LOCTITE 515 is a high-viscosity flange sealant designed for close-fitting flanged parts, providing a gasket-free seal on rigid metal joints. For composite fabricators and industrial assemblers who already source resins, gasket dressings, and instant adhesives from Thousands Technology, LOCTITE 515 fills a role where a thick, gap-filling sealant is needed for tight-tolerance flange assemblies rather than a thin bond-line adhesive. This page summarizes the documented properties and application steps for this sealant to support sourcing decisions.
Typical Properties of LOCTITE 515 (Uncured Material)
The properties below are documented for the uncured material and help buyers confirm fit before specifying it for a given flange assembly.
| Property | Typical Value |
|---|---|
| Specific Gravity @ 25 °C | 1.1 |
| Viscosity, Brookfield HBT (25 °C, Spindle TB, 0.5 rpm, Helipath) | 700,000 to 1,700,000 mPa·s (cP) |
| Viscosity, Brookfield HBT (25 °C, Spindle TB, 5.0 rpm, Helipath) | 150,000 to 375,000 mPa·s (cP) |
| Flash Point | See SDS |
LOCTITE 515: Application Steps for Flange Sealing
Correct flange fit and application technique are essential for getting a reliable seal from this product. The documented directions for use are as follows:
- For best performance, bond surfaces should be clean and free from grease.
- This sealant is designed for close-fitting flanged parts with gaps up to 0.25 mm (0.01 in).
- Apply manually as a continuous bead, or by screen printing, to one surface of the flanges.
- Low pressures (under 0.05 MPa, 7.3 psi) may be used when testing to confirm a complete seal immediately after assembly and before curing.
- Flanges should be tightened as soon as possible after assembly to avoid shimming.
Flange Gap Tolerance Considerations
Because LOCTITE 515 is formulated for gaps up to 0.25 mm, assemblies with wider or uneven flange clearances may not achieve a complete seal with this product alone. Machining tolerances on the flange faces should be checked before specifying this sealant for a production run, particularly on cast or fabricated parts where flatness can vary. Where gaps exceed the recommended range, a gasket or a different sealing approach may be a better match.
Why Consistent Sourcing Matters
Composite fabricators and assemblers who use this product across multiple production runs benefit from consistent viscosity and cure behavior batch to batch. Variation in these properties can affect how predictably a flange sealant applies and seals on the line, which is why buyers sourcing this product for repeat use should confirm supply continuity with their supplier before committing to large orders.
Where to Source LOCTITE 515
Thousands Technology provides supply chain resource support for recommended international brand products, including LOCTITE 515, 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 515
What is LOCTITE 515 used for?
It is used as a flange sealant for close-fitting flanged parts, forming a gasket-free seal on rigid metal joints.
What flange gap does LOCTITE 515 work best with?
It is designed for gaps up to 0.25 mm (0.01 in).
How is LOCTITE 515 applied?
It is applied manually as a continuous bead, or by screen printing, to one surface of the flanges before assembly.
Can the seal be tested before it cures?
Low pressures under 0.05 MPa may be used to confirm a complete seal immediately after assembly and before curing.
For pricing, SDS documentation, or supply chain support for LOCTITE 515, contact Thousands Technology’s sourcing team to discuss your project requirements.
