LOCTITE 573 is a high-viscosity anaerobic pipe thread sealant formulated for sealing metal pipe fittings under moderate to high pressure. For composite fabricators and industrial assemblers who already source resins, gasket dressings, and other sealants from Thousands Technology, LOCTITE 573 fills a role where instant low-pressure sealing combined with a full anaerobic cure is needed for threaded pipe connections. This page summarizes the documented properties and application steps for this sealant to support sourcing decisions.
Typical Properties of LOCTITE 573 (Uncured Material)
The properties below are documented for the uncured material and help buyers compare this sealant against other pipe thread sealants for a given application.
| Property | Typical Value |
|---|---|
| Specific Gravity @ 25 °C | 1.25 |
| Viscosity, Brookfield RVT (25 °C, Spindle 6, 2.5 rpm) | ≥38,000 mPa·s (cP) |
| Viscosity, Brookfield RVT (25 °C, Spindle 6, 20 rpm) | 13,500 to 33,000 mPa·s (cP) |
| Flash Point | See SDS |
Application Steps for LOCTITE 573
Correct application technique on the threads is essential for getting a reliable pressure seal. The documented directions for use are as follows:
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 a Loctite primer such as SF 7471 or SF 7649 and allow to dry.
- Apply a 360-degree bead of product to the leading threads of the male fitting, leaving the first thread free, and force the material into the threads to fill the voids. For bigger threads and voids, adjust the amount accordingly and apply a bead to the female threads as well.
- 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 and Cleanup
- Remove with standard hand tools where possible.
- 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) and disassemble while hot.
- Cured product can be removed with a combination of soaking in a Loctite solvent and mechanical abrasion such as a wire brush.
Pressure Sealing and Cure Time
Because this sealant seals instantly to moderate pressures once fittings are properly tightened, assembly teams can proceed with low-pressure testing shortly after installation. Full pressure and solvent resistance, however, depends on a minimum 24-hour cure, so buyers scheduling pressure testing or shipment should build this window into their production planning, particularly on inactive metals where a primer step adds handling time before assembly.
Why Consistent Sourcing Matters
Composite fabricators, pipe and tank manufacturers, and industrial assemblers who use this sealant across multiple production runs benefit from consistent viscosity and cure behavior batch to batch. Variation in these properties can affect how predictably a thread sealant applies and seals under pressure, which is why buyers sourcing LOCTITE 573 for repeat use should confirm supply continuity with their supplier before committing to large orders.
Where to Source LOCTITE 573
Thousands Technology provides supply chain resource support for recommended international brand products, including LOCTITE 573, alongside a broader range of auxiliary agents and sealing products for composite and industrial assembly applications. For sealant performance standards and test methods referenced across the industry, buyers can review the applicable ASTM standards for adhesives and sealants.
Documentation
Safety data, flash point details, and handling precautions are provided in the manufacturer’s SDS. Buyers should request the current SDS and technical data sheet before finalizing an order to confirm the specification matches their application.
FAQ: LOCTITE 573
What is LOCTITE 573 used for?
It is used as a high-viscosity anaerobic pipe thread sealant for sealing metal pipe fittings under moderate to high pressure.
How is LOCTITE 573 applied?
It is applied as a 360-degree bead to the leading threads of the male fitting, then the fitting is assembled and wrench-tightened.
How long does full cure take?
Fittings seal instantly to moderate pressures once tightened, but maximum pressure and solvent resistance require a minimum 24-hour cure.
How is a cured fitting disassembled?
Standard hand tools work in most cases; larger diameters over 1 inch may require localized heat to approximately 250 °C (480 °F).
For pricing, SDS documentation, or supply chain support for LOCTITE 573, contact Thousands Technology’s sourcing team to discuss your project requirements.
