CNA or Compressed Non-Asbestos Gaskets: Most Common Uses and Applications

16 March 2018

Compressed Non-Asbestos gaskets go where that heat-resistant but potentially deadly silicate mineral cannot. Shortened to CNA, the following gasketing materials are every bit as thermally capable as that now defunct fibre, plus they’re chemically inert. Let’s check out some common applications, places where these fibre-based products function as entirely safe gasket materials.

High-End HVAC Sector 

Far away, at the terminating end of this heat chain, hot radiators sip water from a multi-storied heating system. There are no CNA gaskets in range here. No, they’re located way back at the first-stage boiler room. The flames are licking around a tiny window above the furnace, all while the aramid fibres produce a formidable layer of heat-restraining weave around the pressurised vessel. The temperature might be topping the 260°C mark in there, but the nitrile-bonded gasket resolutely endures.

Robust Power Generation Barriers 

Utilized in the generation of electrical energy, this particular application has much in common with the boiler and furnace scenario mentioned above. Only this time, we’re referring to the pressurized realms and super-heated steam that powers massive turbines. Water, the source fluid medium, is heated by some heavy fuel source, perhaps a nuclear reactor or crushed coal. The steam generates motive force, it circulates a special chamber at high velocity, and the resulting force impacts a series of spinning turbine blades. Like a jet engine, the energy creates massives amounts of rotating torque. CNA or Compressed Non-Asbestos Gaskets are equipped to deal with this form-crushing quantity of thermal energy.

Introducing Caustic-Qualified CNA Gaskets 

In furnaces and industrial boilers, compressed non-asbestos fibreglass seals prevent seal breaches. Meanwhile, out on a distant offshore installation, the same gaskets are handling raw petroleum. At the other end of the processing chain, blended aramids and fillers are bonded to EPDM (Ethylene Propylene Diene Monomer), a synthetic rubber that can take a great deal of punishment. The die cut substance is inserted into a flanged joint that conveys petroleum-based fluids and pressurized gasses. Further away, a cryonics facility is utilizing the same gasket class while a caustically active food processing factory is pumping a vinegary substitute towards its final destination.

This has been something of a whirlwind journey. We’re dizzy from visiting oil platforms and chemical processing facilities. Then the journey caused whiplash to the neck as we sped over to a food processing site and a material refrigeration plant. Even a wastewater treatment installation, a place that transforms raw sewage into potable water, gets a mention, for CNA gaskets function under the most adverse conditions imaginable.

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