Airless bottles help to protect skincare and other personal care formulas from exposure to oxygen.
The bottle is usually injection molded from polypropylene, to ensure straight and consistent wall dimensions. Polypropylene also provides the highest oxygen barrier to protect the product.
The most common type of airless bottle holds a piston, sometimes called a disc, which uses suction to create a vacuum chamber against the walls of the bottle. When the pump is depressed, the piston uniformly dispenses formula, but does not allow air back into the formula.
There will be a small hole in the base of the airless bottle, below the piston. When the formula is pumped, air is allowed in through the bottle’s base, pushing the piston upwards as the formula stays airtight within the pump chamber.
In instances where the customer wants to dispense a very small quantity of the product (like medical ointments, face moisturizers or night creams), airless bottles allow for a high level of precision, ensuring the exact quantity is dispensed with every use.