6.6.2 Anaerobic Gasketing Adhesives

These adhesives are essentially a form-in-place (FIP) liquid gasket which cures after parts are assembled. These gasket products are applied as a liquid on one part of the metallic substrate or flange joint surface; when parts are assembled, the anaerobic gasket material flows into voids, filling the gap and forming a durable seal after curing by the anaerobic mechanism.

These adhesives are used in many markets and industries. They are convenient to dispense manually, semi-automatically or automatically, and they add structural strength to assemblies, eliminate compression set and fastener loosening, and allow true unitised assembly against slip and creep.

Figure 187 Microscopic studies reveal that actual metal-to-metal contact between the most carefully finished interfacing parts does not exceed 25-35%. Anaerobic gasket adhesives fill 100% of the gaps

The following are some additional benefits of anaerobic gasket adhesives:

  • No gasket relaxation
  • No shimming
  • Structural strength
  • Excess material remains liquid and can be easily removed
  • Accommodates poor surface finish
  • No cure before assembly
  • Reduce inventory costs
  • Chemical compatibility
  • High temperature resistance (up to 204°C (400°F))
  • Easy repairability

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