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Some time ago, a successful UK filtration company worked out that the hot gas filters it was installing in its filtering systems weren't really up to the job.
The traditional bag filters they had been using performed fine up to a point – but they became a fire risk at the extreme end of the temperature scale (heading up towards 450 degrees Centigrade, which anyone will agree is pretty damn hot) and didn't hold a very long usable life.

Understandable, really – hot gas filtering products are, as their name alone implies, expected to remove pollutants from gas streams that would kill a human instantly, were they exposed to them directly. These hot gas filters were doing OK, for a while – but the heat and Ceramic filter intense pressure caused them to deteriorate at a speed that the company in question (UK based Glosfume, Ceramic filter who had been making gas filtering systems for decades) felt insufficient for the tasks at hand.

The problem, basically, lay in the fact that industry emissions, which had been rising in tandem with increasingly heat intensive manufacturing processes, were overtaking the filtering technology designed to clean them.

Up to a point, these old style hot gas filters were holding their own – it was just that they were becoming increasingly costly to use because they kept having to be replaced. So Glosfume decided to design their own filters, Ceramic filter using ceramic rods in the filter unit instead of the bags that had preceded them.

The results were outstanding.

So much so that the ceramic filter is of the industry standard, its long life and superlative strength ensuring a constant stream of supply to every hot gas producing industrial plant in the world. The new filters last longer, they actually get stronger when they get hotter, and they clean 100% of known pollutants from the gas streams.
Hot gas filters are absolutely essential in hundreds of core industries across the globe.

Where a process or industry vents hot gas, one tends to find extremely toxic substances present – either as heavy metals, alloy by products or even biohazardous material. That's because hot gas venting is usually associated with destructive or disintegrative processes like cremation and incineration. Biological mass disposal, as the act of burning bodies is rather delicately named, requires intense heat for proper incineration – and translates whatever illnesses or contaminants were present in the body into smoke, which is of course a heated gas.

Hot gas filters used in crematoria ensure that no hazardous biological products enter the atmosphere from the smoke stacks – thereby ensuring the safety not just of the crematorium employees and visitors, but also of the people and wildlife in the surrounding area.
The same is true of waste metal plants, where (for example) aluminium stripping or the melting down of man made alloys in general can deliver some pretty horrendous chemical by products into the stream of exhaust gas.

The old style filters, of course, were capable of stopping a similar quantity of pollutants in their tracks – they just couldn't do it for long.

Ceramic hot gas filters have a useful life measured in years rather than months – and that means safe processes for less money.