Why Anti-Stick Coating is Essential for Gaskets with Specific Applications

02 December 2019

Anti-stick compounds coat gaskets so that maintenance techs can easily remove aging ring seals. If fibre or polymer reinforced gaskets didn’t include non-stick plating, how could a tech remove a used seal? Remember, when it was installed, torque-tensioned bolts crushed the material against two flange faces. Sure, that action does prevent pressurized fluids from creating a leakage pathway, but a cost is exacted after the fastener tightening work is done.

Anti-Stick Gasket Coatings Serve the Maintenance Sector

Upon watching someone tightening the bolts around a pair of flanges, it’s hard to believe this joint could be anything less than a permanent fitting. Masses of torque are pattern-tightened around the flanges. The gasket inserted between those faces is compressed until not one single drop or wisp of pressurized fluid can escape. Only, what if the pipe connection needs to be disassembled for some reason? Maybe a new generation of gaskets is taking over, or maybe the current seal is aging badly. If the flanges separate, after the bolts have been uncoupled, of course, then that obsolete material ring shouldn’t be impossible to remove. Even though it was compressed by unimaginable mechanical forces, an anti-stick coating should be in place so that an outmoded gasket can be removed without any kind of hassle whatsoever.

Employed as a Creep Relaxation Arbitrator

The case described in the above text is easy enough to picture. Surfaces and materials stick when they’re squeezed into a thinner shape for any length of time. How about the installation headaches encountered during a gasket’s installation, though? As the hard metals and tough fibres are crushed between two flange faces, they begin to spread. The squeezing mechanical force causes a gasket to thin and move outwards to the edge of the flanges. Usually, there’s nothing to worry about when this wholly expected spreading action occurs. However, static surfaces can “catch” or “seize up” when they spread over rough flange grains. When this happens, a gasket experiences strain. It distorts slightly and weakens. By coating gaskets in anti-stick coatings, they expand evenly under the crushing pressure. No creep distortion will take place when a gasket slips evenly under the compressive tightening pressure.

There are two primary reasons for adding a non-stick gasket coating. The finish performs as a creep relaxation compensation mechanism. As the flange fasteners tighten, a fitted gasket expands evenly. Essentially, that ring remains circularly shaped, even when it’s exposed to great compressive energies. Secondly, anti-stick finishes allow maintenance services to do their jobs without any gasket-sticking impediment getting in their way. The old gasket slips free. Otherwise, sticking stubbornly to the flanges, this work might just require the services of an abrasive tool, one that could possibly damage the flange faces.

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