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There are a number of reasons to use an airless solution. Some are technical, some are aesthetic. Here's our own top five list:
1. No propellant required
This may not sound like much, but it's a pretty big deal environmentally speaking. Many early propellants were CFCs (chlorofluorocarbons), due to be phased out completely by 2020 according to the Montreal agreement, signed by 200 nations. The effects of all propellants currently used is not exactly known, however.
2. More accurate dosing
The stroke of the pump does not need to extract more or less product due to the depth of depression. One stroke of the airless dispensing actuator can be set to dispense an exact amount of product, making it easier to use for treatments that need to last a certain period of time, which correct dosing can regulate.
3. Less chemical interaction
There are many gasses in our atmosphere, and products tend to react in one way or another to those environmental components. Oxygen, especially, can accelerate product decay through oxidation (when a substance loses electrons due to an oxidizing agent - oxygen is, of course, at the top of the list). Our air contains more than just oxygen, though. In order of percentage, the air we breath is mostly nitrogen, followed by oxygen, argon, carbon dioxide, neon, helium, methane, krypton, hydrogen, nitrous oxide, carbon monoxide, xenon, ozone, nitrogen dioxide, iodine, and traces of ammonia. Thoseare a lot of substances that even in small amounts can affect a product that is most potent when in a vacuum. In an airless package, the product only interacts with air when it is dispensed, and even then the time between exposure and application is limited. So, products contained in an airless package tend to last longer on the shelf and to stay aesthetically pristine longer, as they don't suffer much discolouring due to oxidation. Many sensitive formulations especially benefit from this lack of interaction, and not only last much longer when compared with a standard pump system, they also retain their properties and efficacy.
4. No pressurization
When packaged, airless packaging can be set to be at equilibrium with the exterior atmosphere, it doesn't require added internal pressure to push a product out. The addition of pressure comes during actuation, when the customer depresses the actuator. Hence, airless packaging isn't shipped with added internal pressure, which can climb if transported at higher altitudes or when heated. Airless packaging, then, offers an intrinsic safety feature.
5. Easy to use
It may be a small thing, but one of the things most enjoyed by consumers is the ease of use that airless packaging offers. Regardless of the position of the product during dispensing, the system will evacuate the product effectively. Standard pumps that use dip tubes require the product to be right side up, as the product feeds into the tube from the bottom of the reservoir. Since an airless solution evacuates from the top, most can be dispensed at an angle or completely upside down, even when most of the product has already exited.
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