LOCTITE® adhesive fills the gaps 04 May 2021

LOCTITE® adhesive gasketing has become a proven solution for one manufacturer of cast iron gearboxes and geared motors. The manufacturer approached Henkel as it found a poor seal was causing substantial leakage. Working together with the manufacturer Henkel suggested the LOCTITE® 518 to eliminate the leak.

For a gasket to do its job effectively, it is essential that the seal it creates remains intact over a long period of time. The gasket must also be resistant to fluids and/or gases and withstand the operating temperatures and pressures to which it is subjected. For many applications, these qualities are best achieved with adhesive gasketing products in preference to pre-cut, compression gaskets.

The main reasons why compression gaskets leak or fail are poor surface contact and their tendency to relax under load and decrease in thickness, with subsequent loss of bolt tension in the flange joint. High stresses on the gasket can also cause it to crack, tear, rupture or to be squeezed out between the flanges.

By comparison, a liquid gasketing product fills all voids to create a perfect seal between components, with maximum face-to-face contact, eliminating flange face corrosion. It has high resistance to solvents; resists high pressure when cured; and there is no need for retorquing.

A wide range of adhesive gasketing products are available for different flange types, gap sizes, and material, but careful consideration of the performance criteria is essential as one manufacturer of cast iron gearboxes and geared motors can attest. Although the manufacturer had opted for liquid gasketing on the adapter assembly flange, the adhesive was causing issues in both production and long-term reliability of the end product.

It was estimated that a poor seal was causing a 5% leakage rate. This was proving costly due to testing and production delays caused by the adhesive’s slow cure rate and also leakage related warranty claims on purchased units. The adhesive also made it difficult to dismantle the geared motor for maintenance and repair.

Having reassessed its technical requirements and trialled alternative brands, the manufacturer found a LOCTITE® gasket sealant met all performance criteria. The product chosen was LOCTITE 518, which effectively fills the gaps between the flange surfaces and cures quickly so close fitting parts can be instantly pressure tested to 276 kPa (40 psi). Leaks have now been eliminated and disassembly is easier for customers. 

Formulated for rigid iron, steel and aluminium flanges, LOCTITE 518 is applied as a continuous bead or by screen printing to one flange surface. A roller pen version is also available. 


Deputy Editor

Claire Aldridge Deputy Editor t: +44 (0) 1727 743 889


Having joined the magazine in 2012, Claire developed her knowledge of the industry through the numerous company visits, exhibitions and conferences she attended both in the UK and abroad.

Claire prides herself on keeping readers well informed and up to date with the latest industry news.