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What is creosote and why is it so dangerous?

Updated: Apr 12, 2018




Co-Mate Chimney Cleaner is very effective at neutralizing and destroying dangerous creosote deposits. Creosote accumulates in the chimney of any heating appliance using wood, coal or oil as a fuel. Without proper maintenance, these deposits can be very dangerous. Creosote can easily reignite inside a chimney completely undetected until it’s too late, resulting in devastating fires that cause significant property damage and/or loss of life.


“Creosote can easily reignite inside a chimney completely undetected”

So what is this creosote?


In every naturally occurring carbon-based fuel (such as wood, coal, oil, and to a lesser extent natural gas and propane), there exists non-volatile compounds that will remain after the fuel ignites and burns to completion. In a domestic wood-stove or fireplace, most of this ash settles on the floor, or falls below the floor, of the combustion chamber. A small amount of these ash particles are carried in the smoke from the fire, traveling up the chimney.

In a domestic environment, wood-burning is seldom a completely efficient process. A small amount of the carbon compounds in the fuel escape up the chimney without being burned. These compounds combine with the ash materials in the smoke as it travels up the chimney. As these materials get further from the fire, they cool and become a sticky black substance that adheres to the inside walls of the chimney. This substance is commonly known as creosote.



“You should always get regular chimney inspections ”

Over time, creosote accumulates and if left untreated it becomes an ever increasing fire hazard. The accumulated unburned carbons in the creosote eventually become, for all intents and purposes, a fuel lining the inside of your chimney. Inevitably, this fuel will eventually ignite once enough heat from the fire below reaches the creosote deposits.


You should always get regular chimney inspections to keep this threat in check, using Co-Mate Chimney Cleaner on a regular basis can virtually eliminate dangerous creosote buildup. In the end, it is up to you to make sure creosote buildup does not reach dangerous proportions.

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