LOCTITE® 577

LOCTITE®577™ is designed for the locking and sealing of metal threaded pipes and fittings. Particularly suitable for use on stainless steel without the need for surface activation. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. The thixotropic nature of LOCTITE®577™ reduces the migration of liquid product after application to the substrate. LOCTITE® 577™ provides robust curing performance. It not only works on active metals (e.g. brass, copper) but also on passive substrates such as stainless steel and plated surfaces. The product offers gap performance to 0.25 mm (0.01 in), high temperature performance and contamination tolerance. It cures in the presence of minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids and cleaners containing surfactants and corrosion inhibitors.

TYPICAL PROPERTIES OF UNCURED MATERIAL

Specific Gravity @ 25 °C1.1
Viscosity, Brookfield – RVT, 25 °C, mPa·s (cP):
Spindle 6, speed 2.5 rpm
70,000 to 130,000LMS
Viscosity, Brookfield – RVT, 25 °C, mPa·s (cP):
Spindle 6, speed 20 rpm
16,000 to 33,000LMS
Flash PointSee SDS

Directions for Use

For Assembly
1. For best results, clean all surfaces (external and internal) with a LOCTITE® cleaning solvent and allow to dry.
2. If the material is an inactive metal or the cure speed is too slow, spray with LOCTITE® SF 7471™ or LOCTITE® SF 7649™ and allow to dry.
3. Apply a 360° bead of product to the leading threads of the male fitting, leaving the first thread free. Force the material into the threads to thoroughly fill the voids. For bigger threads and voids, adjust product amount accordingly and apply a 360° bead of product on the female threads also.
4. Using compliant practices, assemble and wrench tighten fittings in accordance with manufacturers recommendations.
5. Properly tightened fittings will seal instantly to moderate pressures. For maximum pressure resistance and solvent resistance allow the product to cure a minimum of 24 hours.
For Disassembly
1. Remove with standard hand tools.
2. Where hand tools do not work because of excessive engagement length or large diameters (over 1″), apply localized heat to approximately 250 °C (480F). Disassemble while hot.
For Cleanup
1. Cured product can be removed with a combination of soaking in a LOCTITE® solvent and mechanical abrasion such as a wire brush.

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LOCTITE® 573

Brand: Henkel
Technology:Acrylic
Chemical Type: Dimethacrylate ester
Appearance (uncured):Green pasteLMS
Fluorescence:Positive under UV lightLMS
Components:One component- requires no mixing
Viscosity:Medium, thixotropic
Cure: Anaerobic
Secondary Cure:Activator
Application: Gasketing and Sealing

LOCTITE® 515

Brand: Henkel
Technology:Acrylic
Chemical Type: Methacrylate ester
Appearance (uncured):Opaque, dark purpleLMS
Fluorescence:Positive under UV lightLMS
Components:One component- requires no mixing
Viscosity:High
Cure: Anaerobic
Application: Sealing

LOCTITE® 620

Brand: Henkel
Chemical Type: Methacrylate ester
Appearance (uncured):Green liquidLMS
Components:One component- requires no mixing
Viscosity:High
Cure: Anaerobic
Secondary Cure:Activator
Application:Retaining
Strength: Medium to High

LOCTITE® 648

Brand: Henkel
Technology:Acrylic
Chemical Type: Urethane methacrylate
Appearance (uncured):Green liquidLMS
Fluorescence:Positive under UV lightLMS
Components:One component- requires no mixing
Viscosity:Low
Cure: Anaerobic
Secondary Cure:Activator
Application:Retaining
Strength: High

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