Aerosols can be defined as tiny solid particles or tiny liquid droplets, in the atmosphere. The solid aerosol particles can be placed in atmosphere, more specifically by volcanic eruptions, dust storms, and emission of soot particles by large fires.

Liquid aerosols hold water contents, which may also include chemical species. The wave action in the ocean may cause water droplets and small sea salt particles into atmosphere.

In more simpler terms, aerosol is a substance enclosed under pressure and released through a propellant gas as a fine spray. These are widely utilized in cosmetics such as deodorant, sprays, foaming agents, sprays, and sunscreens.

These are also utilized in healthcare sector, usually in products such as anesthetic preparation, inhalers, and disinfectants.

They can also be found in household items such as air fresheners, car cosmetics, cleaning agents, varnishes, and paints. They also have a massive industrial application for maintenance of relevant products.

Components of Aerosol

An aerosol canister usually includes complex piece of machinery for steady delivery of the concentrated stream of the product filled inside it. The components of aerosol are propellant, aerosol container, product concentrate, valve and actuator.

Aerosol propellants support the pressure intensification inside the aerosol container, as when valve opens, it ejects the product and helps in expelling the product via contents’ automization or foam production.

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Types of Aerosol Propellants

Liquified Gas Propellant: The liquified gas is used as a propellant in excessive pressure where propellant turns out be in liquid state, and at headspace, it remains in gaseous form. When container’s valve is opened, few liquid propellants convert into gas, while the pressure inside the container remains unchanged. The liquid propellant supports in dissolvable solvent blending, such as CFC, and LPG.

Compressed Gas Propellant: In an aerosol tin, the compact gas fuels capture the upper headspace over the fluid. With the opening of the aerosol valve, the gas fuels the movement of the fluid outside the can. The amount of gas remains constant in the headspace. On using it, the gas gets escape from can due to lower pressure.

Aerosol containers are primarily made of metals, glass, and plastics, depending on the characteristics and behaviour of solvent and propellants to be stored inside it.

The aluminium canister is manufactured with bottom and center areas as one unit. Its covering is connected to the internal surface. It offers high erosion protection from fluid concentration.

Glass containers for aerosol packaging are quite delicate. They are usually utilized for those products that have lesser pressure and lower propellants rates.

The plastic containers are permeable to vapors and atmospheric air, and interacts with the formulation. It may also cause oxidative degradation of formulation. Plastic as an aerosol packaging material is cheap, ductile, and malleable.

Therefore, the rising healthcare, cosmetic, and industrial application of aerosols drives the revenue to the industry.