Sealing seams and welds with anaerobic adhesives

Laurie Gibbons
Adhesive Types, Anaerobic Adhesives
June 9, 2016

Anaerobic adhesives are the preferred method for threadlocking, thread sealing, retaining, and gasketing. Reasons include strength, vibration resistance, corrosion prevention, and sealing. In addition to the applications listed above, anaerobic adhesives seal seams and welds.

Permabond HL126

Although the bottle may call it a threadlocker, wicking grade anaerobic threadlockers like Permabond HL126 seal porosity leaks on all types of welds. The process for sealing welds in fire protection systems is here HL126 . Although it is similar for welds on various items. The weld sealing process for large items such as paper processing vats is slightly different due to the vast size. Simply apply with paint brushes or sponges for the large welds.  Crimped 55 gallon drum can be reconditioned by post-applying HL126 sealant around the rim. This wicks into the crimp for a leak-free drum. In Europe, the product Permabond A126 is more readily available. It has a water-like viscosity and is ideal for post-assembly application and for wicking into porous welds.

Other seams, such as those on galvanized watering cans, are sealed by running a retaining compound down the edge of the seam and wicking around the joint at the bottom. Then invert the can to wick around the top half.

Permabond HH040

Similarly, Permabond® HH040 is a single component anaerobic adhesive that is instant sealing, gap filling, high viscosity, “green” anaerobic adhesive trusted for sealing the rolled seam during the manufacturing of spin on fluid filters. Fluid filter manufacturers worldwide have specified Permabond HH040 as their rolled seam sealant when attaching the nut plate to the can to achieve a 100% seal. Applying the adhesive inside the seam in this manner is ideal for fluid filters.

For further help and advice, please contact Permabond.

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