Is Aerokroil Flammable?

In this blog, we will answer the following question: “Is Aerokroil flammable?”, and other important questions about the lubricant.

Is Aerokroil Flammable?

Yes, Aerokroil is very flammable. Most of its constituents are Petroleum-based, which are all flammable. Aerokroil is even more flammable than its liquid version.

What is Aerokroil?

Aerokroil is a penetrating and lubricant oil in aerosol, for industrial use. It is made with severely hydrotreated petroleum distillates, a low vapor pressure hydrocarbon, which can interact and create an oily mist that comes out as spray.

This way is possible to have similar effects to Kroil but in an aerosol form.


According to the manufacturer, Aerokroil is a Penetrant/ Lubricant for Industrial Use. There are many ways to effectively lose stuck metal parts, and using penetrant oils is one of them.

There are many ways a piece of metal can be loose. Applying brutal force or heat could lead to malfunction or make the parts seize.

Aerokroil can free stuck metal parts without the need for heat, doing it chemically. It helps remove the rust, corrosion, and paint from tiny openings, small as one-millionth of an inch.

It can be used to free nuts, bolts, pulleys, screws, bearings, shafts, valve guides, and any corroded parts. It can also act loosening frozen metal parts. 


Its composition is mainly oily but has carbon dioxide as a propellant. To understand its composition let’s first review a few important chemistry concepts. We assure you it won’t be too nerdy.


Anything you can put in a balance and weight is made of atoms. Ancient scientists had arranged them in the periodic table. You can think about it as ingredients to make nearly anything.

When two or more atoms are bonded concisely we name them as molecules. Organic molecules are nothing more than a specific arrangement of atoms that are mostly made of carbon and hydrogen, but other things could be attached to them.

Hydrocarbons are an even more specific family of chemicals. They are made entirely of hydrogen and carbon. We normally use them as fuels such as propane (kitchen gas) and octane (gasoline).


The smaller a hydrocarbon is, the more gas-like properties it’s going to have.

Although they have a very simple constitution, their uses are wide and their chemistry can be really complex. The more carbons a carbon chain has, the more it will become heavier. At some point, it will turn into an oily liquid, and furthermore, into a solid.

Carbon dioxide (CO2) although, is not a hydrocarbon since it’s made of carbon and oxygen. Most oxidations of organic matter oblige the carbon atoms within organic molecules to become CO2.

Therefore, CO2 itself is not flammable.

But what does oxidation means?

Well, oxidation is the name we give when something reacts chemically with oxygen. Other oxidation reactions take place without oxygen as well, but the oxygen reaction is so important that we named the others after it.

But what is important to us right now is the combustion. When something burns it means that oxygen is reacting with a source of fuel (comburent). 


So, the basic condition for a fire to even exist at some point is to have oxygen available. Once there is, this oxygen must be available to react, so as the hydrocarbon source.

What usually allows a fire to grow is heat. When something ignites, it can generate enough heat so the oxygen molecules keep being available later on, and the fire won’t extinguish unless fuel runs out.

A source of ignition can be heat, intense heat, sparks, the sun, or even friction. 

The fire itself is only a consequence of the chemical reaction. When we need to put down a fire we cease this oxygen reaction. On the other hand, to prevent a fire we must not give its starting tools in the first place.

You can think about fire as something that will always take place unless we prevent it. Or control it.


Aerokroil should never be applied on hot surfaces or near any source of ignition such as sparks and flames. 

If you have torched a certain metal surface trying to get a bolt loose or something similar, do not apply Aerokroil right after. 

First, wait until the heat decreases to room temperature. Aerokroil should always be used under mild conditions. Besides the flammability risk, the chemicals in the product may evaporate sooner which would lead to a loss of effectiveness.

Hazardous gases can also be released from a can of Aerokroil, especially after combustion, so keep it away from the fire. Read the label for further instructions.

Aerokroil shouldn’t be exposed to the sun. Prolonged exposures above 48°C (120°F) may cause the cans to burst.

The product should be applied only if there’s adequate ventilation. The vapors are heavier than air, so it might be harder for the solvent particles to rush away from the application area.

First Aid measures

The most dangerous risks are inhalation, ingestion, and eye and skin contact. It could be harmful or fatal if swallowed. More information is available below.

  • Inhalation: If inhaled, the victim must be moved into fresh air as soon as possible. Artificial respiration must be provided if needed, and medical attention should be sought if irritation symptoms persist or more arises.
  • Ingestion: If swallowed, immediate medical attention should be sought. Vomiting should never be induced but if it unwillingly happens, the victim’s head should be posed below the hips to prevent aspiration into the lungs.
  • Eye: leave the eyes wide open and wash them with plenty of water for at least 15 minutes. Hold the eyelids open, using the help of someone if needed. Ask for medical attention meanwhile, especially if the irritation persists.
  • Skin: Wash the area that had contact thoroughly with soap and water and remove all contaminated clothing (also wash it normally before using again). If any symptoms persist or arise, seek medical attention. 
  • Common Symptoms and effects: It could cause allergic skin reactions. If inhaled, can cause irritation, headaches, dizziness, nausea, and vomiting. If it reaches the lungs somehow it might damage them.

Aerokroil Flammability

According to the fabricant:

“Kroil is flammable and should never be used around an open flame. Similarly, do not apply heat immediately after an item has been sprayed with Kroil or any other chemical.”

Aerokroil is made from petroleum distillates, which are flammable. The propellant used in the product is carbon dioxide, which is not flammable. Even so, the petroleum distillates are carried by the propellant, so the spray is very flammable.


Aerokroil is a penetrating lube that helps dissolve rusty parts of metals. Since it’s a spray, it can creep under tiny spaces, where the petroleum solvents act rapidly. It can also leave a small oily film that prevents future oxidation. 

Because it has many petroleum constituents it is very flammable. Being a spray only makes burnable molecules even more willing to react with oxygen and start a fire, so precautions are needed.

The product also has toxic constituents, it can be harmful or even fatal if ingested. 

Frequent Asked Questions (FAQS): Is Aerokroil Flammable?

Is Kroil flammable?

Yes. It shouldn’t be used anywhere near a source of fire or heat. Safety measures should be taken into account according to the label.

Is Aerokroil toxic?

Yes. Its vapors are toxic and could lead to death if inhaled even once. If swallowed, get immediate medical attention.

Does Aerokroil prevent rust?

It does prevent rust. After the spray dries a lubricant film is formed, which can help as a protective barrier against oxidation.

Is Aerokroil the same as WD-40?

They do have some similarities, but each product has its uses. Aerokroil is a better penetrant, it looks like its oils are lighter which allows it to creep under small openings.

Can Aerokroil be used as a lubricant?

It can act as a lubricant as well, but its anti-rust and parts loosening properties are its main functions.


SAUNDERS, Keith J. Organic polymer chemistry: an introduction to the organic chemistry of adhesives, fibers, paints, plastics and rubbers. Springer Science & Business Media, 2012.

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