Sealants Are Filling the Gaps Left by Gaskets

Posted on 5/27/2020 1:16:38 PM By ASC

As adhesives increasingly take over the duties of mechanical fasteners in assemblies, sealants are joining them by staging a similar takeover with regard to mechanical gaskets. Armed with tubes, gel pens, cartridges and Aerosol cans, they are filling the gaps and hardening the join between flanges with resilient and high-performance seals.

The Loctite liquid gaskets range offers both anaerobic and RTV liquid gasket options to meet the varying needs required by different flanges. Variables include not only whether the flanges are rigid or stamped, but also the size of the gap between them that needs to be sealed, the pressure required, and the temperature resistance involved.

According to the company, while mechanical gaskets call for different-sized gaskets to fit different parts, and show tendencies to lose elastic properties, decrease resilience, become thinner due to stress, and can become corroded, liquid gaskets maintain fastener tension, prevent corrosion, distribute stress evenly, and are easy to apply without the need for re-torquing.

The anaerobic sealant is recommended for use on iron, aluminium and steel flanges whether rigid or machined, and is temperature resistant up to 400°F. It offers high strength and flexibility, is water and glycol resistant, and seals instantly although its anaerobic full cure can take 24 hours. The RTV silicone flange sealant for use on stamped flanges of any type, including sheet metal, is applied as a spray. It resists even higher temperatures of up to 725°F, and cures within about 20 minutes.

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