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What Is Carbon Residue?

Helen Akers
Updated May 21, 2024
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Carbon residue is the amount of carbon that is made by a chemical process, such as heating up oil. It is mainly considered to be a by-product of fuel. When gasoline is burned and used by a motor vehicle engine, it produces exhaust that contains carbon monoxide. Carbon residue is what the leftover particles of a fuel product are transformed into. There are tests that can determine the amount of residue that remains after certain fuels are heated or burned.

The test method that is used to calculate the amount of carbon residue is known as Ramsbottom Carbon Residue (RCR). This test is used to determine how much residue a fuel is likely to leave. It also helps calculate the fuel's tendency to combust or burn.

Residue can also be calculated as the Micro Carbon Residue (MCR) or the Conradson Carbon Residue (CCR). Both of these methods are equivalent in that they return the same numerical value. The test is conducted by placing a small amount of fuel oil into a glass container. As the glass is heated within a certain temperature range, the weight is calculated and subtracted from what the glass weighed prior to being heated.

High amounts of residue can be damaging to the environment. For example, high levels of carbon monoxide can lead to an increase in the concentration of greenhouse gases in the atmosphere. These gases are thought to contribute to global warming — an overall increase in the average earth temperature over decades.

Carbon residues can also be life threatening or poisonous. Exposure to high amounts of carbon monoxide can lead to brain and cellular damage, including death by asphyxiation. It is considered to be a pollutant and certain fuels may result in higher amounts of residue than others. Additives, such as ethanol, may be mixed into certain types of fuel to reduce the amount of carbon deposits.

Residues are usually only formed when the fuel oil reaches high temperatures. Machinery plants, vehicles and the majority of home heating systems all use some type of fossil fuel that produces a residue when heated. Some engine components may accumulate carbon deposits over time that may need to be periodically removed in order to maintain optimum performance. Chemicals such as fuel injection cleaners can help remove some of the deposits that may be the root cause behind engine stalling and rough starts.

All The Science is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Helen Akers
By Helen Akers
Helen Akers, a talented writer with a passion for making a difference, brings a unique perspective to her work. With a background in creative writing, she crafts compelling stories and content to inspire and challenge readers, showcasing her commitment to qualitative impact and service to others.
Discussion Comments
By Glasis — On Feb 12, 2014

Since carbon monoxide is odorless and can be deadly, it is important to have your furnace checked and cleaned routinely.

Most furnace maintenance companies recommend a cleaning once a year.

Standard testing can reveal cracks and leaks that could lead to increased carbon monoxide levels in your home.

If a problem is found, the technician will measure the carbon monoxide level in your home.

If it is at a dangerous level, your furnace may need to be turned off, repaired or replaced immediately, and you may be required to leave your home until the readings return to normal.

It may be an inconvenience, but it could also save the lives of you and your family.

Helen Akers
Helen Akers
Helen Akers, a talented writer with a passion for making a difference, brings a unique perspective to her work. With a...
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