Product Information

CAS Number:


Chemical and physical data

Formula : C3H8O2

Molar Mass: 76.09 g·mol−1

Density : 1.036 g/cm3

Melting point : -59 °C

Boiling point : 188.2 °C

 Other Names

Methylene Glycol
Methyl Glycol
Methyl Ethyl Glycol (MEG)
Propylene Glycol ** DO NOT USE **
Propylene Glycol
Isopropylene glycol
Diazolidinyl Urea & Parabens In Propylene Glycol
1,2-Propanediol, 33% Solution
Methylethylene Glycol
Defoamer - Foam Ban 2901
1,2-Propylene glycol
Monopropylene Glycol


What Is Monopropylene Glycol?

Mono propylene glycol (also known as propylene glycol, propylene glycol mono, PG, propan1 and MPG) is a clear, colourless and viscous liquid with a characteristic odour and has the formula C3H8O. This solvent is soluble in water, meaning it has the ability to attract hard water molecules. It is used across a wide range of industries as it has low toxicity, coupled with a freezing point which is depressed upon mixing with water.

Is Monopropylene glycol the same as Propylene glycol?

Yes, PG (Propylene Glycol) is just another name for MPG (Monopropylene Glycol) so it is exactly the same chemical.

Characteristics propylene glycol

Acts as a solvent.

Connects and stabilizes insoluble liquids. (Emulsifier)

Helps to connect and transport other materials. (excipient)

Holds and dissolves active ingredients evenly in one environment.

Absorbs and retains water and moisture.

Reduces the freezing point.

Increases the boiling point.

Offers extraordinary stability with high strengths and boils.

How can propylene glycol affect my health?

Propylene glycol breaks down at the same rate as ethylene glycol, although it does not form harmful crystals when it breaks down. Frequent skin exposure to propylene glycol can sometimes irritate the skin.

What happens to propylene glycol when it enters the environment?

Propylene glycol can enter the environment when it is used as a runway and aircraft de-icing agent. Propylene glycol can also enter the environment through the disposal of products that contains it. It is not likely to exist in large amounts in the air. We have little information about what happens to propylene glycol in the air. The small amounts that may enter the air are likely to break down quickly. If it escapes into the air, it will take between 24 and 50 hours for half the amount released to break down. Propylene glycol can mix completely with water and can soak into soil. It can break down relatively quickly (within several days to a week) in surface water and in soil. Propylene glycol can also travel from certain types of food packages into the food in the package.

The chemical facts about propylene glycol

• It is water-soluble.

• It is synthetic.

• It is non-toxic.

• It is easily metabolized. 

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Why is propylene glycol used in food?

Propylene glycol is often used to maintain the moisture in prepared foods and works to maintain their flavor quality for longer periods of time. It is also found in flavorings, such as vanilla or almond extracts used in baking, and in some types of food coloring.

Is propylene glycol safe?

Yes, propylene glycol can be safely consumed. The US Food and Drug Administration (FDA) and FAO/WHO Joint Expert Committee on Food Additives have reviewed scientific research on the safety of propylene glycol to ensure that it is safe for its intended uses in food. 

How is propylene glycol regulated in food?

Propylene glycol is regulated by the FDA to ensure its safe use and consumption. FDA sets limits on the uses and amounts propylene glycol, and other ingredients that can be used in foods and beverages, to ensure safety.

Is Propylene Glycol in Food Dangerous?

Propylene glycol is “generally recognized as safe” (GRAS) by the US Food and Drug Administration (FDA).
In the US, it can be used as a direct and indirect food additive.In Europe, it is only allowed to be used in food as a solvent for colors, emulsifiers, antioxidants and enzymes, with up to 0.45 grams per pound (1 gram/kg) allowed in the final food product.

The World Health Organization recommends a maximum intake of 11.4 mg of propylene glycol per pound of body weight (25 mg/kg) per day. The estimated exposure to propylene glycol through foods in the US is 15 mg per pound (34 mg/kg) per day.
Overall, apart from people with allergies and one case of excessive consumption, there have been no other reported cases of negative or toxic effects of propylene glycol in foods.
However, as current intakes are estimated to be above the recommended level, it may be wise to reduce dietary sources where you can, especially as the primary sources are highly processed foods.

What is Mono Propylene Glycol used for?

There are a wide range of uses for MPG across a variety of different industries including use in agriculture, cosmetics, coolants, de-icers, e-cigarette and vape products, pharmaceutical, personal care and in the production of a number of end products including paints and inks.

Mono Propylene Glycol in animal feed:

Monopropylene glycol works to assist in the formulation of glucose to rebalance negative energy in dairy carrel. MPG serves as a readily available energy source in ketosis treatment and prevention and has an energy value of 23.6 Mj/Kg

Mono Propylene Glycol in vape juice:

Mono Propylene Glycol USP is used in vape juice as a carrier, effectively transporting more flavour in your vape than vegetable glycerine (VG) .

Mono Propylene Glycol in cosmetics and personal care products :

Monopropylene glycol USP is widely used in most cosmetic and personal care products including moisturisers, shampoos, shower gels, fragrances and soaps. Because of its hygroscopic properties it retains moisture therefore enhancing the appearance of skin. In perfumes it carries fragrance and, as an odourless and colourless chemical it is used as a diluent.

How does Propylene glycol produse?

Industrially, propylene glycol is mainly produced from propylene oxide (for food-grade use). According to a 2018 source, 2.16 M tonnes are produced annually. Manufacturers use either non-catalytic high-temperature process at 200 °C, or a catalytic method, which proceeds at 150 °C  in the presence of ion exchange resin or a small amount of sulfuric acid or alkali.

Final products contain 20% propylene glycol, 1.5% of dipropylene glycol, and small amounts of other polypropylene glycols. Further purification produces finished industrial grades.

Propylene glycol can also be obtained from glycerol, a byproduct from the production of biodiesel. This starting material is usually reserved for industrial use because of the noticeable odor and taste that accompanies the final product.

Consumption of propylene glycol

Propylene glycol is used professionally by manufacturers of consumer and industrial products, but it is not available to consumers as pure substance. Under normal conditions it is therefore impossible to ingest propylene glycol in large amounts, and consumer exposure to propylene glycol via products is extremely low. In addition, studies have shown that propylene glycol has a very low degree of toxicity.

How pure is pharmaceutical propylene glycol?

Propylene glycol USP/EP (pharmaceutical grade) has a very high purity (i.e. absence of impurities) of more than 99,5% – which is extremely high for a chemical. Most important, though, is respecting hygiene regulations and Good Manufacturing Practice standards in the production, transport and further processing of propylene glycol.

Monopropylene glycol in industry

As the aircraft defrosts, it provides safe air transport and ensures that the surfaces are flat for the aircraft to stay in the air.

- In paints and coatings, it protects paint and coatings against weather conditions and erosion.

- In liquid detergents, improves health conditions.

- Used as an excellent solvent in printing inks.

- In residential and commercial constructions, it is mainly used for the construction of building panels, bathroom components, appliances and tanks, pipes and corrosion-resistant ducts.

- In the production of pleasure boats, passenger cars and trucks as well as recreational equipment are the main construction materials.


What are the grades of monopropylene glycol?

This material has three different degrees, for a wide range of applications.

  1. Ultra-pure USP monopropylene glycol

 This grade of monopropylene glycol is used in the food, flavoring, pharmaceutical, cosmetic and e-cigarette industries.

  1. Technical grade of monopropylene glycol

This grade is commonly used in antifreeze products, coolants, defrosters, and as glycol chillers.

  1. Feed grade of monopropylene glycol

 This is a European MPG grade and is manufactured and registered under FEMAS (Feed Assurance Scheme) for use in animal feed applications.


Therefore, Monopropylene glycol is odorless and colorless, it has many physical and chemical properties and is used in many of our everyday products because it is safe and low in toxicity.


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