A vacuum draws product up from a bag or chamber as you press; no dip tube sucking from the bottom. That is why it wastes less and stays cleaner.
The two mechanisms inside an airless pump
Most airless bottles fall into one of two families. A piston system pushes product up from a moving plate at the base as you press the actuator; a bag system keeps the formula inside a soft inner pouch that collapses as it empties. Neither uses a dip tube, which is the whole point — nothing is left stranded at the bottom.
Because no air replaces the dispensed product, the formula inside stays sealed from oxygen. That is why airless is the default choice for oxidation-prone actives and preservative-lean (“clean”) formulas.
Dose control and priming: what buyers should know
Airless pumps dispense a consistent, metered dose (typically 0.25–0.5 ml per stroke for cosmetic sizes), which helps customers use the right amount and stretches the product. The trade-off is priming: an airless pump needs several initial strokes to build the vacuum before product appears, so filling lines must prime each unit or ship with instructions.
Specify the desired dose per stroke, the neck finish (e.g. 24/410 or 18/410), and the viscosity range of your formula — the pump engine is matched to those three numbers.
Quick answer
A vacuum draws product up from a bag or chamber as you press; no dip tube sucking from the bottom. That is why it wastes less and stays cleaner.
Related: cosmetic bottles.
Compliance note: For cosmetics, materials and decoration must stay compliant. Shijin bottles and inks meet FDA cosmetic requirements and the EU Cosmetics Regulation (EC 1223/2009), under ISO 9001:2015 quality management.
Frequently Asked Questions
How does an airless pump bottle work?
A vacuum draws product up from a bag or chamber as you press; no dip tube sucking from the bottom. That is why it wastes less and stays cleaner.
Why does my airless pump need priming?
The vacuum inside the chamber has to build before product lifts, so the first several strokes are empty. Filling lines can pre-prime units to avoid customer confusion.
What neck finishes do airless pumps use?
Cosmetic airless pumps most commonly use 18/410 or 24/410 neck finishes, but the exact size depends on your bottle and the pump engine.
Explore our full bottle catalog or contact our team for custom tooling and low-MOQ production runs.
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