Overview
LOCTITE 577 is an anaerobic pipe thread sealant supplied as an uncured paste with a specific gravity of 1.1 at 25°C. As one of the recommended international brand products in our auxiliary agent range, this sealant is supplied with supply chain resource support for fabricators who need a reliable, ready-to-use sealing solution for metal pipe fittings.
Typical Properties of LOCTITE 577 (Uncured Material)
- Specific gravity @ 25°C: 1.1
- Viscosity, Brookfield RVT, 25°C, spindle 6, speed 2.5 rpm: 70,000-130,000 mPa·s (cP), LMS
- Viscosity, Brookfield RVT, 25°C, spindle 6, speed 20 rpm: 16,000-33,000 mPa·s (cP), LMS
- Flash point: see SDS
Why Anaerobic Pipe Sealants Matter
Anaerobic sealants like this product cure only in the absence of air, once confined between the mating metal surfaces of a threaded fitting. This mechanism allows the sealant to remain workable as a paste during assembly, then harden fully inside the thread engagement to fill voids and prevent leak paths, without the shrinkage or drying-related gaps that can occur with tape or paste sealants that rely on solvent evaporation. Because cure only initiates once air is excluded, uncured product left on external surfaces stays workable and can be wiped away, which supports a cleaner assembly process. This chemistry is one reason anaerobic thread sealants are widely used across petrochemical piping, hydraulic and pneumatic fittings, and marine vessel plumbing systems where a dependable, instant low-pressure seal is needed before full cure develops.
Directions for Use
For Assembly
- For best results, clean all surfaces (external and internal) with a LOCTITE cleaning solvent and allow to dry.
- 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.
- 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 the product amount accordingly and apply a 360° bead of product on the female threads also.
- Using compliant practices, assemble and wrench tighten fittings in accordance with manufacturer recommendations.
- 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
- Remove with standard hand tools.
- Where hand tools do not work because of excessive engagement length or large diameters (over 1 inch), apply localized heat to approximately 250°C (480°F). Disassemble while hot.
For Cleanup
Cured product can be removed with a combination of soaking in a LOCTITE solvent and mechanical abrasion such as a wire brush.
Where to Source This Product
Thousands Chemicals connects fabricators and maintenance teams with LOCTITE 577 and related auxiliary agent products through our digital B2B marketplace. Our team can help confirm packaging, lead times, and technical documentation for your target application and order volume.
FAQ
What is LOCTITE 577 used for?
It is an anaerobic pipe thread sealant used to seal metal pipe fittings, curing in the absence of air once confined between the mating threads.
How long does this sealant take to cure?
Properly tightened fittings seal instantly to moderate pressures, while a minimum of 24 hours is recommended for maximum pressure resistance and solvent resistance.
How is LOCTITE 577 removed for disassembly?
Standard hand tools work in most cases; for larger diameters over 1 inch or excessive engagement length, applying localized heat to approximately 250°C (480°F) allows disassembly while hot.
What is the viscosity of this sealant?
At 25°C, Brookfield RVT viscosity (spindle 6) ranges from 70,000-130,000 mPa·s at 2.5 rpm to 16,000-33,000 mPa·s at 20 rpm.
Can you provide technical documentation and bulk pricing?
Yes, technical data sheets and SDS documentation are available on request, and our team can provide bulk pricing and lead times based on your target volume and delivery location.
Get a Quote for LOCTITE 577
Contact our team for a quote, technical data sheet, or SDS for LOCTITE 577. We support bulk supply and global shipping for fabricators and maintenance teams sourcing anaerobic pipe thread sealants.
