Is propylene glycol fire resistant?

This blog post will answer the question, “Is propylene glycol fire resistant” and cover topics like fire-resistant properties of propylene glycol and frequently asked questions related to the topic.

Is propylene glycol fire resistant?

No, propylene glycol is not fire-resistant. It is a very flammable liquid. It is not a dangerous chemical, as per OSHA Hazard Communication. Keep it away from open fires, flames, and heat.

What Is Propylene Glycol?

Propylene glycol is water-absorbing alcohol that combines well with a variety of solvents. While propylene glycol is classified as an organic chemical, it is not a naturally occurring substance. Instead, the word organic compound refers to the presence of carbon.

Propylene glycol, although a liquid, may turn into vapor in the atmosphere when heated or agitated violently.

The US Food and Drug Administration considers propylene glycol to be generally safe and non-toxic (FDA).

Composition of propylene glycol

Propylene glycol may be manufactured in two methods. It’s mostly manufactured by mixing water with propylene oxide, a chemical obtained from petroleum refining.

Glycerol, a primary side product of the biodiesel synthesis process, may also be used to make propylene glycol. This type of propylene glycol is mostly utilized in the manufacturing of plastics and antifreeze.

Glycol: Is It A Flammable Liquid?

Yes, glycol is flammable. Glycol is an organic molecule that belongs to the alcohol family. In the presence of oxygen, however, it is flammable. It’s a water-miscible antifreeze that’s often used for cooling and heat transmission.

It also has a low freezing point, giving it an advantage in the pharmaceutical, cosmetics, and food sectors as a medium. This keeps the items at the right temperature and regulates their moisture content.

I’d also want to point out that, despite the lack of a warning, ethylene glycol is a dangerous substance. It is poisonous and should only be consumed in a medical emergency.

Propylene glycol, on the other hand, is used in preservatives and beauty products. As a solvent, ethylene glycol is blended with ink and resins.

What Is Propylene Glycol’s Flash Point?

Propylene glycol has a flashpoint of 101°C (213.8°F). This liquid is similarly odorless, colorless, and viscous. It is only utilized in the industrial sector.

This is used to make polymers and is also used as an additive in the food sector. It is frequently used as an oral and topical medicine in pharmacology. It’s also sometimes utilized in intravenous formulations. It is also quite popular in the cosmetics business.

What Is The Distinction Between Propylene Glycol And Ethylene Glycol?

To begin, you must understand that glycol (an organic chemical component) is divided into two types: propylene glycol and ethylene glycol.

Here are some distinctions between the two:

  • Toxic – Propylene glycol is non-toxic, which is why it’s used in beauty products. Ethylene glycol, on the other hand, is hazardous, thus it must be treated with caution when animals and people are around.
  • Properties – Propylene glycol is more viscous and has a greater freezing point than ethylene glycol. At lower temps, ethylene glycol has shown to be beneficial. It is less costly than propylene glycol once again.
  • Application – It goes without saying that ethylene glycol is utilized in locations where efficiency is important. Plastic molding and ice rinks with less human and animal touch are examples. It is a common component used in antifreeze for automobiles.

Propylene glycol is utilized in areas with high human and animal exposure. Food, medications, and HVAC in houses, companies, and schools are examples.

If you’re unsure which one to choose for your field of business, think long and hard about it. Thermal efficiency, toxic effect, application, and, most significantly, the cost must all be considered.

This will undoubtedly bring you to the correct compound, which you will be able to transport, store, and handle with ease.

At What Temperature Propylene Glycol Burns?

It burns when temp exceeds 100 degrees centigrade. Propylene glycol is a flammable substance, as I previously said. As a result, open fires, heat, and sparks must be avoided. For the time being, it is all you need to remember.

Nonetheless, you should be warned that this might cause eye discomfort. This is because highly aerosolized compounds often induce throat and nasal irritation. When working with such a powerful substance, you must exercise extreme caution.

Uses of propylene glycol

Propylene glycol is utilized in a wide range of goods and procedures. A few uses of propylene glycol are listed below:

  • Pharmaceuticals
  • Food
  • Cosmetics
  • Antifreeze

I will now elaborate on the guidance given above.


Propylene glycol is a common solvent in the pharmaceutical industry. It’s used to dissolve other compounds (typically solids) without affecting their essential structure or content.

Propylene glycol is also employed in medicinal formulations as a carrier. It may be used to manufacture active substances and transport them to the body. Finally, it is used in the diluting and stabilization of pharmaceuticals.

Propylene glycol may be found in a variety of pharmaceuticals, including capsules and pills, topical creams and balms, and intravenous (injected) medications.


Propylene glycol is widely used in food and is usually regarded as safe. Propylene glycol is swiftly broken down in the body after consumption (within 48 hours) and converted to energy.

Propylene glycol is utilized in food in a variety of ways, including:

  • As an anti-clumping agent, preventing the formation of lumps in food
  • As a solvent in food flavoring agents, assisting in the dissolving and mixing of components.
  • As a dough conditioner.
  • To enhance the taste of meals.
  • Its antibacterial capabilities aid in the killing and/or prevention of microorganisms such as bacteria and mold as a preservative.
  • As a thickening agent for food.
  • To aid in the preservation of food moisture.


Propylene glycol is a frequent component in skincare, cosmetics, and personal care products. Between 26.4 percent and 37.8 percent of registered cosmeceuticals include it. 

Propylene glycol is a versatile chemical that serves a variety of roles in the products it is used in. These are some of the functions:

  • Humectant: Humectants are moisturizing agents found in cosmetics and skincare products. Propylene glycol acts as a humectant, drawing moisture to the skin and moisturizing and hydrating it as a result.
  • Solvent: Propylene glycol is used to dissolve ingredients in a product formulation so that they may properly combine and operate together. It also serves as a vehicle for the active components.
  • Emollients are substances that moisturize and soothe the skin. They’re great for treating dry skin in skincare products. Because it produces an oily film on the skin and reduces water loss, propylene glycol is used as an emollient.
  • Viscosity control: Propylene glycol is used to make cosmetic formulas and products thinner. This enhances how effectively the products move throughout the skin and how well they are absorbed.
  • Preservative: Porpelyne glycol is frequently used in cosmetic and skincare products as a preservative in conjunction with other substances.


Propylene glycol works as an antifreeze because it lowers the freezing point of water and water-based liquids. Propylene glycol is a major component in airplane deicers and is also used to break up ice on airport runways.

Propylene glycol is commonly used as a coolant in food manufacturing systems and in water mains that lead to interconnecting hoses since it is non-toxic.

Is It Safe To Smoke Propylene Glycol?

Propylene glycol has been an active element in cigarette tobacco for about 70 years, which may surprise you. As a result, it has been determined that it is appropriate for inhalation, oral administration, and topical application.

When you have a powerful chemical on hand, not knowing what to do might be harmful. As a result, if you use propylene glycol on a regular basis, being familiar with the liquid may be necessary.

What Happens When Propylene Glycol Is Burned?

The hydrocarbons in glycerin and propylene glycol are partly oxidized when propylene glycol is burned. Carbon dioxide and water will result if you continue to burn them. Yes, the answer is straightforward!

I strongly advise you to investigate what I’ve stated or will say in this post. Pay close attention to the safety aspect and work carefully.

Is Polyethylene Glycol a Combustible Material?

Yes, it is combustible. Once you come into touch with it, please remove your contaminated garments immediately. If you’ve inhaled it, go outside and breathe some fresh air. If you’re not feeling well, visit a doctor.

If it comes into touch with your skin, wipe it off as soon as possible. I would also recommend splashing water into your eyes. If you have consumed anything, rinse your mouth with water and get medical attention as soon as possible.

Is Propylene Glycol Safe to Heat?

It is not safe to heat propylene glycol. If the truth is known, I have to tell you that heating propylene glycol might result in a different composition. Propylene oxide, a well-known carcinogen, is likely to be produced as a result of this heating.

Isn’t it true that we’d all want to live somewhere else? In addition, the FDA (Food and Drug Administration) has allowed the use of propylene glycol in some goods. Nonetheless, they have never said that inhalation is safe.

Frequently Asked Questions(FAQs), “Is propylene glycol fire resistant?”

What makes propylene glycol and ethylene glycol different?

Ethylene glycol and propylene glycol are the two most common glycols. The most significant distinction between the two glycols is that ethylene glycol is hazardous, but propylene glycol is not, enabling propylene glycol to be obtained in both food and technical or industrial grades.

Is it possible to get intoxicated by propylene glycol?

Propylene glycol is a frequent solvent in pharmaceutical formulations for oral, intravenous, and topical administration. Large intravenous dosages administered over a short period may be harmful, even if they are deemed safe. Renal failure and hepatic dysfunction increase the risk of toxicity.

Is it safe to breathe glycol?

Ethylene glycol may cause breathing issues, cardiac problems, renal failure, and brain damage if breathed in large amounts. Inhaling antifreeze vapors might be particularly dangerous for those with pre-existing medical issues.

Is it possible to heat propylene glycol?

Glycols that have been adequately inhibited may be used at temperatures as high as 350°F. Regular inhibited glycols can withstand temperatures up to 250°F. Glycols break down rapidly at temperatures over 250°F, generating acid molecules. Glycol may be utilized at high temperatures with correct buffering and corrosion inhibitors.

What can I do with propylene glycol?

It’s used to absorb excess moisture to keep medications, cosmetics, and food goods wet. It’s used as a solvent for culinary colors and tastes, as well as paint and plastics. Propylene glycol is often utilized in firefighting training and theatrical shows to generate fake smoke or fog.

At room temperature, is ethylene glycol flammable?

It can be flammable. Excessive inhalation At room temp, exposure does not occur, but when the liquid is heated, stirred, or sprayed, it may cause respiratory tract discomfort. Ethylene glycol is a sweet-tasting, colorless, odorless liquid with a minor viscosity. It has a low vapor pressure and is flammable.

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