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Typically used to augment the seal or holding force of a mechanically joined assembly, anaerobic adhesives are used as threadlockers, thread sealants, retaining materials and flange sealants. When designed into an assembly, these adhesives reduce component inventories, decrease total manufacturing costs, enhance equipment reliability, and minimize aftermarket breakdown and associated warrantee problems.

By definition, anaerobic adhesives remain liquid until isolated from oxygen in the presence of metal ions, such as iron or copper. For example, when an anaerobic adhesive is sealed between a nut and a bolt on a threaded assembly, it rapidly “cures” or hardens to form a tough cross-linked plastic with tenacious adhesion to many metals. Though anaerobic applications differ widely, in most cases the adhesive provides high shear strength.

  • When used to lock threaded assemblies together, anaerobic adhesives prevent loosening and corrosion of the fastener, maintain proper clamping force, and offer controlled torque for removal of the assembly.

  • For rigid cylindrical assemblies, such as joining a bearing onto a shaft, anaerobic adhesives known as retaining compounds enable manufacturers to bond parts that once could only be assembled using press fits or shrink fits.

  • Anaerobic gasketing materials are widely used as formed-in-place gaskets that produce leak-proof seals between mating flanges, preventing leakage of moisture, gasses, fluids or contaminants.


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