Anaerobic
Anaerobic adhesives and sealants come in a variety of strengths to suit the application requirements
Anaerobic adhesives, sometimes called threadlockers or retaining compounds, are one-part adhesives that cure on active metal surfaces in the absence of oxygen in the bond line. The requirement for lack of oxygen means these chemistries do not bond well to glass, plastic or rubber. These products reduce maintenance and leakage to help keep factories running efficiently.
The cure mechanism of an anaerobic adhesive (or anaerobic sealant as they are often referred to) is triggered when it comes into contact with a metallic surface. This will cause the anaerobic adhesive to gel and cure. To facilitate full cure, the anaerobic adhesive needs to have exclusion of oxygen in combination with contact with a metal. With both these boxes ticked, the reactive molecules inside the liquid adhesive become activated which triggers the curing mechanism, causing the monomers to polymerise and create a solid.
They are generally fairly rigid with a high tensile and compressive strength making them ideal for threadlocking nuts and bolts, retaining bearings into housings, gasketing between two metal flanges or pipe sealing threaded pipe joints. They are less suited to structural bonding where there could be large flat areas for bonding where flexibility or peel forces acting on the joint.
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