Sealing seams and welds with anaerobic adhesives
Anaerobic adhesives are preferred method for threadlocking, thread sealing, retaining, and gasketing for a variety of reasons including strength, vibration resistance, corrosion prevention, and sealing. In addition to the applications listed above anaerobic adhesives are called upon as sealants for other purposes as well, including seam and weld sealing.
Although the bottle may call it a threadlocker, wicking grade anaerobic threadlockers like Permabond HL126 are used on all types of welds to seal porosity leaks. The process for sealing welds in fire protection systems can be found here although it is similar for welds on various items, the weld sealing process for large items such as paper processing vats is modified slightly for the vast size – paint brushes and sponges can be used for application to large welds. Crimped 55 gallon drum seals can be reconditioned by post-applying HL126 sealant around the rim. This wicks in to seal 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.
Similarly Permabond® HH040 is a single component anaerobic adhesive which is designed as a retaining compound. It is an 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 manufactures 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.
Other seams such as those on galvanized watering cans are sealed by allowing a thinner retaining compound to run down the edge of the seam and wick around the joint at the bottom – the can is then inverted so the anaerobic adhesive can wick around the top half.
For further help and advice, please contact Permabond.