Propylene glycol (PG) is a colorless,
odorless, and tasteless organic compound with the chemical formula C3H8O2. It
is a viscous liquid with a wide range of applications across various
industries, including food, pharmaceuticals, cosmetics, and automotive.
Here are some key details about propylene glycol along with its CAS number:
- Chemical formula: C3H8O2
- Molecular weight: Approximately 76.09 g/mol
- CAS Number: 57-55-6
- Appearance: Clear, colorless liquid
- Odor: Odorless
- Melting point: Approximately -59°C (-74°F)
- Boiling point: Approximately 188.2°C
(370.8°F) at 760 mmHg
- Density: Approximately 1.036 g/cm³
Propylene glycol is widely used for its properties as a:
1. Humectant: It has hygroscopic properties, meaning it attracts and retains moisture, making it a common ingredient in moisturizers, lotions, and other skincare products.
2. Solvent: Propylene glycol serves as a solvent for many substances, including flavors, colors, and active ingredients in pharmaceuticals.
3. Antifreeze: Due to its low toxicity and
ability to lower the freezing point of water, propylene glycol is used as an
antifreeze agent in automotive coolant and de-icing solutions.
4. Heat transfer fluid: It is used as a heat transfer fluid in various industrial applications, such as HVAC systems, refrigeration units, and thermal management systems.
5. Food additive: Propylene glycol is classified as Generally Recognized as Safe (GRAS) by the U.S. Food and Drug Administration (FDA) and is commonly used as a food additive, especially in processed foods, beverages, and food coloring.
6. Carrier fluid: It is used as a carrier fluid in the formulation of fragrances and flavors for use in perfumes, cosmetics, and food products.
Propylene glycol is generally considered safe for use in these applications, but like any chemical, it should be handled with care and in accordance with safety guidelines. It is important to note that while propylene glycol is generally safe, it can be toxic to pets if ingested in large quantities.
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