tighten the fasteners as soon as possible to avoid creating an unintended spacing or shimming effect.
Keep the joint correctly aligned while the product cures. Cure speed varies according to substrate activity and ambient temperature, so sufficient time should be allowed before full operating pressure, elevated temperature, or demanding service. Low-pressure leak testing may be completed immediately after assembly when permitted by the validated production or maintenance process.
Storage and Safety of LOCTITE 549 Flange Sealant
Store LOCTITE 549 Flange Sealant in its unopened original container in a dry location. The preferred storage range is 8°C to 21°C, and prolonged exposure below 8°C or above 28°C may affect product properties. Do not return dispensed material to the original package. Use suitable ventilation and personal protective equipment, avoid skin and eye contact, and consult the latest safety data sheet before handling.
For manufacturers and maintenance teams seeking a practical formed-in-place gasket, LOCTITE 549 Flange Sealant provides no-mix processing, controlled application, instant low-pressure sealing, and dependable performance on close-fitting metal flanges. Explore our industrial flange sealants for pumps, compressors, transmissions, gear housings, axle covers, and machinery maintenance.
