Adhesives - Glues

Frequently asked questions — Adhesives and Glues

• How do you choose between the different Loctite anaerobic adhesives for threadlocking?

  The choice of Loctite reference depends on the level of strength required for the assembly. The 222 range offers low strength for hand-removal, while the 243 is the standard for medium strength. For permanent high-strength fixings, the 270 series is preferred, whereas the 277 is specifically dedicated to very high strengths on large diameters.
• Which solution should be chosen for sealing pipe threads?

  Anaerobic adhesives from the 500 series replace PTFE tape for sealing. The 542 reference is suited to fine threads, while the 577 is appropriate for standard threads. For stainless steel threads or those containing PTFE, the 567 reference is recommended to ensure the required sealing under these specific conditions.
• When should cyanoacrylate adhesives be preferred over two-component epoxies?

  Cyanoacrylates, such as the 401, 406 or 480 models, cure within seconds on contact with surface moisture, making them ideal for the rapid assembly of small parts, prototyping or temporary fixings. Conversely, two-component epoxies such as the EA 9492 or EA 3463 references offer the highest mechanical and chemical resistance, being recommended for structural assemblies and heavy-duty repairs requiring a longer curing time.
• Which type of adhesive should be used for mounting cylindrical fits such as shafts or bearings?

  For bonding cylindrical fits, the industrial standards are Loctite 638 and 660 adhesives. The 638 reference is selected for its high mechanical strength contribution. The 660 model, for its part, is specifically used as a gap filler to ensure the integrity of the assembly when tolerances require compensation.
• Why use MS polymers rather than rigid adhesives for bodywork?

  MS polymers and polyurethanes, such as the Sikaflex or Mastic SP ranges, combine bonding and sealing functions while retaining high flexibility. This property is essential for applications on chassis, bodywork or in the transport sector. Unlike structural adhesives, these products are solvent-free, UV-resistant and allow a painted finish.
• Which product should be used for sealing in high-temperature environments?

  For applications requiring sealing in high-temperature environments, RTV silicones are the reference option. These products are designed to retain their technical properties across a service temperature range from -60 to +250 degrees Celsius. They are also recommended for electrical applications requiring specific insulation or protection.